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) 1992-2020, 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.  See the GNU General Public License --
  17 -- for  more details.  You should have  received  a copy of the GNU General --
  18 -- Public License  distributed with GNAT; see file COPYING3.  If not, go to --
  19 -- http://www.gnu.org/licenses for a complete copy of the license.          --
  20 --                                                                          --
  21 -- GNAT was originally developed  by the GNAT team at  New York University. --
  22 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  23 --                                                                          --
  24 ------------------------------------------------------------------------------
  25
  26 package body Opt is
  27
  28    -------------------------
  29    -- Back_End_Exceptions --
  30    -------------------------
  31
  32    function Back_End_Exceptions return Boolean is
  33    begin
  34       return
  35         Exception_Mechanism = Back_End_SJLJ
  36           or else
  37         Exception_Mechanism = Back_End_ZCX;
  38    end Back_End_Exceptions;
  39
  40    -------------------------
  41    -- Front_End_Exceptions --
  42    -------------------------
  43
  44    function Front_End_Exceptions return Boolean is
  45    begin
  46       return Exception_Mechanism = Front_End_SJLJ;
  47    end Front_End_Exceptions;
  48
  49    --------------------
  50    -- SJLJ_Exceptions --
  51    --------------------
  52
  53    function SJLJ_Exceptions return Boolean is
  54    begin
  55       return
  56         Exception_Mechanism = Back_End_SJLJ
  57           or else
  58         Exception_Mechanism = Front_End_SJLJ;
  59    end SJLJ_Exceptions;
  60
  61    --------------------
  62    -- ZCX_Exceptions --
  63    --------------------
  64
  65    function ZCX_Exceptions return Boolean is
  66    begin
  67       return Exception_Mechanism = Back_End_ZCX;
  68    end ZCX_Exceptions;
  69
  70    ------------------------------
  71    -- Register_Config_Switches --
  72    ------------------------------
  73
  74    procedure Register_Config_Switches is
  75    begin
  76       Ada_Version_Config                    := Ada_Version;
  77       Ada_Version_Pragma_Config             := Ada_Version_Pragma;
  78       Ada_Version_Explicit_Config           := Ada_Version_Explicit;
  79       Assertions_Enabled_Config             := Assertions_Enabled;
  80       Assume_No_Invalid_Values_Config       := Assume_No_Invalid_Values;
  81       Check_Float_Overflow_Config           := Check_Float_Overflow;
  82       Check_Policy_List_Config              := Check_Policy_List;
  83       Default_Pool_Config                   := Default_Pool;
  84       Default_SSO_Config                    := Default_SSO;
  85       Dynamic_Elaboration_Checks_Config     := Dynamic_Elaboration_Checks;
  86       Exception_Locations_Suppressed_Config := Exception_Locations_Suppressed;
  87       Extensions_Allowed_Config             := Extensions_Allowed;
  88       External_Name_Exp_Casing_Config       := External_Name_Exp_Casing;
  89       External_Name_Imp_Casing_Config       := External_Name_Imp_Casing;
  90       Fast_Math_Config                      := Fast_Math;
  91       Initialize_Scalars_Config             := Initialize_Scalars;
  92       No_Component_Reordering_Config        := No_Component_Reordering;
  93       Optimize_Alignment_Config             := Optimize_Alignment;
  94       Persistent_BSS_Mode_Config            := Persistent_BSS_Mode;
  95       Prefix_Exception_Messages_Config      := Prefix_Exception_Messages;
  96       SPARK_Mode_Config                     := SPARK_Mode;
  97       SPARK_Mode_Pragma_Config              := SPARK_Mode_Pragma;
  98       Uneval_Old_Config                     := Uneval_Old;
  99       Use_VADS_Size_Config                  := Use_VADS_Size;
 100       Warnings_As_Errors_Count_Config       := Warnings_As_Errors_Count;
 101
 102       --  Reset the indication that Optimize_Alignment was set locally, since
 103       --  if we had a pragma in the config file, it would set this flag True,
 104       --  but that's not a local setting.
 105
 106       Optimize_Alignment_Local := False;
 107    end Register_Config_Switches;
 108
 109    -----------------------------
 110    -- Restore_Config_Switches --
 111    -----------------------------
 112
 113    procedure Restore_Config_Switches (Save : Config_Switches_Type) is
 114    begin
 115       Ada_Version                    := Save.Ada_Version;
 116       Ada_Version_Pragma             := Save.Ada_Version_Pragma;
 117       Ada_Version_Explicit           := Save.Ada_Version_Explicit;
 118       Assertions_Enabled             := Save.Assertions_Enabled;
 119       Assume_No_Invalid_Values       := Save.Assume_No_Invalid_Values;
 120       Check_Float_Overflow           := Save.Check_Float_Overflow;
 121       Check_Policy_List              := Save.Check_Policy_List;
 122       Default_Pool                   := Save.Default_Pool;
 123       Default_SSO                    := Save.Default_SSO;
 124       Dynamic_Elaboration_Checks     := Save.Dynamic_Elaboration_Checks;
 125       Exception_Locations_Suppressed := Save.Exception_Locations_Suppressed;
 126       Extensions_Allowed             := Save.Extensions_Allowed;
 127       External_Name_Exp_Casing       := Save.External_Name_Exp_Casing;
 128       External_Name_Imp_Casing       := Save.External_Name_Imp_Casing;
 129       Fast_Math                      := Save.Fast_Math;
 130       Initialize_Scalars             := Save.Initialize_Scalars;
 131       No_Component_Reordering        := Save.No_Component_Reordering;
 132       Optimize_Alignment             := Save.Optimize_Alignment;
 133       Optimize_Alignment_Local       := Save.Optimize_Alignment_Local;
 134       Persistent_BSS_Mode            := Save.Persistent_BSS_Mode;
 135       Prefix_Exception_Messages      := Save.Prefix_Exception_Messages;
 136       SPARK_Mode                     := Save.SPARK_Mode;
 137       SPARK_Mode_Pragma              := Save.SPARK_Mode_Pragma;
 138       Uneval_Old                     := Save.Uneval_Old;
 139       Use_VADS_Size                  := Save.Use_VADS_Size;
 140       Warnings_As_Errors_Count       := Save.Warnings_As_Errors_Count;
 141
 142       --  Update consistently the value of Init_Or_Norm_Scalars. The value of
 143       --  Normalize_Scalars is not saved/restored because after set to True its
 144       --  value is never changed. That is, if a compilation unit has pragma
 145       --  Normalize_Scalars then it forces that value for all with'ed units.
 146
 147       Init_Or_Norm_Scalars := Initialize_Scalars or Normalize_Scalars;
 148    end Restore_Config_Switches;
 149
 150    --------------------------
 151    -- Save_Config_Switches --
 152    --------------------------
 153
 154    function Save_Config_Switches return Config_Switches_Type is
 155    begin
 156       return
 157         (Ada_Version                    => Ada_Version,
 158          Ada_Version_Pragma             => Ada_Version_Pragma,
 159          Ada_Version_Explicit           => Ada_Version_Explicit,
 160          Assertions_Enabled             => Assertions_Enabled,
 161          Assume_No_Invalid_Values       => Assume_No_Invalid_Values,
 162          Check_Float_Overflow           => Check_Float_Overflow,
 163          Check_Policy_List              => Check_Policy_List,
 164          Default_Pool                   => Default_Pool,
 165          Default_SSO                    => Default_SSO,
 166          Dynamic_Elaboration_Checks     => Dynamic_Elaboration_Checks,
 167          Exception_Locations_Suppressed => Exception_Locations_Suppressed,
 168          Extensions_Allowed             => Extensions_Allowed,
 169          External_Name_Exp_Casing       => External_Name_Exp_Casing,
 170          External_Name_Imp_Casing       => External_Name_Imp_Casing,
 171          Fast_Math                      => Fast_Math,
 172          Initialize_Scalars             => Initialize_Scalars,
 173          No_Component_Reordering        => No_Component_Reordering,
 174          Normalize_Scalars              => Normalize_Scalars,
 175          Optimize_Alignment             => Optimize_Alignment,
 176          Optimize_Alignment_Local       => Optimize_Alignment_Local,
 177          Persistent_BSS_Mode            => Persistent_BSS_Mode,
 178          Prefix_Exception_Messages      => Prefix_Exception_Messages,
 179          SPARK_Mode                     => SPARK_Mode,
 180          SPARK_Mode_Pragma              => SPARK_Mode_Pragma,
 181          Uneval_Old                     => Uneval_Old,
 182          Use_VADS_Size                  => Use_VADS_Size,
 183          Warnings_As_Errors_Count       => Warnings_As_Errors_Count);
 184    end Save_Config_Switches;
 185
 186    -------------------------
 187    -- Set_Config_Switches --
 188    -------------------------
 189
 190    procedure Set_Config_Switches
 191      (Internal_Unit : Boolean;
 192       Main_Unit     : Boolean)
 193    is
 194    begin
 195       --  Case of internal unit
 196
 197       if Internal_Unit then
 198
 199          --  Set standard switches. Note we do NOT set Ada_Version_Explicit
 200          --  since the whole point of this is that it still properly indicates
 201          --  the configuration setting even in a run time unit.
 202
 203          Ada_Version                 := Ada_Version_Runtime;
 204          Ada_Version_Pragma          := Empty;
 205          Default_SSO                 := ' ';
 206          Dynamic_Elaboration_Checks  := False;
 207          Extensions_Allowed          := True;
 208          External_Name_Exp_Casing    := As_Is;
 209          External_Name_Imp_Casing    := Lowercase;
 210          No_Component_Reordering     := False;
 211          Optimize_Alignment          := 'O';
 212          Optimize_Alignment_Local    := True;
 213          Persistent_BSS_Mode         := False;
 214          Prefix_Exception_Messages   := True;
 215          Uneval_Old                  := 'E';
 216          Use_VADS_Size               := False;
 217
 218          --  Note: we do not need to worry about Warnings_As_Errors_Count since
 219          --  we do not expect to get any warnings from compiling such a unit.
 220
 221          --  For an internal unit, assertions/debug pragmas are off unless this
 222          --  is the main unit and they were explicitly enabled, or unless the
 223          --  main unit was compiled in GNAT mode. We also make sure we do not
 224          --  assume that values are necessarily valid and that SPARK_Mode is
 225          --  set to its configuration value.
 226
 227          if Main_Unit then
 228             Assertions_Enabled       := Assertions_Enabled_Config;
 229             Assume_No_Invalid_Values := Assume_No_Invalid_Values_Config;
 230             Check_Policy_List        := Check_Policy_List_Config;
 231             SPARK_Mode               := SPARK_Mode_Config;
 232             SPARK_Mode_Pragma        := SPARK_Mode_Pragma_Config;
 233
 234          else
 235             --  In GNATprove mode assertions should be always enabled, even
 236             --  when analysing internal units.
 237
 238             if GNATprove_Mode then
 239                pragma Assert (Assertions_Enabled);
 240                null;
 241
 242             elsif GNAT_Mode_Config then
 243                Assertions_Enabled    := Assertions_Enabled_Config;
 244             else
 245                Assertions_Enabled    := False;
 246             end if;
 247
 248             Assume_No_Invalid_Values := False;
 249             Check_Policy_List        := Empty;
 250             SPARK_Mode               := None;
 251             SPARK_Mode_Pragma        := Empty;
 252          end if;
 253
 254       --  Case of non-internal unit
 255
 256       else
 257          Ada_Version                 := Ada_Version_Config;
 258          Ada_Version_Pragma          := Ada_Version_Pragma_Config;
 259          Ada_Version_Explicit        := Ada_Version_Explicit_Config;
 260          Assertions_Enabled          := Assertions_Enabled_Config;
 261          Assume_No_Invalid_Values    := Assume_No_Invalid_Values_Config;
 262          Check_Float_Overflow        := Check_Float_Overflow_Config;
 263          Check_Policy_List           := Check_Policy_List_Config;
 264          Default_SSO                 := Default_SSO_Config;
 265          Dynamic_Elaboration_Checks  := Dynamic_Elaboration_Checks_Config;
 266          Extensions_Allowed          := Extensions_Allowed_Config;
 267          External_Name_Exp_Casing    := External_Name_Exp_Casing_Config;
 268          External_Name_Imp_Casing    := External_Name_Imp_Casing_Config;
 269          Fast_Math                   := Fast_Math_Config;
 270          Initialize_Scalars          := Initialize_Scalars_Config;
 271          No_Component_Reordering     := No_Component_Reordering_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    end Set_Config_Switches;
 297
 298 end Opt;