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) 1992-2015, 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    -- Back_End_Exceptions --
  43    -------------------------
  44
  45    function Back_End_Exceptions return Boolean is
  46    begin
  47       return
  48         Exception_Mechanism = Back_End_SJLJ
  49           or else
  50         Exception_Mechanism = Back_End_ZCX;
  51    end Back_End_Exceptions;
  52
  53    -------------------------
  54    -- Front_End_Exceptions --
  55    -------------------------
  56
  57    function Front_End_Exceptions return Boolean is
  58    begin
  59       return Exception_Mechanism = Front_End_SJLJ;
  60    end Front_End_Exceptions;
  61
  62    --------------------
  63    -- SJLJ_Exceptions --
  64    --------------------
  65
  66    function SJLJ_Exceptions return Boolean is
  67    begin
  68       return
  69         Exception_Mechanism = Back_End_SJLJ
  70           or else
  71         Exception_Mechanism = Front_End_SJLJ;
  72    end SJLJ_Exceptions;
  73
  74    --------------------
  75    -- ZCX_Exceptions --
  76    --------------------
  77
  78    function ZCX_Exceptions return Boolean is
  79    begin
  80       return Exception_Mechanism = Back_End_ZCX;
  81    end ZCX_Exceptions;
  82
  83    ----------------------------------
  84    -- Register_Opt_Config_Switches --
  85    ----------------------------------
  86
  87    procedure Register_Opt_Config_Switches is
  88    begin
  89       Ada_Version_Config                    := Ada_Version;
  90       Ada_Version_Pragma_Config             := Ada_Version_Pragma;
  91       Ada_Version_Explicit_Config           := Ada_Version_Explicit;
  92       Assertions_Enabled_Config             := Assertions_Enabled;
  93       Assume_No_Invalid_Values_Config       := Assume_No_Invalid_Values;
  94       Check_Float_Overflow_Config           := Check_Float_Overflow;
  95       Check_Policy_List_Config              := Check_Policy_List;
  96       Default_Pool_Config                   := Default_Pool;
  97       Default_SSO_Config                    := Default_SSO;
  98       Dynamic_Elaboration_Checks_Config     := Dynamic_Elaboration_Checks;
  99       Exception_Locations_Suppressed_Config := Exception_Locations_Suppressed;
 100       Extensions_Allowed_Config             := Extensions_Allowed;
 101       External_Name_Exp_Casing_Config       := External_Name_Exp_Casing;
 102       External_Name_Imp_Casing_Config       := External_Name_Imp_Casing;
 103       Fast_Math_Config                      := Fast_Math;
 104       Initialize_Scalars_Config             := Initialize_Scalars;
 105       Optimize_Alignment_Config             := Optimize_Alignment;
 106       Persistent_BSS_Mode_Config            := Persistent_BSS_Mode;
 107       Polling_Required_Config               := Polling_Required;
 108       Prefix_Exception_Messages_Config      := Prefix_Exception_Messages;
 109       SPARK_Mode_Config                     := SPARK_Mode;
 110       SPARK_Mode_Pragma_Config              := SPARK_Mode_Pragma;
 111       Uneval_Old_Config                     := Uneval_Old;
 112       Use_VADS_Size_Config                  := Use_VADS_Size;
 113       Warnings_As_Errors_Count_Config       := Warnings_As_Errors_Count;
 114
 115       --  Reset the indication that Optimize_Alignment was set locally, since
 116       --  if we had a pragma in the config file, it would set this flag True,
 117       --  but that's not a local setting.
 118
 119       Optimize_Alignment_Local := False;
 120    end Register_Opt_Config_Switches;
 121
 122    ---------------------------------
 123    -- Restore_Opt_Config_Switches --
 124    ---------------------------------
 125
 126    procedure Restore_Opt_Config_Switches (Save : Config_Switches_Type) is
 127    begin
 128       Ada_Version                    := Save.Ada_Version;
 129       Ada_Version_Pragma             := Save.Ada_Version_Pragma;
 130       Ada_Version_Explicit           := Save.Ada_Version_Explicit;
 131       Assertions_Enabled             := Save.Assertions_Enabled;
 132       Assume_No_Invalid_Values       := Save.Assume_No_Invalid_Values;
 133       Check_Float_Overflow           := Save.Check_Float_Overflow;
 134       Check_Policy_List              := Save.Check_Policy_List;
 135       Default_Pool                   := Save.Default_Pool;
 136       Default_SSO                    := Save.Default_SSO;
 137       Dynamic_Elaboration_Checks     := Save.Dynamic_Elaboration_Checks;
 138       Exception_Locations_Suppressed := Save.Exception_Locations_Suppressed;
 139       Extensions_Allowed             := Save.Extensions_Allowed;
 140       External_Name_Exp_Casing       := Save.External_Name_Exp_Casing;
 141       External_Name_Imp_Casing       := Save.External_Name_Imp_Casing;
 142       Fast_Math                      := Save.Fast_Math;
 143       Initialize_Scalars             := Save.Initialize_Scalars;
 144       Optimize_Alignment             := Save.Optimize_Alignment;
 145       Optimize_Alignment_Local       := Save.Optimize_Alignment_Local;
 146       Persistent_BSS_Mode            := Save.Persistent_BSS_Mode;
 147       Polling_Required               := Save.Polling_Required;
 148       Prefix_Exception_Messages      := Save.Prefix_Exception_Messages;
 149       SPARK_Mode                     := Save.SPARK_Mode;
 150       SPARK_Mode_Pragma              := Save.SPARK_Mode_Pragma;
 151       Uneval_Old                     := Save.Uneval_Old;
 152       Use_VADS_Size                  := Save.Use_VADS_Size;
 153       Warnings_As_Errors_Count       := Save.Warnings_As_Errors_Count;
 154
 155       --  Update consistently the value of Init_Or_Norm_Scalars. The value of
 156       --  Normalize_Scalars is not saved/restored because after set to True its
 157       --  value is never changed. That is, if a compilation unit has pragma
 158       --  Normalize_Scalars then it forces that value for all with'ed units.
 159
 160       Init_Or_Norm_Scalars := Initialize_Scalars or Normalize_Scalars;
 161    end Restore_Opt_Config_Switches;
 162
 163    ------------------------------
 164    -- Save_Opt_Config_Switches --
 165    ------------------------------
 166
 167    procedure Save_Opt_Config_Switches (Save : out Config_Switches_Type) is
 168    begin
 169       Save.Ada_Version                    := Ada_Version;
 170       Save.Ada_Version_Pragma             := Ada_Version_Pragma;
 171       Save.Ada_Version_Explicit           := Ada_Version_Explicit;
 172       Save.Assertions_Enabled             := Assertions_Enabled;
 173       Save.Assume_No_Invalid_Values       := Assume_No_Invalid_Values;
 174       Save.Check_Float_Overflow           := Check_Float_Overflow;
 175       Save.Check_Policy_List              := Check_Policy_List;
 176       Save.Default_Pool                   := Default_Pool;
 177       Save.Default_SSO                    := Default_SSO;
 178       Save.Dynamic_Elaboration_Checks     := Dynamic_Elaboration_Checks;
 179       Save.Exception_Locations_Suppressed := Exception_Locations_Suppressed;
 180       Save.Extensions_Allowed             := Extensions_Allowed;
 181       Save.External_Name_Exp_Casing       := External_Name_Exp_Casing;
 182       Save.External_Name_Imp_Casing       := External_Name_Imp_Casing;
 183       Save.Fast_Math                      := Fast_Math;
 184       Save.Initialize_Scalars             := Initialize_Scalars;
 185       Save.Optimize_Alignment             := Optimize_Alignment;
 186       Save.Optimize_Alignment_Local       := Optimize_Alignment_Local;
 187       Save.Persistent_BSS_Mode            := Persistent_BSS_Mode;
 188       Save.Polling_Required               := Polling_Required;
 189       Save.Prefix_Exception_Messages      := Prefix_Exception_Messages;
 190       Save.SPARK_Mode                     := SPARK_Mode;
 191       Save.SPARK_Mode_Pragma              := SPARK_Mode_Pragma;
 192       Save.Uneval_Old                     := Uneval_Old;
 193       Save.Use_VADS_Size                  := Use_VADS_Size;
 194       Save.Warnings_As_Errors_Count       := Warnings_As_Errors_Count;
 195    end Save_Opt_Config_Switches;
 196
 197    -----------------------------
 198    -- Set_Opt_Config_Switches --
 199    -----------------------------
 200
 201    procedure Set_Opt_Config_Switches
 202      (Internal_Unit : Boolean;
 203       Main_Unit     : Boolean)
 204    is
 205    begin
 206       --  Case of internal unit
 207
 208       if Internal_Unit then
 209
 210          --  Set standard switches. Note we do NOT set Ada_Version_Explicit
 211          --  since the whole point of this is that it still properly indicates
 212          --  the configuration setting even in a run time unit.
 213
 214          Ada_Version                 := Ada_Version_Runtime;
 215          Ada_Version_Pragma          := Empty;
 216          Default_SSO                 := ' ';
 217          Dynamic_Elaboration_Checks  := False;
 218          Extensions_Allowed          := True;
 219          External_Name_Exp_Casing    := As_Is;
 220          External_Name_Imp_Casing    := Lowercase;
 221          Optimize_Alignment          := 'O';
 222          Persistent_BSS_Mode         := False;
 223          Prefix_Exception_Messages   := True;
 224          Uneval_Old                  := 'E';
 225          Use_VADS_Size               := False;
 226          Optimize_Alignment_Local    := True;
 227
 228          --  Note: we do not need to worry about Warnings_As_Errors_Count since
 229          --  we do not expect to get any warnings from compiling such a unit.
 230
 231          --  For an internal unit, assertions/debug pragmas are off unless this
 232          --  is the main unit and they were explicitly enabled, or unless the
 233          --  main unit was compiled in GNAT mode. We also make sure we do not
 234          --  assume that values are necessarily valid and that SPARK_Mode is
 235          --  set to its configuration value.
 236
 237          if Main_Unit then
 238             Assertions_Enabled       := Assertions_Enabled_Config;
 239             Assume_No_Invalid_Values := Assume_No_Invalid_Values_Config;
 240             Check_Policy_List        := Check_Policy_List_Config;
 241             SPARK_Mode               := SPARK_Mode_Config;
 242             SPARK_Mode_Pragma        := SPARK_Mode_Pragma_Config;
 243          else
 244             if GNAT_Mode_Config then
 245                Assertions_Enabled    := Assertions_Enabled_Config;
 246             else
 247                Assertions_Enabled    := False;
 248             end if;
 249             Assume_No_Invalid_Values := False;
 250             Check_Policy_List        := Empty;
 251             SPARK_Mode               := None;
 252             SPARK_Mode_Pragma        := Empty;
 253          end if;
 254
 255       --  Case of non-internal unit
 256
 257       else
 258          Ada_Version                 := Ada_Version_Config;
 259          Ada_Version_Pragma          := Ada_Version_Pragma_Config;
 260          Ada_Version_Explicit        := Ada_Version_Explicit_Config;
 261          Assertions_Enabled          := Assertions_Enabled_Config;
 262          Assume_No_Invalid_Values    := Assume_No_Invalid_Values_Config;
 263          Check_Float_Overflow        := Check_Float_Overflow_Config;
 264          Check_Policy_List           := Check_Policy_List_Config;
 265          Default_SSO                 := Default_SSO_Config;
 266          Dynamic_Elaboration_Checks  := Dynamic_Elaboration_Checks_Config;
 267          Extensions_Allowed          := Extensions_Allowed_Config;
 268          External_Name_Exp_Casing    := External_Name_Exp_Casing_Config;
 269          External_Name_Imp_Casing    := External_Name_Imp_Casing_Config;
 270          Fast_Math                   := Fast_Math_Config;
 271          Initialize_Scalars          := Initialize_Scalars_Config;
 272          Optimize_Alignment          := Optimize_Alignment_Config;
 273          Optimize_Alignment_Local    := False;
 274          Persistent_BSS_Mode         := Persistent_BSS_Mode_Config;
 275          Prefix_Exception_Messages   := Prefix_Exception_Messages_Config;
 276          SPARK_Mode                  := SPARK_Mode_Config;
 277          SPARK_Mode_Pragma           := SPARK_Mode_Pragma_Config;
 278          Uneval_Old                  := Uneval_Old_Config;
 279          Use_VADS_Size               := Use_VADS_Size_Config;
 280          Warnings_As_Errors_Count    := Warnings_As_Errors_Count_Config;
 281
 282          --  Update consistently the value of Init_Or_Norm_Scalars. The value
 283          --  of Normalize_Scalars is not saved/restored because once set to
 284          --  True its value is never changed. That is, if a compilation unit
 285          --  has pragma Normalize_Scalars then it forces that value for all
 286          --  with'ed units.
 287
 288          Init_Or_Norm_Scalars := Initialize_Scalars or Normalize_Scalars;
 289       end if;
 290
 291       --  Values set for all units
 292
 293       Default_Pool                   := Default_Pool_Config;
 294       Exception_Locations_Suppressed := Exception_Locations_Suppressed_Config;
 295       Fast_Math                      := Fast_Math_Config;
 296       Optimize_Alignment             := Optimize_Alignment_Config;
 297       Polling_Required               := Polling_Required_Config;
 298    end Set_Opt_Config_Switches;
 299
 300    ---------------
 301    -- Tree_Read --
 302    ---------------
 303
 304    procedure Tree_Read is
 305       Tree_Version_String_Len         : Nat;
 306       Ada_Version_Config_Val          : Nat;
 307       Ada_Version_Explicit_Config_Val : Nat;
 308       Assertions_Enabled_Config_Val   : Nat;
 309
 310    begin
 311       Tree_Read_Int  (Tree_ASIS_Version_Number);
 312
 313       Tree_Read_Bool (Address_Is_Private);
 314       Tree_Read_Bool (Brief_Output);
 315       Tree_Read_Bool (GNAT_Mode);
 316       Tree_Read_Char (Identifier_Character_Set);
 317       Tree_Read_Bool (Ignore_Rep_Clauses);
 318       Tree_Read_Bool (Ignore_Style_Checks_Pragmas);
 319       Tree_Read_Int  (Maximum_File_Name_Length);
 320       Tree_Read_Data (Suppress_Options'Address,
 321                       (Suppress_Options'Size + SU - 1) / SU);
 322       Tree_Read_Bool (Verbose_Mode);
 323       Tree_Read_Data (Warning_Mode'Address,
 324                       (Warning_Mode'Size + SU - 1) / SU);
 325       Tree_Read_Int  (Ada_Version_Config_Val);
 326       Tree_Read_Int  (Ada_Version_Explicit_Config_Val);
 327       Tree_Read_Int  (Assertions_Enabled_Config_Val);
 328       Tree_Read_Bool (All_Errors_Mode);
 329       Tree_Read_Bool (Assertions_Enabled);
 330       Tree_Read_Bool (Check_Float_Overflow);
 331       Tree_Read_Int  (Int (Check_Policy_List));
 332       Tree_Read_Int  (Int (Default_Pool));
 333       Tree_Read_Bool (Full_List);
 334
 335       Ada_Version_Config :=
 336         Ada_Version_Type'Val (Ada_Version_Config_Val);
 337       Ada_Version_Explicit_Config :=
 338         Ada_Version_Type'Val (Ada_Version_Explicit_Config_Val);
 339       Assertions_Enabled_Config :=
 340         Boolean'Val (Assertions_Enabled_Config_Val);
 341
 342       --  Read version string: we have to get the length first
 343
 344       Tree_Read_Int (Tree_Version_String_Len);
 345
 346       declare
 347          Tmp : String (1 .. Integer (Tree_Version_String_Len));
 348       begin
 349          Tree_Read_Data
 350            (Tmp'Address, Tree_Version_String_Len);
 351          System.Strings.Free (Tree_Version_String);
 352          Free (Tree_Version_String);
 353          Tree_Version_String := new String'(Tmp);
 354       end;
 355
 356       Tree_Read_Data (Distribution_Stub_Mode'Address,
 357                       (Distribution_Stub_Mode'Size + SU - 1) / Storage_Unit);
 358       Tree_Read_Bool (Inline_Active);
 359       Tree_Read_Bool (Inline_Processing_Required);
 360       Tree_Read_Bool (List_Units);
 361       Tree_Read_Int  (Multiple_Unit_Index);
 362       Tree_Read_Bool (Configurable_Run_Time_Mode);
 363       Tree_Read_Data (Operating_Mode'Address,
 364                       (Operating_Mode'Size + SU - 1) / Storage_Unit);
 365       Tree_Read_Bool (Suppress_Checks);
 366       Tree_Read_Bool (Try_Semantics);
 367       Tree_Read_Data (Wide_Character_Encoding_Method'Address,
 368                       (Wide_Character_Encoding_Method'Size + SU - 1) / SU);
 369       Tree_Read_Bool (Upper_Half_Encoding);
 370       Tree_Read_Bool (Force_ALI_Tree_File);
 371    end Tree_Read;
 372
 373    ----------------
 374    -- Tree_Write --
 375    ----------------
 376
 377    procedure Tree_Write is
 378       Version_String : String := Gnat_Version_String;
 379
 380    begin
 381       Tree_Write_Int  (ASIS_Version_Number);
 382
 383       Tree_Write_Bool (Address_Is_Private);
 384       Tree_Write_Bool (Brief_Output);
 385       Tree_Write_Bool (GNAT_Mode);
 386       Tree_Write_Char (Identifier_Character_Set);
 387       Tree_Write_Bool (Ignore_Rep_Clauses);
 388       Tree_Write_Bool (Ignore_Style_Checks_Pragmas);
 389       Tree_Write_Int  (Maximum_File_Name_Length);
 390       Tree_Write_Data (Suppress_Options'Address,
 391                        (Suppress_Options'Size + SU - 1) / SU);
 392       Tree_Write_Bool (Verbose_Mode);
 393       Tree_Write_Data (Warning_Mode'Address,
 394                        (Warning_Mode'Size + SU - 1) / Storage_Unit);
 395       Tree_Write_Int  (Ada_Version_Type'Pos (Ada_Version_Config));
 396       Tree_Write_Int  (Ada_Version_Type'Pos (Ada_Version_Explicit_Config));
 397       Tree_Write_Int  (Boolean'Pos (Assertions_Enabled_Config));
 398       Tree_Write_Bool (All_Errors_Mode);
 399       Tree_Write_Bool (Assertions_Enabled);
 400       Tree_Write_Bool (Check_Float_Overflow);
 401       Tree_Write_Int  (Int (Check_Policy_List));
 402       Tree_Write_Int  (Int (Default_Pool));
 403       Tree_Write_Bool (Full_List);
 404       Tree_Write_Int  (Int (Version_String'Length));
 405       Tree_Write_Data (Version_String'Address, Version_String'Length);
 406       Tree_Write_Data (Distribution_Stub_Mode'Address,
 407                        (Distribution_Stub_Mode'Size + SU - 1) / SU);
 408       Tree_Write_Bool (Inline_Active);
 409       Tree_Write_Bool (Inline_Processing_Required);
 410       Tree_Write_Bool (List_Units);
 411       Tree_Write_Int  (Multiple_Unit_Index);
 412       Tree_Write_Bool (Configurable_Run_Time_Mode);
 413       Tree_Write_Data (Operating_Mode'Address,
 414                        (Operating_Mode'Size + SU - 1) / SU);
 415       Tree_Write_Bool (Suppress_Checks);
 416       Tree_Write_Bool (Try_Semantics);
 417       Tree_Write_Data (Wide_Character_Encoding_Method'Address,
 418                        (Wide_Character_Encoding_Method'Size + SU - 1) / SU);
 419       Tree_Write_Bool (Upper_Half_Encoding);
 420       Tree_Write_Bool (Force_ALI_Tree_File);
 421    end Tree_Write;
 422
 423 end Opt;