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) 1992-2018, 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_Config_Switches --
  85    ------------------------------
  86
  87    procedure Register_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       No_Component_Reordering_Config        := No_Component_Reordering;
 106       Optimize_Alignment_Config             := Optimize_Alignment;
 107       Persistent_BSS_Mode_Config            := Persistent_BSS_Mode;
 108       Polling_Required_Config               := Polling_Required;
 109       Prefix_Exception_Messages_Config      := Prefix_Exception_Messages;
 110       SPARK_Mode_Config                     := SPARK_Mode;
 111       SPARK_Mode_Pragma_Config              := SPARK_Mode_Pragma;
 112       Uneval_Old_Config                     := Uneval_Old;
 113       Use_VADS_Size_Config                  := Use_VADS_Size;
 114       Warnings_As_Errors_Count_Config       := Warnings_As_Errors_Count;
 115
 116       --  Reset the indication that Optimize_Alignment was set locally, since
 117       --  if we had a pragma in the config file, it would set this flag True,
 118       --  but that's not a local setting.
 119
 120       Optimize_Alignment_Local := False;
 121    end Register_Config_Switches;
 122
 123    -----------------------------
 124    -- Restore_Config_Switches --
 125    -----------------------------
 126
 127    procedure Restore_Config_Switches (Save : Config_Switches_Type) is
 128    begin
 129       Ada_Version                    := Save.Ada_Version;
 130       Ada_Version_Pragma             := Save.Ada_Version_Pragma;
 131       Ada_Version_Explicit           := Save.Ada_Version_Explicit;
 132       Assertions_Enabled             := Save.Assertions_Enabled;
 133       Assume_No_Invalid_Values       := Save.Assume_No_Invalid_Values;
 134       Check_Float_Overflow           := Save.Check_Float_Overflow;
 135       Check_Policy_List              := Save.Check_Policy_List;
 136       Default_Pool                   := Save.Default_Pool;
 137       Default_SSO                    := Save.Default_SSO;
 138       Dynamic_Elaboration_Checks     := Save.Dynamic_Elaboration_Checks;
 139       Exception_Locations_Suppressed := Save.Exception_Locations_Suppressed;
 140       Extensions_Allowed             := Save.Extensions_Allowed;
 141       External_Name_Exp_Casing       := Save.External_Name_Exp_Casing;
 142       External_Name_Imp_Casing       := Save.External_Name_Imp_Casing;
 143       Fast_Math                      := Save.Fast_Math;
 144       Initialize_Scalars             := Save.Initialize_Scalars;
 145       No_Component_Reordering        := Save.No_Component_Reordering;
 146       Optimize_Alignment             := Save.Optimize_Alignment;
 147       Optimize_Alignment_Local       := Save.Optimize_Alignment_Local;
 148       Persistent_BSS_Mode            := Save.Persistent_BSS_Mode;
 149       Polling_Required               := Save.Polling_Required;
 150       Prefix_Exception_Messages      := Save.Prefix_Exception_Messages;
 151       SPARK_Mode                     := Save.SPARK_Mode;
 152       SPARK_Mode_Pragma              := Save.SPARK_Mode_Pragma;
 153       Uneval_Old                     := Save.Uneval_Old;
 154       Use_VADS_Size                  := Save.Use_VADS_Size;
 155       Warnings_As_Errors_Count       := Save.Warnings_As_Errors_Count;
 156
 157       --  Update consistently the value of Init_Or_Norm_Scalars. The value of
 158       --  Normalize_Scalars is not saved/restored because after set to True its
 159       --  value is never changed. That is, if a compilation unit has pragma
 160       --  Normalize_Scalars then it forces that value for all with'ed units.
 161
 162       Init_Or_Norm_Scalars := Initialize_Scalars or Normalize_Scalars;
 163    end Restore_Config_Switches;
 164
 165    --------------------------
 166    -- Save_Config_Switches --
 167    --------------------------
 168
 169    function Save_Config_Switches return Config_Switches_Type is
 170    begin
 171       return
 172         (Ada_Version                    => Ada_Version,
 173          Ada_Version_Pragma             => Ada_Version_Pragma,
 174          Ada_Version_Explicit           => Ada_Version_Explicit,
 175          Assertions_Enabled             => Assertions_Enabled,
 176          Assume_No_Invalid_Values       => Assume_No_Invalid_Values,
 177          Check_Float_Overflow           => Check_Float_Overflow,
 178          Check_Policy_List              => Check_Policy_List,
 179          Default_Pool                   => Default_Pool,
 180          Default_SSO                    => Default_SSO,
 181          Dynamic_Elaboration_Checks     => Dynamic_Elaboration_Checks,
 182          Exception_Locations_Suppressed => Exception_Locations_Suppressed,
 183          Extensions_Allowed             => Extensions_Allowed,
 184          External_Name_Exp_Casing       => External_Name_Exp_Casing,
 185          External_Name_Imp_Casing       => External_Name_Imp_Casing,
 186          Fast_Math                      => Fast_Math,
 187          Initialize_Scalars             => Initialize_Scalars,
 188          No_Component_Reordering        => No_Component_Reordering,
 189          Normalize_Scalars              => Normalize_Scalars,
 190          Optimize_Alignment             => Optimize_Alignment,
 191          Optimize_Alignment_Local       => Optimize_Alignment_Local,
 192          Persistent_BSS_Mode            => Persistent_BSS_Mode,
 193          Polling_Required               => Polling_Required,
 194          Prefix_Exception_Messages      => Prefix_Exception_Messages,
 195          SPARK_Mode                     => SPARK_Mode,
 196          SPARK_Mode_Pragma              => SPARK_Mode_Pragma,
 197          Uneval_Old                     => Uneval_Old,
 198          Use_VADS_Size                  => Use_VADS_Size,
 199          Warnings_As_Errors_Count       => Warnings_As_Errors_Count);
 200    end Save_Config_Switches;
 201
 202    -------------------------
 203    -- Set_Config_Switches --
 204    -------------------------
 205
 206    procedure Set_Config_Switches
 207      (Internal_Unit : Boolean;
 208       Main_Unit     : Boolean)
 209    is
 210    begin
 211       --  Case of internal unit
 212
 213       if Internal_Unit then
 214
 215          --  Set standard switches. Note we do NOT set Ada_Version_Explicit
 216          --  since the whole point of this is that it still properly indicates
 217          --  the configuration setting even in a run time unit.
 218
 219          Ada_Version                 := Ada_Version_Runtime;
 220          Ada_Version_Pragma          := Empty;
 221          Default_SSO                 := ' ';
 222          Dynamic_Elaboration_Checks  := False;
 223          Extensions_Allowed          := True;
 224          External_Name_Exp_Casing    := As_Is;
 225          External_Name_Imp_Casing    := Lowercase;
 226          No_Component_Reordering     := False;
 227          Optimize_Alignment          := 'O';
 228          Optimize_Alignment_Local    := True;
 229          Persistent_BSS_Mode         := False;
 230          Prefix_Exception_Messages   := True;
 231          Uneval_Old                  := 'E';
 232          Use_VADS_Size               := False;
 233
 234          --  Note: we do not need to worry about Warnings_As_Errors_Count since
 235          --  we do not expect to get any warnings from compiling such a unit.
 236
 237          --  For an internal unit, assertions/debug pragmas are off unless this
 238          --  is the main unit and they were explicitly enabled, or unless the
 239          --  main unit was compiled in GNAT mode. We also make sure we do not
 240          --  assume that values are necessarily valid and that SPARK_Mode is
 241          --  set to its configuration value.
 242
 243          if Main_Unit then
 244             Assertions_Enabled       := Assertions_Enabled_Config;
 245             Assume_No_Invalid_Values := Assume_No_Invalid_Values_Config;
 246             Check_Policy_List        := Check_Policy_List_Config;
 247             SPARK_Mode               := SPARK_Mode_Config;
 248             SPARK_Mode_Pragma        := SPARK_Mode_Pragma_Config;
 249
 250          else
 251             if GNAT_Mode_Config then
 252                Assertions_Enabled    := Assertions_Enabled_Config;
 253             else
 254                Assertions_Enabled    := False;
 255             end if;
 256
 257             Assume_No_Invalid_Values := False;
 258             Check_Policy_List        := Empty;
 259             SPARK_Mode               := None;
 260             SPARK_Mode_Pragma        := Empty;
 261          end if;
 262
 263       --  Case of non-internal unit
 264
 265       else
 266          Ada_Version                 := Ada_Version_Config;
 267          Ada_Version_Pragma          := Ada_Version_Pragma_Config;
 268          Ada_Version_Explicit        := Ada_Version_Explicit_Config;
 269          Assertions_Enabled          := Assertions_Enabled_Config;
 270          Assume_No_Invalid_Values    := Assume_No_Invalid_Values_Config;
 271          Check_Float_Overflow        := Check_Float_Overflow_Config;
 272          Check_Policy_List           := Check_Policy_List_Config;
 273          Default_SSO                 := Default_SSO_Config;
 274          Dynamic_Elaboration_Checks  := Dynamic_Elaboration_Checks_Config;
 275          Extensions_Allowed          := Extensions_Allowed_Config;
 276          External_Name_Exp_Casing    := External_Name_Exp_Casing_Config;
 277          External_Name_Imp_Casing    := External_Name_Imp_Casing_Config;
 278          Fast_Math                   := Fast_Math_Config;
 279          Initialize_Scalars          := Initialize_Scalars_Config;
 280          No_Component_Reordering     := No_Component_Reordering_Config;
 281          Optimize_Alignment          := Optimize_Alignment_Config;
 282          Optimize_Alignment_Local    := False;
 283          Persistent_BSS_Mode         := Persistent_BSS_Mode_Config;
 284          Prefix_Exception_Messages   := Prefix_Exception_Messages_Config;
 285          SPARK_Mode                  := SPARK_Mode_Config;
 286          SPARK_Mode_Pragma           := SPARK_Mode_Pragma_Config;
 287          Uneval_Old                  := Uneval_Old_Config;
 288          Use_VADS_Size               := Use_VADS_Size_Config;
 289          Warnings_As_Errors_Count    := Warnings_As_Errors_Count_Config;
 290
 291          --  Update consistently the value of Init_Or_Norm_Scalars. The value
 292          --  of Normalize_Scalars is not saved/restored because once set to
 293          --  True its value is never changed. That is, if a compilation unit
 294          --  has pragma Normalize_Scalars then it forces that value for all
 295          --  with'ed units.
 296
 297          Init_Or_Norm_Scalars := Initialize_Scalars or Normalize_Scalars;
 298       end if;
 299
 300       --  Values set for all units
 301
 302       Default_Pool                   := Default_Pool_Config;
 303       Exception_Locations_Suppressed := Exception_Locations_Suppressed_Config;
 304       Fast_Math                      := Fast_Math_Config;
 305       Polling_Required               := Polling_Required_Config;
 306    end Set_Config_Switches;
 307
 308    ---------------
 309    -- Tree_Read --
 310    ---------------
 311
 312    procedure Tree_Read is
 313       Tree_Version_String_Len         : Nat;
 314       Ada_Version_Config_Val          : Nat;
 315       Ada_Version_Explicit_Config_Val : Nat;
 316       Assertions_Enabled_Config_Val   : Nat;
 317
 318    begin
 319       Tree_Read_Int  (Tree_ASIS_Version_Number);
 320
 321       Tree_Read_Bool (Address_Is_Private);
 322       Tree_Read_Bool (Brief_Output);
 323       Tree_Read_Bool (GNAT_Mode);
 324       Tree_Read_Char (Identifier_Character_Set);
 325       Tree_Read_Bool (Ignore_Rep_Clauses);
 326       Tree_Read_Bool (Ignore_Style_Checks_Pragmas);
 327       Tree_Read_Int  (Maximum_File_Name_Length);
 328       Tree_Read_Data (Suppress_Options'Address,
 329                       (Suppress_Options'Size + SU - 1) / SU);
 330       Tree_Read_Bool (Verbose_Mode);
 331       Tree_Read_Data (Warning_Mode'Address,
 332                       (Warning_Mode'Size + SU - 1) / SU);
 333       Tree_Read_Int  (Ada_Version_Config_Val);
 334       Tree_Read_Int  (Ada_Version_Explicit_Config_Val);
 335       Tree_Read_Int  (Assertions_Enabled_Config_Val);
 336       Tree_Read_Bool (All_Errors_Mode);
 337       Tree_Read_Bool (Assertions_Enabled);
 338       Tree_Read_Bool (Check_Float_Overflow);
 339       Tree_Read_Int  (Int (Check_Policy_List));
 340       Tree_Read_Int  (Int (Default_Pool));
 341       Tree_Read_Bool (Full_List);
 342
 343       Ada_Version_Config :=
 344         Ada_Version_Type'Val (Ada_Version_Config_Val);
 345       Ada_Version_Explicit_Config :=
 346         Ada_Version_Type'Val (Ada_Version_Explicit_Config_Val);
 347       Assertions_Enabled_Config :=
 348         Boolean'Val (Assertions_Enabled_Config_Val);
 349
 350       --  Read version string: we have to get the length first
 351
 352       Tree_Read_Int (Tree_Version_String_Len);
 353
 354       declare
 355          Tmp : String (1 .. Integer (Tree_Version_String_Len));
 356       begin
 357          Tree_Read_Data
 358            (Tmp'Address, Tree_Version_String_Len);
 359          System.Strings.Free (Tree_Version_String);
 360          Free (Tree_Version_String);
 361          Tree_Version_String := new String'(Tmp);
 362       end;
 363
 364       Tree_Read_Data (Distribution_Stub_Mode'Address,
 365                       (Distribution_Stub_Mode'Size + SU - 1) / Storage_Unit);
 366       Tree_Read_Bool (Inline_Active);
 367       Tree_Read_Bool (Inline_Processing_Required);
 368       Tree_Read_Bool (List_Units);
 369       Tree_Read_Int  (Multiple_Unit_Index);
 370       Tree_Read_Bool (Configurable_Run_Time_Mode);
 371       Tree_Read_Data (Operating_Mode'Address,
 372                       (Operating_Mode'Size + SU - 1) / Storage_Unit);
 373       Tree_Read_Bool (Suppress_Checks);
 374       Tree_Read_Bool (Try_Semantics);
 375       Tree_Read_Data (Wide_Character_Encoding_Method'Address,
 376                       (Wide_Character_Encoding_Method'Size + SU - 1) / SU);
 377       Tree_Read_Bool (Upper_Half_Encoding);
 378       Tree_Read_Bool (Force_ALI_Tree_File);
 379    end Tree_Read;
 380
 381    ----------------
 382    -- Tree_Write --
 383    ----------------
 384
 385    procedure Tree_Write is
 386       Version_String : String := Gnat_Version_String;
 387
 388    begin
 389       Tree_Write_Int  (ASIS_Version_Number);
 390
 391       Tree_Write_Bool (Address_Is_Private);
 392       Tree_Write_Bool (Brief_Output);
 393       Tree_Write_Bool (GNAT_Mode);
 394       Tree_Write_Char (Identifier_Character_Set);
 395       Tree_Write_Bool (Ignore_Rep_Clauses);
 396       Tree_Write_Bool (Ignore_Style_Checks_Pragmas);
 397       Tree_Write_Int  (Maximum_File_Name_Length);
 398       Tree_Write_Data (Suppress_Options'Address,
 399                        (Suppress_Options'Size + SU - 1) / SU);
 400       Tree_Write_Bool (Verbose_Mode);
 401       Tree_Write_Data (Warning_Mode'Address,
 402                        (Warning_Mode'Size + SU - 1) / Storage_Unit);
 403       Tree_Write_Int  (Ada_Version_Type'Pos (Ada_Version_Config));
 404       Tree_Write_Int  (Ada_Version_Type'Pos (Ada_Version_Explicit_Config));
 405       Tree_Write_Int  (Boolean'Pos (Assertions_Enabled_Config));
 406       Tree_Write_Bool (All_Errors_Mode);
 407       Tree_Write_Bool (Assertions_Enabled);
 408       Tree_Write_Bool (Check_Float_Overflow);
 409       Tree_Write_Int  (Int (Check_Policy_List));
 410       Tree_Write_Int  (Int (Default_Pool));
 411       Tree_Write_Bool (Full_List);
 412       Tree_Write_Int  (Int (Version_String'Length));
 413       Tree_Write_Data (Version_String'Address, Version_String'Length);
 414       Tree_Write_Data (Distribution_Stub_Mode'Address,
 415                        (Distribution_Stub_Mode'Size + SU - 1) / SU);
 416       Tree_Write_Bool (Inline_Active);
 417       Tree_Write_Bool (Inline_Processing_Required);
 418       Tree_Write_Bool (List_Units);
 419       Tree_Write_Int  (Multiple_Unit_Index);
 420       Tree_Write_Bool (Configurable_Run_Time_Mode);
 421       Tree_Write_Data (Operating_Mode'Address,
 422                        (Operating_Mode'Size + SU - 1) / SU);
 423       Tree_Write_Bool (Suppress_Checks);
 424       Tree_Write_Bool (Try_Semantics);
 425       Tree_Write_Data (Wide_Character_Encoding_Method'Address,
 426                        (Wide_Character_Encoding_Method'Size + SU - 1) / SU);
 427       Tree_Write_Bool (Upper_Half_Encoding);
 428       Tree_Write_Bool (Force_ALI_Tree_File);
 429    end Tree_Write;
 430
 431 end Opt;