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) 1992-2014, 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_Pragma_Config             := Ada_Version_Pragma;
  49       Ada_Version_Explicit_Config           := Ada_Version_Explicit;
  50       Assertions_Enabled_Config             := Assertions_Enabled;
  51       Assume_No_Invalid_Values_Config       := Assume_No_Invalid_Values;
  52       Check_Float_Overflow_Config           := Check_Float_Overflow;
  53       Check_Policy_List_Config              := Check_Policy_List;
  54       Default_Pool_Config                   := Default_Pool;
  55       Dynamic_Elaboration_Checks_Config     := Dynamic_Elaboration_Checks;
  56       Exception_Locations_Suppressed_Config := Exception_Locations_Suppressed;
  57       Extensions_Allowed_Config             := Extensions_Allowed;
  58       External_Name_Exp_Casing_Config       := External_Name_Exp_Casing;
  59       External_Name_Imp_Casing_Config       := External_Name_Imp_Casing;
  60       Fast_Math_Config                      := Fast_Math;
  61       Initialize_Scalars_Config             := Initialize_Scalars;
  62       Optimize_Alignment_Config             := Optimize_Alignment;
  63       Persistent_BSS_Mode_Config            := Persistent_BSS_Mode;
  64       Polling_Required_Config               := Polling_Required;
  65       Short_Descriptors_Config              := Short_Descriptors;
  66       SPARK_Mode_Config                     := SPARK_Mode;
  67       SPARK_Mode_Pragma_Config              := SPARK_Mode_Pragma;
  68       Uneval_Old_Config                     := Uneval_Old;
  69       Use_VADS_Size_Config                  := Use_VADS_Size;
  70       Warnings_As_Errors_Count_Config       := Warnings_As_Errors_Count;
  71
  72       --  Reset the indication that Optimize_Alignment was set locally, since
  73       --  if we had a pragma in the config file, it would set this flag True,
  74       --  but that's not a local setting.
  75
  76       Optimize_Alignment_Local := False;
  77    end Register_Opt_Config_Switches;
  78
  79    ---------------------------------
  80    -- Restore_Opt_Config_Switches --
  81    ---------------------------------
  82
  83    procedure Restore_Opt_Config_Switches (Save : Config_Switches_Type) is
  84    begin
  85       Ada_Version                    := Save.Ada_Version;
  86       Ada_Version_Pragma             := Save.Ada_Version_Pragma;
  87       Ada_Version_Explicit           := Save.Ada_Version_Explicit;
  88       Assertions_Enabled             := Save.Assertions_Enabled;
  89       Assume_No_Invalid_Values       := Save.Assume_No_Invalid_Values;
  90       Check_Float_Overflow           := Save.Check_Float_Overflow;
  91       Check_Policy_List              := Save.Check_Policy_List;
  92       Default_Pool                   := Save.Default_Pool;
  93       Dynamic_Elaboration_Checks     := Save.Dynamic_Elaboration_Checks;
  94       Exception_Locations_Suppressed := Save.Exception_Locations_Suppressed;
  95       Extensions_Allowed             := Save.Extensions_Allowed;
  96       External_Name_Exp_Casing       := Save.External_Name_Exp_Casing;
  97       External_Name_Imp_Casing       := Save.External_Name_Imp_Casing;
  98       Fast_Math                      := Save.Fast_Math;
  99       Initialize_Scalars             := Save.Initialize_Scalars;
 100       Optimize_Alignment             := Save.Optimize_Alignment;
 101       Optimize_Alignment_Local       := Save.Optimize_Alignment_Local;
 102       Persistent_BSS_Mode            := Save.Persistent_BSS_Mode;
 103       Polling_Required               := Save.Polling_Required;
 104       Short_Descriptors              := Save.Short_Descriptors;
 105       SPARK_Mode                     := Save.SPARK_Mode;
 106       SPARK_Mode_Pragma              := Save.SPARK_Mode_Pragma;
 107       Uneval_Old                     := Save.Uneval_Old;
 108       Use_VADS_Size                  := Save.Use_VADS_Size;
 109       Warnings_As_Errors_Count       := Save.Warnings_As_Errors_Count;
 110
 111       --  Update consistently the value of Init_Or_Norm_Scalars. The value of
 112       --  Normalize_Scalars is not saved/restored because after set to True its
 113       --  value is never changed. That is, if a compilation unit has pragma
 114       --  Normalize_Scalars then it forces that value for all with'ed units.
 115
 116       Init_Or_Norm_Scalars := Initialize_Scalars or Normalize_Scalars;
 117    end Restore_Opt_Config_Switches;
 118
 119    ------------------------------
 120    -- Save_Opt_Config_Switches --
 121    ------------------------------
 122
 123    procedure Save_Opt_Config_Switches (Save : out Config_Switches_Type) is
 124    begin
 125       Save.Ada_Version                    := Ada_Version;
 126       Save.Ada_Version_Pragma             := Ada_Version_Pragma;
 127       Save.Ada_Version_Explicit           := Ada_Version_Explicit;
 128       Save.Assertions_Enabled             := Assertions_Enabled;
 129       Save.Assume_No_Invalid_Values       := Assume_No_Invalid_Values;
 130       Save.Check_Float_Overflow           := Check_Float_Overflow;
 131       Save.Check_Policy_List              := Check_Policy_List;
 132       Save.Default_Pool                   := Default_Pool;
 133       Save.Dynamic_Elaboration_Checks     := Dynamic_Elaboration_Checks;
 134       Save.Exception_Locations_Suppressed := Exception_Locations_Suppressed;
 135       Save.Extensions_Allowed             := Extensions_Allowed;
 136       Save.External_Name_Exp_Casing       := External_Name_Exp_Casing;
 137       Save.External_Name_Imp_Casing       := External_Name_Imp_Casing;
 138       Save.Fast_Math                      := Fast_Math;
 139       Save.Initialize_Scalars             := Initialize_Scalars;
 140       Save.Optimize_Alignment             := Optimize_Alignment;
 141       Save.Optimize_Alignment_Local       := Optimize_Alignment_Local;
 142       Save.Persistent_BSS_Mode            := Persistent_BSS_Mode;
 143       Save.Polling_Required               := Polling_Required;
 144       Save.Short_Descriptors              := Short_Descriptors;
 145       Save.SPARK_Mode                     := SPARK_Mode;
 146       Save.SPARK_Mode_Pragma              := SPARK_Mode_Pragma;
 147       Save.Uneval_Old                     := Uneval_Old;
 148       Save.Use_VADS_Size                  := Use_VADS_Size;
 149       Save.Warnings_As_Errors_Count       := Warnings_As_Errors_Count;
 150    end Save_Opt_Config_Switches;
 151
 152    -----------------------------
 153    -- Set_Opt_Config_Switches --
 154    -----------------------------
 155
 156    procedure Set_Opt_Config_Switches
 157      (Internal_Unit : Boolean;
 158       Main_Unit     : Boolean)
 159    is
 160    begin
 161       --  Case of internal unit
 162
 163       if Internal_Unit then
 164
 165          --  Set standard switches. Note we do NOT set Ada_Version_Explicit
 166          --  since the whole point of this is that it still properly indicates
 167          --  the configuration setting even in a run time unit.
 168
 169          Ada_Version                 := Ada_Version_Runtime;
 170          Ada_Version_Pragma          := Empty;
 171          Dynamic_Elaboration_Checks  := False;
 172          Extensions_Allowed          := True;
 173          External_Name_Exp_Casing    := As_Is;
 174          External_Name_Imp_Casing    := Lowercase;
 175          Optimize_Alignment          := 'O';
 176          Persistent_BSS_Mode         := False;
 177          Uneval_Old                  := 'E';
 178          Use_VADS_Size               := False;
 179          Optimize_Alignment_Local    := True;
 180
 181          --  Note: we do not need to worry about Warnings_As_Errors_Count since
 182          --  we do not expect to get any warnings from compiling such a unit.
 183
 184          --  For an internal unit, assertions/debug pragmas are off unless this
 185          --  is the main unit and they were explicitly enabled. We also make
 186          --  sure we do not assume that values are necessarily valid and that
 187          --  SPARK_Mode is set to its configuration value.
 188
 189          if Main_Unit then
 190             Assertions_Enabled       := Assertions_Enabled_Config;
 191             Assume_No_Invalid_Values := Assume_No_Invalid_Values_Config;
 192             Check_Policy_List        := Check_Policy_List_Config;
 193             SPARK_Mode               := SPARK_Mode_Config;
 194             SPARK_Mode_Pragma        := SPARK_Mode_Pragma_Config;
 195          else
 196             Assertions_Enabled       := False;
 197             Assume_No_Invalid_Values := False;
 198             Check_Policy_List        := Empty;
 199             SPARK_Mode               := None;
 200             SPARK_Mode_Pragma        := Empty;
 201          end if;
 202
 203       --  Case of non-internal unit
 204
 205       else
 206          Ada_Version                 := Ada_Version_Config;
 207          Ada_Version_Pragma          := Ada_Version_Pragma_Config;
 208          Ada_Version_Explicit        := Ada_Version_Explicit_Config;
 209          Assertions_Enabled          := Assertions_Enabled_Config;
 210          Assume_No_Invalid_Values    := Assume_No_Invalid_Values_Config;
 211          Check_Float_Overflow        := Check_Float_Overflow_Config;
 212          Check_Policy_List           := Check_Policy_List_Config;
 213          Dynamic_Elaboration_Checks  := Dynamic_Elaboration_Checks_Config;
 214          Extensions_Allowed          := Extensions_Allowed_Config;
 215          External_Name_Exp_Casing    := External_Name_Exp_Casing_Config;
 216          External_Name_Imp_Casing    := External_Name_Imp_Casing_Config;
 217          Fast_Math                   := Fast_Math_Config;
 218          Initialize_Scalars          := Initialize_Scalars_Config;
 219          Optimize_Alignment          := Optimize_Alignment_Config;
 220          Optimize_Alignment_Local    := False;
 221          Persistent_BSS_Mode         := Persistent_BSS_Mode_Config;
 222          SPARK_Mode                  := SPARK_Mode_Config;
 223          SPARK_Mode_Pragma           := SPARK_Mode_Pragma_Config;
 224          Uneval_Old                  := Uneval_Old_Config;
 225          Use_VADS_Size               := Use_VADS_Size_Config;
 226          Warnings_As_Errors_Count    := Warnings_As_Errors_Count_Config;
 227
 228          --  Update consistently the value of Init_Or_Norm_Scalars. The value
 229          --  of Normalize_Scalars is not saved/restored because once set to
 230          --  True its value is never changed. That is, if a compilation unit
 231          --  has pragma Normalize_Scalars then it forces that value for all
 232          --  with'ed units.
 233
 234          Init_Or_Norm_Scalars := Initialize_Scalars or Normalize_Scalars;
 235       end if;
 236
 237       Default_Pool                   := Default_Pool_Config;
 238       Exception_Locations_Suppressed := Exception_Locations_Suppressed_Config;
 239       Fast_Math                      := Fast_Math_Config;
 240       Optimize_Alignment             := Optimize_Alignment_Config;
 241       Polling_Required               := Polling_Required_Config;
 242       Short_Descriptors              := Short_Descriptors_Config;
 243    end Set_Opt_Config_Switches;
 244
 245    ---------------
 246    -- Tree_Read --
 247    ---------------
 248
 249    procedure Tree_Read is
 250       Tree_Version_String_Len         : Nat;
 251       Ada_Version_Config_Val          : Nat;
 252       Ada_Version_Explicit_Config_Val : Nat;
 253       Assertions_Enabled_Config_Val   : Nat;
 254
 255    begin
 256       Tree_Read_Int  (Tree_ASIS_Version_Number);
 257
 258       Tree_Read_Bool (Address_Is_Private);
 259       Tree_Read_Bool (Brief_Output);
 260       Tree_Read_Bool (GNAT_Mode);
 261       Tree_Read_Char (Identifier_Character_Set);
 262       Tree_Read_Bool (Ignore_Rep_Clauses);
 263       Tree_Read_Bool (Ignore_Style_Checks_Pragmas);
 264       Tree_Read_Int  (Maximum_File_Name_Length);
 265       Tree_Read_Data (Suppress_Options'Address,
 266                       (Suppress_Options'Size + SU - 1) / SU);
 267       Tree_Read_Bool (Verbose_Mode);
 268       Tree_Read_Data (Warning_Mode'Address,
 269                       (Warning_Mode'Size + SU - 1) / SU);
 270       Tree_Read_Int  (Ada_Version_Config_Val);
 271       Tree_Read_Int  (Ada_Version_Explicit_Config_Val);
 272       Tree_Read_Int  (Assertions_Enabled_Config_Val);
 273       Tree_Read_Bool (All_Errors_Mode);
 274       Tree_Read_Bool (Assertions_Enabled);
 275       Tree_Read_Bool (Check_Float_Overflow);
 276       Tree_Read_Int  (Int (Check_Policy_List));
 277       Tree_Read_Int  (Int (Default_Pool));
 278       Tree_Read_Bool (Full_List);
 279
 280       Ada_Version_Config :=
 281         Ada_Version_Type'Val (Ada_Version_Config_Val);
 282       Ada_Version_Explicit_Config :=
 283         Ada_Version_Type'Val (Ada_Version_Explicit_Config_Val);
 284       Assertions_Enabled_Config :=
 285         Boolean'Val (Assertions_Enabled_Config_Val);
 286
 287       --  Read version string: we have to get the length first
 288
 289       Tree_Read_Int (Tree_Version_String_Len);
 290
 291       declare
 292          Tmp : String (1 .. Integer (Tree_Version_String_Len));
 293       begin
 294          Tree_Read_Data
 295            (Tmp'Address, Tree_Version_String_Len);
 296          System.Strings.Free (Tree_Version_String);
 297          Free (Tree_Version_String);
 298          Tree_Version_String := new String'(Tmp);
 299       end;
 300
 301       Tree_Read_Data (Distribution_Stub_Mode'Address,
 302                       (Distribution_Stub_Mode'Size + SU - 1) / Storage_Unit);
 303       Tree_Read_Bool (Inline_Active);
 304       Tree_Read_Bool (Inline_Processing_Required);
 305       Tree_Read_Bool (List_Units);
 306       Tree_Read_Int  (Multiple_Unit_Index);
 307       Tree_Read_Bool (Configurable_Run_Time_Mode);
 308       Tree_Read_Data (Operating_Mode'Address,
 309                       (Operating_Mode'Size + SU - 1) / Storage_Unit);
 310       Tree_Read_Bool (Suppress_Checks);
 311       Tree_Read_Bool (Try_Semantics);
 312       Tree_Read_Data (Wide_Character_Encoding_Method'Address,
 313                       (Wide_Character_Encoding_Method'Size + SU - 1) / SU);
 314       Tree_Read_Bool (Upper_Half_Encoding);
 315       Tree_Read_Bool (Force_ALI_Tree_File);
 316    end Tree_Read;
 317
 318    ----------------
 319    -- Tree_Write --
 320    ----------------
 321
 322    procedure Tree_Write is
 323       Version_String : String := Gnat_Version_String;
 324
 325    begin
 326       Tree_Write_Int  (ASIS_Version_Number);
 327
 328       Tree_Write_Bool (Address_Is_Private);
 329       Tree_Write_Bool (Brief_Output);
 330       Tree_Write_Bool (GNAT_Mode);
 331       Tree_Write_Char (Identifier_Character_Set);
 332       Tree_Write_Bool (Ignore_Rep_Clauses);
 333       Tree_Write_Bool (Ignore_Style_Checks_Pragmas);
 334       Tree_Write_Int  (Maximum_File_Name_Length);
 335       Tree_Write_Data (Suppress_Options'Address,
 336                        (Suppress_Options'Size + SU - 1) / SU);
 337       Tree_Write_Bool (Verbose_Mode);
 338       Tree_Write_Data (Warning_Mode'Address,
 339                        (Warning_Mode'Size + SU - 1) / Storage_Unit);
 340       Tree_Write_Int  (Ada_Version_Type'Pos (Ada_Version_Config));
 341       Tree_Write_Int  (Ada_Version_Type'Pos (Ada_Version_Explicit_Config));
 342       Tree_Write_Int  (Boolean'Pos (Assertions_Enabled_Config));
 343       Tree_Write_Bool (All_Errors_Mode);
 344       Tree_Write_Bool (Assertions_Enabled);
 345       Tree_Write_Bool (Check_Float_Overflow);
 346       Tree_Write_Int  (Int (Check_Policy_List));
 347       Tree_Write_Int  (Int (Default_Pool));
 348       Tree_Write_Bool (Full_List);
 349       Tree_Write_Int  (Int (Version_String'Length));
 350       Tree_Write_Data (Version_String'Address, Version_String'Length);
 351       Tree_Write_Data (Distribution_Stub_Mode'Address,
 352                        (Distribution_Stub_Mode'Size + SU - 1) / SU);
 353       Tree_Write_Bool (Inline_Active);
 354       Tree_Write_Bool (Inline_Processing_Required);
 355       Tree_Write_Bool (List_Units);
 356       Tree_Write_Int  (Multiple_Unit_Index);
 357       Tree_Write_Bool (Configurable_Run_Time_Mode);
 358       Tree_Write_Data (Operating_Mode'Address,
 359                        (Operating_Mode'Size + SU - 1) / SU);
 360       Tree_Write_Bool (Suppress_Checks);
 361       Tree_Write_Bool (Try_Semantics);
 362       Tree_Write_Data (Wide_Character_Encoding_Method'Address,
 363                        (Wide_Character_Encoding_Method'Size + SU - 1) / SU);
 364       Tree_Write_Bool (Upper_Half_Encoding);
 365       Tree_Write_Bool (Force_ALI_Tree_File);
 366    end Tree_Write;
 367
 368 end Opt;