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) 1992-2013, 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    -- Full_Expander_Active --
  43    --------------------------
  44
  45    function Full_Expander_Active return Boolean is
  46    begin
  47       return Expander_Active and not SPARK_Mode;
  48    end Full_Expander_Active;
  49
  50    ----------------------------------
  51    -- Register_Opt_Config_Switches --
  52    ----------------------------------
  53
  54    procedure Register_Opt_Config_Switches is
  55    begin
  56       Ada_Version_Config                    := Ada_Version;
  57       Ada_Version_Explicit_Config           := Ada_Version_Explicit;
  58       Assertions_Enabled_Config             := Assertions_Enabled;
  59       Assume_No_Invalid_Values_Config       := Assume_No_Invalid_Values;
  60       Check_Float_Overflow_Config           := Check_Float_Overflow;
  61       Check_Policy_List_Config              := Check_Policy_List;
  62       Default_Pool_Config                   := Default_Pool;
  63       Dynamic_Elaboration_Checks_Config     := Dynamic_Elaboration_Checks;
  64       Exception_Locations_Suppressed_Config := Exception_Locations_Suppressed;
  65       Extensions_Allowed_Config             := Extensions_Allowed;
  66       External_Name_Exp_Casing_Config       := External_Name_Exp_Casing;
  67       External_Name_Imp_Casing_Config       := External_Name_Imp_Casing;
  68       Fast_Math_Config                      := Fast_Math;
  69       Initialize_Scalars_Config             := Initialize_Scalars;
  70       Optimize_Alignment_Config             := Optimize_Alignment;
  71       Persistent_BSS_Mode_Config            := Persistent_BSS_Mode;
  72       Polling_Required_Config               := Polling_Required;
  73       Short_Descriptors_Config              := Short_Descriptors;
  74       Use_VADS_Size_Config                  := Use_VADS_Size;
  75
  76       --  Reset the indication that Optimize_Alignment was set locally, since
  77       --  if we had a pragma in the config file, it would set this flag True,
  78       --  but that's not a local setting.
  79
  80       Optimize_Alignment_Local := False;
  81    end Register_Opt_Config_Switches;
  82
  83    ---------------------------------
  84    -- Restore_Opt_Config_Switches --
  85    ---------------------------------
  86
  87    procedure Restore_Opt_Config_Switches (Save : Config_Switches_Type) is
  88    begin
  89       Ada_Version                    := Save.Ada_Version;
  90       Ada_Version_Explicit           := Save.Ada_Version_Explicit;
  91       Assertions_Enabled             := Save.Assertions_Enabled;
  92       Assume_No_Invalid_Values       := Save.Assume_No_Invalid_Values;
  93       Check_Float_Overflow           := Save.Check_Float_Overflow;
  94       Check_Policy_List              := Save.Check_Policy_List;
  95       Default_Pool                   := Save.Default_Pool;
  96       Dynamic_Elaboration_Checks     := Save.Dynamic_Elaboration_Checks;
  97       Exception_Locations_Suppressed := Save.Exception_Locations_Suppressed;
  98       Extensions_Allowed             := Save.Extensions_Allowed;
  99       External_Name_Exp_Casing       := Save.External_Name_Exp_Casing;
 100       External_Name_Imp_Casing       := Save.External_Name_Imp_Casing;
 101       Fast_Math                      := Save.Fast_Math;
 102       Initialize_Scalars             := Save.Initialize_Scalars;
 103       Optimize_Alignment             := Save.Optimize_Alignment;
 104       Optimize_Alignment_Local       := Save.Optimize_Alignment_Local;
 105       Persistent_BSS_Mode            := Save.Persistent_BSS_Mode;
 106       Polling_Required               := Save.Polling_Required;
 107       Short_Descriptors              := Save.Short_Descriptors;
 108       Use_VADS_Size                  := Save.Use_VADS_Size;
 109
 110       --  Update consistently the value of Init_Or_Norm_Scalars. The value of
 111       --  Normalize_Scalars is not saved/restored because after set to True its
 112       --  value is never changed. That is, if a compilation unit has pragma
 113       --  Normalize_Scalars then it forces that value for all with'ed units.
 114
 115       Init_Or_Norm_Scalars := Initialize_Scalars or Normalize_Scalars;
 116    end Restore_Opt_Config_Switches;
 117
 118    ------------------------------
 119    -- Save_Opt_Config_Switches --
 120    ------------------------------
 121
 122    procedure Save_Opt_Config_Switches (Save : out Config_Switches_Type) is
 123    begin
 124       Save.Ada_Version                    := Ada_Version;
 125       Save.Ada_Version_Explicit           := Ada_Version_Explicit;
 126       Save.Assertions_Enabled             := Assertions_Enabled;
 127       Save.Assume_No_Invalid_Values       := Assume_No_Invalid_Values;
 128       Save.Check_Float_Overflow           := Check_Float_Overflow;
 129       Save.Check_Policy_List              := Check_Policy_List;
 130       Save.Default_Pool                   := Default_Pool;
 131       Save.Dynamic_Elaboration_Checks     := Dynamic_Elaboration_Checks;
 132       Save.Exception_Locations_Suppressed := Exception_Locations_Suppressed;
 133       Save.Extensions_Allowed             := Extensions_Allowed;
 134       Save.External_Name_Exp_Casing       := External_Name_Exp_Casing;
 135       Save.External_Name_Imp_Casing       := External_Name_Imp_Casing;
 136       Save.Fast_Math                      := Fast_Math;
 137       Save.Initialize_Scalars             := Initialize_Scalars;
 138       Save.Optimize_Alignment             := Optimize_Alignment;
 139       Save.Optimize_Alignment_Local       := Optimize_Alignment_Local;
 140       Save.Persistent_BSS_Mode            := Persistent_BSS_Mode;
 141       Save.Polling_Required               := Polling_Required;
 142       Save.Short_Descriptors              := Short_Descriptors;
 143       Save.Use_VADS_Size                  := Use_VADS_Size;
 144    end Save_Opt_Config_Switches;
 145
 146    -----------------------------
 147    -- Set_Opt_Config_Switches --
 148    -----------------------------
 149
 150    procedure Set_Opt_Config_Switches
 151      (Internal_Unit : Boolean;
 152       Main_Unit     : Boolean)
 153    is
 154    begin
 155       --  Case of internal unit
 156
 157       if Internal_Unit then
 158
 159          --  Set standard switches. Note we do NOT set Ada_Version_Explicit
 160          --  since the whole point of this is that it still properly indicates
 161          --  the configuration setting even in a run time unit.
 162
 163          Ada_Version                 := Ada_Version_Runtime;
 164          Dynamic_Elaboration_Checks  := False;
 165          Extensions_Allowed          := True;
 166          External_Name_Exp_Casing    := As_Is;
 167          External_Name_Imp_Casing    := Lowercase;
 168          Optimize_Alignment          := 'O';
 169          Persistent_BSS_Mode         := False;
 170          Use_VADS_Size               := False;
 171          Optimize_Alignment_Local    := True;
 172
 173          --  For an internal unit, assertions/debug pragmas are off unless this
 174          --  is the main unit and they were explicitly enabled. We also make
 175          --  sure we do not assume that values are necessarily valid.
 176
 177          if Main_Unit then
 178             Assertions_Enabled       := Assertions_Enabled_Config;
 179             Assume_No_Invalid_Values := Assume_No_Invalid_Values_Config;
 180             Check_Policy_List        := Check_Policy_List_Config;
 181          else
 182             Assertions_Enabled       := False;
 183             Assume_No_Invalid_Values := False;
 184             Check_Policy_List        := Empty;
 185          end if;
 186
 187       --  Case of non-internal unit
 188
 189       else
 190          Ada_Version                 := Ada_Version_Config;
 191          Ada_Version_Explicit        := Ada_Version_Explicit_Config;
 192          Assertions_Enabled          := Assertions_Enabled_Config;
 193          Assume_No_Invalid_Values    := Assume_No_Invalid_Values_Config;
 194          Check_Float_Overflow        := Check_Float_Overflow_Config;
 195          Check_Policy_List           := Check_Policy_List_Config;
 196          Dynamic_Elaboration_Checks  := Dynamic_Elaboration_Checks_Config;
 197          Extensions_Allowed          := Extensions_Allowed_Config;
 198          External_Name_Exp_Casing    := External_Name_Exp_Casing_Config;
 199          External_Name_Imp_Casing    := External_Name_Imp_Casing_Config;
 200          Fast_Math                   := Fast_Math_Config;
 201          Initialize_Scalars          := Initialize_Scalars_Config;
 202          Optimize_Alignment          := Optimize_Alignment_Config;
 203          Optimize_Alignment_Local    := False;
 204          Persistent_BSS_Mode         := Persistent_BSS_Mode_Config;
 205          Use_VADS_Size               := Use_VADS_Size_Config;
 206
 207          --  Update consistently the value of Init_Or_Norm_Scalars. The value
 208          --  of Normalize_Scalars is not saved/restored because once set to
 209          --  True its value is never changed. That is, if a compilation unit
 210          --  has pragma Normalize_Scalars then it forces that value for all
 211          --  with'ed units.
 212
 213          Init_Or_Norm_Scalars := Initialize_Scalars or Normalize_Scalars;
 214       end if;
 215
 216       Default_Pool                   := Default_Pool_Config;
 217       Exception_Locations_Suppressed := Exception_Locations_Suppressed_Config;
 218       Fast_Math                      := Fast_Math_Config;
 219       Optimize_Alignment             := Optimize_Alignment_Config;
 220       Polling_Required               := Polling_Required_Config;
 221       Short_Descriptors              := Short_Descriptors_Config;
 222    end Set_Opt_Config_Switches;
 223
 224    ---------------
 225    -- Tree_Read --
 226    ---------------
 227
 228    procedure Tree_Read is
 229       Tree_Version_String_Len         : Nat;
 230       Ada_Version_Config_Val          : Nat;
 231       Ada_Version_Explicit_Config_Val : Nat;
 232       Assertions_Enabled_Config_Val   : Nat;
 233
 234    begin
 235       Tree_Read_Int  (Tree_ASIS_Version_Number);
 236       Tree_Read_Bool (Brief_Output);
 237       Tree_Read_Bool (GNAT_Mode);
 238       Tree_Read_Char (Identifier_Character_Set);
 239       Tree_Read_Int  (Maximum_File_Name_Length);
 240       Tree_Read_Data (Suppress_Options'Address,
 241                       (Suppress_Options'Size + SU - 1) / SU);
 242       Tree_Read_Bool (Verbose_Mode);
 243       Tree_Read_Data (Warning_Mode'Address,
 244                       (Warning_Mode'Size + SU - 1) / SU);
 245       Tree_Read_Int  (Ada_Version_Config_Val);
 246       Tree_Read_Int  (Ada_Version_Explicit_Config_Val);
 247       Tree_Read_Int  (Assertions_Enabled_Config_Val);
 248       Tree_Read_Bool (All_Errors_Mode);
 249       Tree_Read_Bool (Assertions_Enabled);
 250       Tree_Read_Bool (Check_Float_Overflow);
 251       Tree_Read_Int  (Int (Check_Policy_List));
 252       Tree_Read_Int  (Int (Default_Pool));
 253       Tree_Read_Bool (Full_List);
 254
 255       Ada_Version_Config :=
 256         Ada_Version_Type'Val (Ada_Version_Config_Val);
 257       Ada_Version_Explicit_Config :=
 258         Ada_Version_Type'Val (Ada_Version_Explicit_Config_Val);
 259       Assertions_Enabled_Config :=
 260         Boolean'Val (Assertions_Enabled_Config_Val);
 261
 262       --  Read version string: we have to get the length first
 263
 264       Tree_Read_Int (Tree_Version_String_Len);
 265
 266       declare
 267          Tmp : String (1 .. Integer (Tree_Version_String_Len));
 268       begin
 269          Tree_Read_Data
 270            (Tmp'Address, Tree_Version_String_Len);
 271          System.Strings.Free (Tree_Version_String);
 272          Free (Tree_Version_String);
 273          Tree_Version_String := new String'(Tmp);
 274       end;
 275
 276       Tree_Read_Data (Distribution_Stub_Mode'Address,
 277                       (Distribution_Stub_Mode'Size + SU - 1) / Storage_Unit);
 278       Tree_Read_Bool (Inline_Active);
 279       Tree_Read_Bool (Inline_Processing_Required);
 280       Tree_Read_Bool (List_Units);
 281       Tree_Read_Bool (Configurable_Run_Time_Mode);
 282       Tree_Read_Data (Operating_Mode'Address,
 283                       (Operating_Mode'Size + SU - 1) / Storage_Unit);
 284       Tree_Read_Bool (Suppress_Checks);
 285       Tree_Read_Bool (Try_Semantics);
 286       Tree_Read_Data (Wide_Character_Encoding_Method'Address,
 287                       (Wide_Character_Encoding_Method'Size + SU - 1) / SU);
 288       Tree_Read_Bool (Upper_Half_Encoding);
 289       Tree_Read_Bool (Force_ALI_Tree_File);
 290    end Tree_Read;
 291
 292    ----------------
 293    -- Tree_Write --
 294    ----------------
 295
 296    procedure Tree_Write is
 297       Version_String : String := Gnat_Version_String;
 298
 299    begin
 300       Tree_Write_Int  (ASIS_Version_Number);
 301       Tree_Write_Bool (Brief_Output);
 302       Tree_Write_Bool (GNAT_Mode);
 303       Tree_Write_Char (Identifier_Character_Set);
 304       Tree_Write_Int  (Maximum_File_Name_Length);
 305       Tree_Write_Data (Suppress_Options'Address,
 306                        (Suppress_Options'Size + SU - 1) / SU);
 307       Tree_Write_Bool (Verbose_Mode);
 308       Tree_Write_Data (Warning_Mode'Address,
 309                        (Warning_Mode'Size + SU - 1) / Storage_Unit);
 310       Tree_Write_Int  (Ada_Version_Type'Pos (Ada_Version_Config));
 311       Tree_Write_Int  (Ada_Version_Type'Pos (Ada_Version_Explicit_Config));
 312       Tree_Write_Int  (Boolean'Pos (Assertions_Enabled_Config));
 313       Tree_Write_Bool (All_Errors_Mode);
 314       Tree_Write_Bool (Assertions_Enabled);
 315       Tree_Write_Bool (Check_Float_Overflow);
 316       Tree_Write_Int  (Int (Check_Policy_List));
 317       Tree_Write_Int  (Int (Default_Pool));
 318       Tree_Write_Bool (Full_List);
 319       Tree_Write_Int  (Int (Version_String'Length));
 320       Tree_Write_Data (Version_String'Address, Version_String'Length);
 321       Tree_Write_Data (Distribution_Stub_Mode'Address,
 322                        (Distribution_Stub_Mode'Size + SU - 1) / SU);
 323       Tree_Write_Bool (Inline_Active);
 324       Tree_Write_Bool (Inline_Processing_Required);
 325       Tree_Write_Bool (List_Units);
 326       Tree_Write_Bool (Configurable_Run_Time_Mode);
 327       Tree_Write_Data (Operating_Mode'Address,
 328                        (Operating_Mode'Size + SU - 1) / SU);
 329       Tree_Write_Bool (Suppress_Checks);
 330       Tree_Write_Bool (Try_Semantics);
 331       Tree_Write_Data (Wide_Character_Encoding_Method'Address,
 332                        (Wide_Character_Encoding_Method'Size + SU - 1) / SU);
 333       Tree_Write_Bool (Upper_Half_Encoding);
 334       Tree_Write_Bool (Force_ALI_Tree_File);
 335    end Tree_Write;
 336
 337 end Opt;