gcc/ada/system-mingw.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                        GNAT RUN-TIME COMPONENTS                          --
   4 --                                                                          --
   5 --                               S Y S T E M                                --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                            (Windows Version)                             --
   9 --                                                                          --
  10 --          Copyright (C) 1992-2008, Free Software Foundation, Inc.         --
  11 --                                                                          --
  12 -- This specification is derived from the Ada Reference Manual for use with --
  13 -- GNAT. The copyright notice above, and the license provisions that follow --
  14 -- apply solely to the  contents of the part following the private keyword. --
  15 --                                                                          --
  16 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  17 -- terms of the  GNU General Public License as published  by the Free Soft- --
  18 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  19 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  20 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  21 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  22 -- for  more details.  You should have  received  a copy of the GNU General --
  23 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  24 -- to  the  Free Software Foundation,  51  Franklin  Street,  Fifth  Floor, --
  25 -- Boston, MA 02110-1301, USA.                                              --
  26 --                                                                          --
  27 -- As a special exception,  if other files  instantiate  generics from this --
  28 -- unit, or you link  this unit with other files  to produce an executable, --
  29 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  30 -- covered  by the  GNU  General  Public  License.  This exception does not --
  31 -- however invalidate  any other reasons why  the executable file  might be --
  32 -- covered by the  GNU Public License.                                      --
  33 --                                                                          --
  34 -- GNAT was originally developed  by the GNAT team at  New York University. --
  35 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  36 --                                                                          --
  37 ------------------------------------------------------------------------------
  38
  39 package System is
  40    pragma Pure;
  41    --  Note that we take advantage of the implementation permission to make
  42    --  this unit Pure instead of Preelaborable; see RM 13.7.1(15). In Ada
  43    --  2005, this is Pure in any case (AI-362).
  44
  45    type Name is (SYSTEM_NAME_GNAT);
  46    System_Name : constant Name := SYSTEM_NAME_GNAT;
  47
  48    --  System-Dependent Named Numbers
  49
  50    Min_Int               : constant := Long_Long_Integer'First;
  51    Max_Int               : constant := Long_Long_Integer'Last;
  52
  53    Max_Binary_Modulus    : constant := 2 ** Long_Long_Integer'Size;
  54    Max_Nonbinary_Modulus : constant := 2 ** Integer'Size - 1;
  55
  56    Max_Base_Digits       : constant := Long_Long_Float'Digits;
  57    Max_Digits            : constant := Long_Long_Float'Digits;
  58
  59    Max_Mantissa          : constant := 63;
  60    Fine_Delta            : constant := 2.0 ** (-Max_Mantissa);
  61
  62    Tick                  : constant := 0.01;
  63
  64    --  Storage-related Declarations
  65
  66    type Address is private;
  67    pragma Preelaborable_Initialization (Address);
  68    Null_Address : constant Address;
  69
  70    Storage_Unit : constant := 8;
  71    Word_Size    : constant := 32;
  72    Memory_Size  : constant := 2 ** 32;
  73
  74    --  Address comparison
  75
  76    function "<"  (Left, Right : Address) return Boolean;
  77    function "<=" (Left, Right : Address) return Boolean;
  78    function ">"  (Left, Right : Address) return Boolean;
  79    function ">=" (Left, Right : Address) return Boolean;
  80    function "="  (Left, Right : Address) return Boolean;
  81
  82    pragma Import (Intrinsic, "<");
  83    pragma Import (Intrinsic, "<=");
  84    pragma Import (Intrinsic, ">");
  85    pragma Import (Intrinsic, ">=");
  86    pragma Import (Intrinsic, "=");
  87
  88    --  Other System-Dependent Declarations
  89
  90    type Bit_Order is (High_Order_First, Low_Order_First);
  91    Default_Bit_Order : constant Bit_Order := Low_Order_First;
  92    pragma Warnings (Off, Default_Bit_Order); -- kill constant condition warning
  93
  94    --  Priority-related Declarations (RM D.1)
  95
  96    Max_Priority           : constant Positive := 30;
  97    Max_Interrupt_Priority : constant Positive := 31;
  98
  99    subtype Any_Priority       is Integer      range  0 .. 31;
 100    subtype Priority           is Any_Priority range  0 .. 30;
 101    subtype Interrupt_Priority is Any_Priority range 31 .. 31;
 102
 103    Default_Priority : constant Priority := 15;
 104
 105 private
 106
 107    type Address is mod Memory_Size;
 108    Null_Address : constant Address := 0;
 109
 110    --------------------------------------
 111    -- System Implementation Parameters --
 112    --------------------------------------
 113
 114    --  These parameters provide information about the target that is used
 115    --  by the compiler. They are in the private part of System, where they
 116    --  can be accessed using the special circuitry in the Targparm unit
 117    --  whose source should be consulted for more detailed descriptions
 118    --  of the individual switch values.
 119
 120    Backend_Divide_Checks     : constant Boolean := False;
 121    Backend_Overflow_Checks   : constant Boolean := False;
 122    Command_Line_Args         : constant Boolean := True;
 123    Configurable_Run_Time     : constant Boolean := False;
 124    Denorm                    : constant Boolean := True;
 125    Duration_32_Bits          : constant Boolean := False;
 126    Exit_Status_Supported     : constant Boolean := True;
 127    Fractional_Fixed_Ops      : constant Boolean := False;
 128    Frontend_Layout           : constant Boolean := False;
 129    Machine_Overflows         : constant Boolean := False;
 130    Machine_Rounds            : constant Boolean := True;
 131    Preallocated_Stacks       : constant Boolean := False;
 132    Signed_Zeros              : constant Boolean := True;
 133    Stack_Check_Default       : constant Boolean := False;
 134    Stack_Check_Probes        : constant Boolean := True;
 135    Stack_Check_Limits        : constant Boolean := False;
 136    Support_64_Bit_Divides    : constant Boolean := True;
 137    Support_Aggregates        : constant Boolean := True;
 138    Support_Composite_Assign  : constant Boolean := True;
 139    Support_Composite_Compare : constant Boolean := True;
 140    Support_Long_Shifts       : constant Boolean := True;
 141    Always_Compatible_Rep     : constant Boolean := False;
 142    Suppress_Standard_Library : constant Boolean := False;
 143    Use_Ada_Main_Program_Name : constant Boolean := False;
 144    ZCX_By_Default            : constant Boolean := False;
 145    GCC_ZCX_Support           : constant Boolean := True;
 146
 147    ---------------------------
 148    -- Underlying Priorities --
 149    ---------------------------
 150
 151    --  Important note: this section of the file must come AFTER the
 152    --  definition of the system implementation parameters to ensure
 153    --  that the value of these parameters is available for analysis
 154    --  of the declarations here (using Rtsfind at compile time).
 155
 156    --  The underlying priorities table provides a generalized mechanism
 157    --  for mapping from Ada priorities to system priorities. In some
 158    --  cases a 1-1 mapping is not the convenient or optimal choice.
 159
 160    type Priorities_Mapping is array (Any_Priority) of Integer;
 161    pragma Suppress_Initialization (Priorities_Mapping);
 162    --  Suppress initialization in case gnat.adc specifies Normalize_Scalars
 163
 164    Underlying_Priorities : constant Priorities_Mapping :=
 165      (Priority'First ..
 166       Default_Priority - 8    => -15,
 167       Default_Priority - 7    => -7,
 168       Default_Priority - 6    => -6,
 169       Default_Priority - 5    => -5,
 170       Default_Priority - 4    => -4,
 171       Default_Priority - 3    => -3,
 172       Default_Priority - 2    => -2,
 173       Default_Priority - 1    => -1,
 174       Default_Priority        => 0,
 175       Default_Priority + 1    => 1,
 176       Default_Priority + 2    => 2,
 177       Default_Priority + 3    => 3,
 178       Default_Priority + 4    => 4,
 179       Default_Priority + 5    => 5,
 180       Default_Priority + 6 ..
 181       Priority'Last           => 6,
 182       Interrupt_Priority      => 15);
 183    --  The default mapping preserves the standard 31 priorities of the Ada
 184    --  model, but maps them using compression onto the 7 priority levels
 185    --  available in NT and on the 16 priority levels available in 2000/XP.
 186
 187    --  To replace the default values of the Underlying_Priorities mapping,
 188    --  copy this source file into your build directory, edit the file to
 189    --  reflect your desired behavior, and recompile using Makefile.adalib
 190    --  which can be found under the adalib directory of your gnat installation
 191
 192    pragma Linker_Options ("-Wl,--stack=0x2000000");
 193    --  This is used to change the default stack (32 MB) size for non tasking
 194    --  programs. We change this value for GNAT on Windows here because the
 195    --  binutils on this platform have switched to a too low value for Ada
 196    --  programs. Note that we also set the stack size for tasking programs in
 197    --  System.Task_Primitives.Operations.
 198
 199 end System;