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) 1992-2011, 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_Explicit_Config           := Ada_Version_Explicit;
  49       Assertions_Enabled_Config             := Assertions_Enabled;
  50       Assume_No_Invalid_Values_Config       := Assume_No_Invalid_Values;
  51       Check_Policy_List_Config              := Check_Policy_List;
  52       Debug_Pragmas_Enabled_Config          := Debug_Pragmas_Enabled;
  53       Default_Pool_Config                   := Default_Pool;
  54       Dynamic_Elaboration_Checks_Config     := Dynamic_Elaboration_Checks;
  55       Exception_Locations_Suppressed_Config := Exception_Locations_Suppressed;
  56       Extensions_Allowed_Config             := Extensions_Allowed;
  57       External_Name_Exp_Casing_Config       := External_Name_Exp_Casing;
  58       External_Name_Imp_Casing_Config       := External_Name_Imp_Casing;
  59       Fast_Math_Config                      := Fast_Math;
  60       Initialize_Scalars_Config             := Initialize_Scalars;
  61       Optimize_Alignment_Config             := Optimize_Alignment;
  62       Persistent_BSS_Mode_Config            := Persistent_BSS_Mode;
  63       Polling_Required_Config               := Polling_Required;
  64       Short_Descriptors_Config              := Short_Descriptors;
  65       Use_VADS_Size_Config                  := Use_VADS_Size;
  66
  67       --  Reset the indication that Optimize_Alignment was set locally, since
  68       --  if we had a pragma in the config file, it would set this flag True,
  69       --  but that's not a local setting.
  70
  71       Optimize_Alignment_Local := False;
  72    end Register_Opt_Config_Switches;
  73
  74    ---------------------------------
  75    -- Restore_Opt_Config_Switches --
  76    ---------------------------------
  77
  78    procedure Restore_Opt_Config_Switches (Save : Config_Switches_Type) is
  79    begin
  80       Ada_Version                    := Save.Ada_Version;
  81       Ada_Version_Explicit           := Save.Ada_Version_Explicit;
  82       Assertions_Enabled             := Save.Assertions_Enabled;
  83       Assume_No_Invalid_Values       := Save.Assume_No_Invalid_Values;
  84       Check_Policy_List              := Save.Check_Policy_List;
  85       Debug_Pragmas_Enabled          := Save.Debug_Pragmas_Enabled;
  86       Default_Pool                   := Save.Default_Pool;
  87       Dynamic_Elaboration_Checks     := Save.Dynamic_Elaboration_Checks;
  88       Exception_Locations_Suppressed := Save.Exception_Locations_Suppressed;
  89       Extensions_Allowed             := Save.Extensions_Allowed;
  90       External_Name_Exp_Casing       := Save.External_Name_Exp_Casing;
  91       External_Name_Imp_Casing       := Save.External_Name_Imp_Casing;
  92       Fast_Math                      := Save.Fast_Math;
  93       Initialize_Scalars             := Save.Initialize_Scalars;
  94       Optimize_Alignment             := Save.Optimize_Alignment;
  95       Optimize_Alignment_Local       := Save.Optimize_Alignment_Local;
  96       Persistent_BSS_Mode            := Save.Persistent_BSS_Mode;
  97       Polling_Required               := Save.Polling_Required;
  98       Short_Descriptors              := Save.Short_Descriptors;
  99       Use_VADS_Size                  := Save.Use_VADS_Size;
 100
 101       --  Update consistently the value of Init_Or_Norm_Scalars. The value of
 102       --  Normalize_Scalars is not saved/restored because after set to True its
 103       --  value is never changed. That is, if a compilation unit has pragma
 104       --  Normalize_Scalars then it forces that value for all with'ed units.
 105
 106       Init_Or_Norm_Scalars := Initialize_Scalars or Normalize_Scalars;
 107    end Restore_Opt_Config_Switches;
 108
 109    ------------------------------
 110    -- Save_Opt_Config_Switches --
 111    ------------------------------
 112
 113    procedure Save_Opt_Config_Switches (Save : out Config_Switches_Type) is
 114    begin
 115       Save.Ada_Version                    := Ada_Version;
 116       Save.Ada_Version_Explicit           := Ada_Version_Explicit;
 117       Save.Assertions_Enabled             := Assertions_Enabled;
 118       Save.Assume_No_Invalid_Values       := Assume_No_Invalid_Values;
 119       Save.Check_Policy_List              := Check_Policy_List;
 120       Save.Debug_Pragmas_Enabled          := Debug_Pragmas_Enabled;
 121       Save.Default_Pool                   := Default_Pool;
 122       Save.Dynamic_Elaboration_Checks     := Dynamic_Elaboration_Checks;
 123       Save.Exception_Locations_Suppressed := Exception_Locations_Suppressed;
 124       Save.Extensions_Allowed             := Extensions_Allowed;
 125       Save.External_Name_Exp_Casing       := External_Name_Exp_Casing;
 126       Save.External_Name_Imp_Casing       := External_Name_Imp_Casing;
 127       Save.Fast_Math                      := Fast_Math;
 128       Save.Initialize_Scalars             := Initialize_Scalars;
 129       Save.Optimize_Alignment             := Optimize_Alignment;
 130       Save.Optimize_Alignment_Local       := Optimize_Alignment_Local;
 131       Save.Persistent_BSS_Mode            := Persistent_BSS_Mode;
 132       Save.Polling_Required               := Polling_Required;
 133       Save.Short_Descriptors              := Short_Descriptors;
 134       Save.Use_VADS_Size                  := Use_VADS_Size;
 135    end Save_Opt_Config_Switches;
 136
 137    -----------------------------
 138    -- Set_Opt_Config_Switches --
 139    -----------------------------
 140
 141    procedure Set_Opt_Config_Switches
 142      (Internal_Unit : Boolean;
 143       Main_Unit     : Boolean)
 144    is
 145    begin
 146       --  Case of internal unit
 147
 148       if Internal_Unit then
 149
 150          --  Set standard switches. Note we do NOT set Ada_Version_Explicit
 151          --  since the whole point of this is that it still properly indicates
 152          --  the configuration setting even in a run time unit.
 153
 154          Ada_Version                 := Ada_Version_Runtime;
 155          Dynamic_Elaboration_Checks  := False;
 156          Extensions_Allowed          := True;
 157          External_Name_Exp_Casing    := As_Is;
 158          External_Name_Imp_Casing    := Lowercase;
 159          Optimize_Alignment          := 'O';
 160          Persistent_BSS_Mode         := False;
 161          Use_VADS_Size               := False;
 162          Optimize_Alignment_Local    := True;
 163
 164          --  For an internal unit, assertions/debug pragmas are off unless this
 165          --  is the main unit and they were explicitly enabled. We also make
 166          --  sure we do not assume that values are necessarily valid.
 167
 168          if Main_Unit then
 169             Assertions_Enabled       := Assertions_Enabled_Config;
 170             Assume_No_Invalid_Values := Assume_No_Invalid_Values_Config;
 171             Debug_Pragmas_Enabled    := Debug_Pragmas_Enabled_Config;
 172             Check_Policy_List        := Check_Policy_List_Config;
 173          else
 174             Assertions_Enabled       := False;
 175             Assume_No_Invalid_Values := False;
 176             Debug_Pragmas_Enabled    := False;
 177             Check_Policy_List        := Empty;
 178          end if;
 179
 180       --  Case of non-internal unit
 181
 182       else
 183          Ada_Version                 := Ada_Version_Config;
 184          Ada_Version_Explicit        := Ada_Version_Explicit_Config;
 185          Assertions_Enabled          := Assertions_Enabled_Config;
 186          Assume_No_Invalid_Values    := Assume_No_Invalid_Values_Config;
 187          Check_Policy_List           := Check_Policy_List_Config;
 188          Debug_Pragmas_Enabled       := Debug_Pragmas_Enabled_Config;
 189          Dynamic_Elaboration_Checks  := Dynamic_Elaboration_Checks_Config;
 190          Extensions_Allowed          := Extensions_Allowed_Config;
 191          External_Name_Exp_Casing    := External_Name_Exp_Casing_Config;
 192          External_Name_Imp_Casing    := External_Name_Imp_Casing_Config;
 193          Fast_Math                   := Fast_Math_Config;
 194          Initialize_Scalars          := Initialize_Scalars_Config;
 195          Optimize_Alignment          := Optimize_Alignment_Config;
 196          Optimize_Alignment_Local    := False;
 197          Persistent_BSS_Mode         := Persistent_BSS_Mode_Config;
 198          Use_VADS_Size               := Use_VADS_Size_Config;
 199
 200          --  Update consistently the value of Init_Or_Norm_Scalars. The value
 201          --  of Normalize_Scalars is not saved/restored because once set to
 202          --  True its value is never changed. That is, if a compilation unit
 203          --  has pragma Normalize_Scalars then it forces that value for all
 204          --  with'ed units.
 205
 206          Init_Or_Norm_Scalars := Initialize_Scalars or Normalize_Scalars;
 207       end if;
 208
 209       Default_Pool                   := Default_Pool_Config;
 210       Exception_Locations_Suppressed := Exception_Locations_Suppressed_Config;
 211       Fast_Math                      := Fast_Math_Config;
 212       Optimize_Alignment             := Optimize_Alignment_Config;
 213       Polling_Required               := Polling_Required_Config;
 214       Short_Descriptors              := Short_Descriptors_Config;
 215    end Set_Opt_Config_Switches;
 216
 217    ---------------
 218    -- Tree_Read --
 219    ---------------
 220
 221    procedure Tree_Read is
 222       Tree_Version_String_Len         : Nat;
 223       Ada_Version_Config_Val          : Nat;
 224       Ada_Version_Explicit_Config_Val : Nat;
 225       Assertions_Enabled_Config_Val   : Nat;
 226
 227    begin
 228       Tree_Read_Int  (Tree_ASIS_Version_Number);
 229       Tree_Read_Bool (Brief_Output);
 230       Tree_Read_Bool (GNAT_Mode);
 231       Tree_Read_Char (Identifier_Character_Set);
 232       Tree_Read_Int  (Maximum_File_Name_Length);
 233       Tree_Read_Data (Suppress_Options'Address,
 234                       (Suppress_Options'Size + SU - 1) / SU);
 235       Tree_Read_Bool (Verbose_Mode);
 236       Tree_Read_Data (Warning_Mode'Address,
 237                       (Warning_Mode'Size + SU - 1) / SU);
 238       Tree_Read_Int  (Ada_Version_Config_Val);
 239       Tree_Read_Int  (Ada_Version_Explicit_Config_Val);
 240       Tree_Read_Int  (Assertions_Enabled_Config_Val);
 241       Tree_Read_Bool (All_Errors_Mode);
 242       Tree_Read_Bool (Assertions_Enabled);
 243       Tree_Read_Int  (Int (Check_Policy_List));
 244       Tree_Read_Bool (Debug_Pragmas_Enabled);
 245       Tree_Read_Int  (Int (Default_Pool));
 246       Tree_Read_Bool (Enable_Overflow_Checks);
 247       Tree_Read_Bool (Full_List);
 248
 249       Ada_Version_Config :=
 250         Ada_Version_Type'Val (Ada_Version_Config_Val);
 251       Ada_Version_Explicit_Config :=
 252         Ada_Version_Type'Val (Ada_Version_Explicit_Config_Val);
 253       Assertions_Enabled_Config :=
 254         Boolean'Val (Assertions_Enabled_Config_Val);
 255
 256       --  Read version string: we have to get the length first
 257
 258       Tree_Read_Int (Tree_Version_String_Len);
 259
 260       declare
 261          Tmp : String (1 .. Integer (Tree_Version_String_Len));
 262       begin
 263          Tree_Read_Data
 264            (Tmp'Address, Tree_Version_String_Len);
 265          System.Strings.Free (Tree_Version_String);
 266          Free (Tree_Version_String);
 267          Tree_Version_String := new String'(Tmp);
 268       end;
 269
 270       Tree_Read_Data (Distribution_Stub_Mode'Address,
 271                       (Distribution_Stub_Mode'Size + SU - 1) / Storage_Unit);
 272       Tree_Read_Bool (Inline_Active);
 273       Tree_Read_Bool (Inline_Processing_Required);
 274       Tree_Read_Bool (List_Units);
 275       Tree_Read_Bool (Configurable_Run_Time_Mode);
 276       Tree_Read_Data (Operating_Mode'Address,
 277                       (Operating_Mode'Size + SU - 1) / Storage_Unit);
 278       Tree_Read_Bool (Suppress_Checks);
 279       Tree_Read_Bool (Try_Semantics);
 280       Tree_Read_Data (Wide_Character_Encoding_Method'Address,
 281                       (Wide_Character_Encoding_Method'Size + SU - 1) / SU);
 282       Tree_Read_Bool (Upper_Half_Encoding);
 283       Tree_Read_Bool (Force_ALI_Tree_File);
 284    end Tree_Read;
 285
 286    ----------------
 287    -- Tree_Write --
 288    ----------------
 289
 290    procedure Tree_Write is
 291       Version_String : String := Gnat_Version_String;
 292
 293    begin
 294       Tree_Write_Int  (ASIS_Version_Number);
 295       Tree_Write_Bool (Brief_Output);
 296       Tree_Write_Bool (GNAT_Mode);
 297       Tree_Write_Char (Identifier_Character_Set);
 298       Tree_Write_Int  (Maximum_File_Name_Length);
 299       Tree_Write_Data (Suppress_Options'Address,
 300                        (Suppress_Options'Size + SU - 1) / SU);
 301       Tree_Write_Bool (Verbose_Mode);
 302       Tree_Write_Data (Warning_Mode'Address,
 303                        (Warning_Mode'Size + SU - 1) / Storage_Unit);
 304       Tree_Write_Int  (Ada_Version_Type'Pos (Ada_Version_Config));
 305       Tree_Write_Int  (Ada_Version_Type'Pos (Ada_Version_Explicit_Config));
 306       Tree_Write_Int  (Boolean'Pos (Assertions_Enabled_Config));
 307       Tree_Write_Bool (All_Errors_Mode);
 308       Tree_Write_Bool (Assertions_Enabled);
 309       Tree_Write_Int  (Int (Check_Policy_List));
 310       Tree_Write_Bool (Debug_Pragmas_Enabled);
 311       Tree_Write_Int  (Int (Default_Pool));
 312       Tree_Write_Bool (Enable_Overflow_Checks);
 313       Tree_Write_Bool (Full_List);
 314       Tree_Write_Int  (Int (Version_String'Length));
 315       Tree_Write_Data (Version_String'Address, Version_String'Length);
 316       Tree_Write_Data (Distribution_Stub_Mode'Address,
 317                        (Distribution_Stub_Mode'Size + SU - 1) / SU);
 318       Tree_Write_Bool (Inline_Active);
 319       Tree_Write_Bool (Inline_Processing_Required);
 320       Tree_Write_Bool (List_Units);
 321       Tree_Write_Bool (Configurable_Run_Time_Mode);
 322       Tree_Write_Data (Operating_Mode'Address,
 323                        (Operating_Mode'Size + SU - 1) / SU);
 324       Tree_Write_Bool (Suppress_Checks);
 325       Tree_Write_Bool (Try_Semantics);
 326       Tree_Write_Data (Wide_Character_Encoding_Method'Address,
 327                        (Wide_Character_Encoding_Method'Size + SU - 1) / SU);
 328       Tree_Write_Bool (Upper_Half_Encoding);
 329       Tree_Write_Bool (Force_ALI_Tree_File);
 330    end Tree_Write;
 331
 332 end Opt;