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) 1992-2023, 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 with Csets;          use Csets;
  27
  28 package body Opt is
  29
  30    --------------------
  31    -- SJLJ_Exceptions --
  32    --------------------
  33
  34    function SJLJ_Exceptions return Boolean is
  35    begin
  36       return Exception_Mechanism = Back_End_SJLJ;
  37    end SJLJ_Exceptions;
  38
  39    --------------------
  40    -- ZCX_Exceptions --
  41    --------------------
  42
  43    function ZCX_Exceptions return Boolean is
  44    begin
  45       return Exception_Mechanism = Back_End_ZCX;
  46    end ZCX_Exceptions;
  47
  48    ------------------------------
  49    -- Register_Config_Switches --
  50    ------------------------------
  51
  52    procedure Register_Config_Switches is
  53    begin
  54       Ada_Version_Config                    := Ada_Version;
  55       Ada_Version_Pragma_Config             := Ada_Version_Pragma;
  56       Ada_Version_Explicit_Config           := Ada_Version_Explicit;
  57       Assertions_Enabled_Config             := Assertions_Enabled;
  58       Assume_No_Invalid_Values_Config       := Assume_No_Invalid_Values;
  59       Check_Float_Overflow_Config           := Check_Float_Overflow;
  60       Check_Policy_List_Config              := Check_Policy_List;
  61       Default_Pool_Config                   := Default_Pool;
  62       Default_SSO_Config                    := Default_SSO;
  63       Dynamic_Elaboration_Checks_Config     := Dynamic_Elaboration_Checks;
  64       Exception_Locations_Suppressed_Config := Exception_Locations_Suppressed;
  65       External_Name_Exp_Casing_Config       := External_Name_Exp_Casing;
  66       External_Name_Imp_Casing_Config       := External_Name_Imp_Casing;
  67       Fast_Math_Config                      := Fast_Math;
  68       Initialize_Scalars_Config             := Initialize_Scalars;
  69       No_Component_Reordering_Config        := No_Component_Reordering;
  70       Optimize_Alignment_Config             := Optimize_Alignment;
  71       Persistent_BSS_Mode_Config            := Persistent_BSS_Mode;
  72       Prefix_Exception_Messages_Config      := Prefix_Exception_Messages;
  73       SPARK_Mode_Config                     := SPARK_Mode;
  74       SPARK_Mode_Pragma_Config              := SPARK_Mode_Pragma;
  75       Uneval_Old_Config                     := Uneval_Old;
  76       Use_VADS_Size_Config                  := Use_VADS_Size;
  77       Warnings_As_Errors_Count_Config       := Warnings_As_Errors_Count;
  78
  79       --  Reset the indication that Optimize_Alignment was set locally, since
  80       --  if we had a pragma in the config file, it would set this flag True,
  81       --  but that's not a local setting.
  82
  83       Optimize_Alignment_Local := False;
  84    end Register_Config_Switches;
  85
  86    -----------------------------
  87    -- Restore_Config_Switches --
  88    -----------------------------
  89
  90    procedure Restore_Config_Switches (Save : Config_Switches_Type) is
  91    begin
  92       Ada_Version                    := Save.Ada_Version;
  93       Ada_Version_Pragma             := Save.Ada_Version_Pragma;
  94       Ada_Version_Explicit           := Save.Ada_Version_Explicit;
  95       Assertions_Enabled             := Save.Assertions_Enabled;
  96       Assume_No_Invalid_Values       := Save.Assume_No_Invalid_Values;
  97       Check_Float_Overflow           := Save.Check_Float_Overflow;
  98       Check_Policy_List              := Save.Check_Policy_List;
  99       Default_Pool                   := Save.Default_Pool;
 100       Default_SSO                    := Save.Default_SSO;
 101       Dynamic_Elaboration_Checks     := Save.Dynamic_Elaboration_Checks;
 102       Exception_Locations_Suppressed := Save.Exception_Locations_Suppressed;
 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       No_Component_Reordering        := Save.No_Component_Reordering;
 108       Optimize_Alignment             := Save.Optimize_Alignment;
 109       Optimize_Alignment_Local       := Save.Optimize_Alignment_Local;
 110       Persistent_BSS_Mode            := Save.Persistent_BSS_Mode;
 111       Prefix_Exception_Messages      := Save.Prefix_Exception_Messages;
 112       SPARK_Mode                     := Save.SPARK_Mode;
 113       SPARK_Mode_Pragma              := Save.SPARK_Mode_Pragma;
 114       Uneval_Old                     := Save.Uneval_Old;
 115       Use_VADS_Size                  := Save.Use_VADS_Size;
 116       Warnings_As_Errors_Count       := Save.Warnings_As_Errors_Count;
 117
 118       --  Update consistently the value of Init_Or_Norm_Scalars. The value of
 119       --  Normalize_Scalars is not saved/restored because after set to True its
 120       --  value is never changed. That is, if a compilation unit has pragma
 121       --  Normalize_Scalars then it forces that value for all with'ed units.
 122
 123       Init_Or_Norm_Scalars := Initialize_Scalars or Normalize_Scalars;
 124    end Restore_Config_Switches;
 125
 126    --------------------------
 127    -- Save_Config_Switches --
 128    --------------------------
 129
 130    function Save_Config_Switches return Config_Switches_Type is
 131    begin
 132       return
 133         (Ada_Version                    => Ada_Version,
 134          Ada_Version_Pragma             => Ada_Version_Pragma,
 135          Ada_Version_Explicit           => Ada_Version_Explicit,
 136          Assertions_Enabled             => Assertions_Enabled,
 137          Assume_No_Invalid_Values       => Assume_No_Invalid_Values,
 138          Check_Float_Overflow           => Check_Float_Overflow,
 139          Check_Policy_List              => Check_Policy_List,
 140          Default_Pool                   => Default_Pool,
 141          Default_SSO                    => Default_SSO,
 142          Dynamic_Elaboration_Checks     => Dynamic_Elaboration_Checks,
 143          Exception_Locations_Suppressed => Exception_Locations_Suppressed,
 144          External_Name_Exp_Casing       => External_Name_Exp_Casing,
 145          External_Name_Imp_Casing       => External_Name_Imp_Casing,
 146          Fast_Math                      => Fast_Math,
 147          Initialize_Scalars             => Initialize_Scalars,
 148          No_Component_Reordering        => No_Component_Reordering,
 149          Normalize_Scalars              => Normalize_Scalars,
 150          Optimize_Alignment             => Optimize_Alignment,
 151          Optimize_Alignment_Local       => Optimize_Alignment_Local,
 152          Persistent_BSS_Mode            => Persistent_BSS_Mode,
 153          Prefix_Exception_Messages      => Prefix_Exception_Messages,
 154          SPARK_Mode                     => SPARK_Mode,
 155          SPARK_Mode_Pragma              => SPARK_Mode_Pragma,
 156          Uneval_Old                     => Uneval_Old,
 157          Use_VADS_Size                  => Use_VADS_Size,
 158          Warnings_As_Errors_Count       => Warnings_As_Errors_Count);
 159    end Save_Config_Switches;
 160
 161    -------------------------
 162    -- Set_Config_Switches --
 163    -------------------------
 164
 165    procedure Set_Config_Switches
 166      (Internal_Unit : Boolean;
 167       Main_Unit     : Boolean)
 168    is
 169    begin
 170       --  Case of internal unit
 171
 172       if Internal_Unit then
 173
 174          --  Set standard switches. Note we do NOT set Ada_Version_Explicit
 175          --  since the whole point of this is that it still properly indicates
 176          --  the configuration setting even in a run time unit.
 177
 178          Ada_Version                 := Ada_Version_Runtime;
 179          Ada_Version_Pragma          := Empty;
 180          Default_SSO                 := ' ';
 181          Dynamic_Elaboration_Checks  := False;
 182          External_Name_Exp_Casing    := As_Is;
 183          External_Name_Imp_Casing    := Lowercase;
 184          No_Component_Reordering     := False;
 185          Optimize_Alignment          := 'O';
 186          Optimize_Alignment_Local    := True;
 187          Persistent_BSS_Mode         := False;
 188          Prefix_Exception_Messages   := True;
 189          Uneval_Old                  := 'E';
 190          Use_VADS_Size               := False;
 191          Identifier_Char ('[')       := False;
 192
 193          --  Note: we do not need to worry about Warnings_As_Errors_Count since
 194          --  we do not expect to get any warnings from compiling such a unit.
 195
 196          --  For an internal unit, assertions/debug pragmas are off unless this
 197          --  is the main unit and they were explicitly enabled, or unless the
 198          --  main unit was compiled in GNAT mode. We also make sure we do not
 199          --  assume that values are necessarily valid and that SPARK_Mode is
 200          --  set to its configuration value.
 201
 202          if Main_Unit then
 203             Assertions_Enabled       := Assertions_Enabled_Config;
 204             Assume_No_Invalid_Values := Assume_No_Invalid_Values_Config;
 205             Check_Policy_List        := Check_Policy_List_Config;
 206             SPARK_Mode               := SPARK_Mode_Config;
 207             SPARK_Mode_Pragma        := SPARK_Mode_Pragma_Config;
 208
 209          else
 210             --  In GNATprove mode assertions should be always enabled, even
 211             --  when analysing internal units.
 212
 213             if GNATprove_Mode then
 214                pragma Assert (Assertions_Enabled);
 215                null;
 216
 217             elsif GNAT_Mode_Config then
 218                Assertions_Enabled    := Assertions_Enabled_Config;
 219             else
 220                Assertions_Enabled    := False;
 221             end if;
 222
 223             Assume_No_Invalid_Values := False;
 224             Check_Policy_List        := Empty;
 225             SPARK_Mode               := None;
 226             SPARK_Mode_Pragma        := Empty;
 227          end if;
 228
 229       --  Case of non-internal unit
 230
 231       else
 232          Ada_Version                 := Ada_Version_Config;
 233          Ada_Version_Pragma          := Ada_Version_Pragma_Config;
 234          Ada_Version_Explicit        := Ada_Version_Explicit_Config;
 235          Assertions_Enabled          := Assertions_Enabled_Config;
 236          Assume_No_Invalid_Values    := Assume_No_Invalid_Values_Config;
 237          Check_Float_Overflow        := Check_Float_Overflow_Config;
 238          Check_Policy_List           := Check_Policy_List_Config;
 239          Default_SSO                 := Default_SSO_Config;
 240          Dynamic_Elaboration_Checks  := Dynamic_Elaboration_Checks_Config;
 241          External_Name_Exp_Casing    := External_Name_Exp_Casing_Config;
 242          External_Name_Imp_Casing    := External_Name_Imp_Casing_Config;
 243          Fast_Math                   := Fast_Math_Config;
 244          Initialize_Scalars          := Initialize_Scalars_Config;
 245          No_Component_Reordering     := No_Component_Reordering_Config;
 246          Optimize_Alignment          := Optimize_Alignment_Config;
 247          Optimize_Alignment_Local    := False;
 248          Persistent_BSS_Mode         := Persistent_BSS_Mode_Config;
 249          Prefix_Exception_Messages   := Prefix_Exception_Messages_Config;
 250          SPARK_Mode                  := SPARK_Mode_Config;
 251          SPARK_Mode_Pragma           := SPARK_Mode_Pragma_Config;
 252          Uneval_Old                  := Uneval_Old_Config;
 253          Use_VADS_Size               := Use_VADS_Size_Config;
 254          Warnings_As_Errors_Count    := Warnings_As_Errors_Count_Config;
 255
 256          --  Update consistently the value of Init_Or_Norm_Scalars. The value
 257          --  of Normalize_Scalars is not saved/restored because once set to
 258          --  True its value is never changed. That is, if a compilation unit
 259          --  has pragma Normalize_Scalars then it forces that value for all
 260          --  with'ed units.
 261
 262          Init_Or_Norm_Scalars := Initialize_Scalars or Normalize_Scalars;
 263       end if;
 264
 265       --  Values set for all units
 266
 267       Default_Pool                   := Default_Pool_Config;
 268       Exception_Locations_Suppressed := Exception_Locations_Suppressed_Config;
 269       Fast_Math                      := Fast_Math_Config;
 270    end Set_Config_Switches;
 271
 272 end Opt;