gcc/ada/system-darwin-ppc.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                        GNAT RUN-TIME COMPONENTS                          --
   4 --                                                                          --
   5 --                               S Y S T E M                                --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                          (Darwin/PPC Version)                            --
   9 --                                                                          --
  10 --          Copyright (C) 1992-2004 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,  59 Temple Place - Suite 330,  Boston, --
  25 -- MA 02111-1307, 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 (System);
  41 --  Note that we take advantage of the implementation permission to
  42 --  make this unit Pure instead of Preelaborable, see RM 13.7(36)
  43
  44    type Name is (SYSTEM_NAME_GNAT);
  45    System_Name : constant Name := SYSTEM_NAME_GNAT;
  46
  47    --  System-Dependent Named Numbers
  48
  49    Min_Int               : constant := Long_Long_Integer'First;
  50    Max_Int               : constant := Long_Long_Integer'Last;
  51
  52    Max_Binary_Modulus    : constant := 2 ** Long_Long_Integer'Size;
  53    Max_Nonbinary_Modulus : constant := Integer'Last;
  54
  55    Max_Base_Digits       : constant := Long_Long_Float'Digits;
  56    Max_Digits            : constant := Long_Long_Float'Digits;
  57
  58    Max_Mantissa          : constant := 63;
  59    Fine_Delta            : constant := 2.0 ** (-Max_Mantissa);
  60
  61    Tick                  : constant := 0.01;
  62
  63    --  Storage-related Declarations
  64
  65    type Address is private;
  66    Null_Address : constant Address;
  67
  68    Storage_Unit : constant := 8;
  69    Word_Size    : constant := 32;
  70    Memory_Size  : constant := 2 ** 32;
  71
  72    --  Address comparison
  73
  74    function "<"  (Left, Right : Address) return Boolean;
  75    function "<=" (Left, Right : Address) return Boolean;
  76    function ">"  (Left, Right : Address) return Boolean;
  77    function ">=" (Left, Right : Address) return Boolean;
  78    function "="  (Left, Right : Address) return Boolean;
  79
  80    pragma Import (Intrinsic, "<");
  81    pragma Import (Intrinsic, "<=");
  82    pragma Import (Intrinsic, ">");
  83    pragma Import (Intrinsic, ">=");
  84    pragma Import (Intrinsic, "=");
  85
  86    --  Other System-Dependent Declarations
  87
  88    type Bit_Order is (High_Order_First, Low_Order_First);
  89    Default_Bit_Order : constant Bit_Order := High_Order_First;
  90
  91    --  Priority-related Declarations (RM D.1)
  92
  93    --  The values defined here are derived from the following Darwin
  94    --  sources:
  95    --
  96    --  Libc/pthreads/pthread.c
  97    --    pthread_init calls host_info to retrieve the HOST_PRIORITY_INFO.
  98    --    This file includes "pthread_internals".
  99    --  Libc/pthreads/pthread_internals.h
 100    --    This file includes <mach/mach.h>.
 101    --  xnu/osfmk/mach/mach.h
 102    --    This file includes <mach/mach_types.h>.
 103    --  xnu/osfmk/mach/mach_types.h
 104    --    This file includes <mach/host_info.h>.
 105    --  xnu/osfmk/mach/host_info.h
 106    --    This file contains the definition of the host_info_t data structure
 107    --    and the function prototype for host_info.
 108    --  xnu/osfmk/kern/host.c
 109    --    This file defines the function host_info which sets the
 110    --    priority_info field of struct host_info_t. This file includes
 111    --    <kern/processor.h>.
 112    --  xnu/osfmk/kern/processor.h
 113    --    This file includes <kern/sched.h>.
 114    --  xnu/osfmk/kern/sched.h
 115    --    This file defines the values for each level of priority.
 116
 117    Max_Interrupt_Priority : constant Positive := 63;
 118    Max_Priority           : constant Positive := Max_Interrupt_Priority - 1;
 119
 120    subtype Any_Priority is Integer range 0 .. Max_Interrupt_Priority;
 121    subtype Priority is Any_Priority range 0 .. Max_Priority;
 122    subtype Interrupt_Priority is Any_Priority
 123      range Priority'Last + 1 .. Max_Interrupt_Priority;
 124
 125    Default_Priority : constant Priority :=
 126      (Priority'Last - Priority'First) / 2;
 127
 128 private
 129
 130    type Address is mod Memory_Size;
 131    Null_Address : constant Address := 0;
 132
 133    --------------------------------------
 134    -- System Implementation Parameters --
 135    --------------------------------------
 136
 137    --  These parameters provide information about the target that is used
 138    --  by the compiler. They are in the private part of System, where they
 139    --  can be accessed using the special circuitry in the Targparm unit
 140    --  whose source should be consulted for more detailed descriptions
 141    --  of the individual switch values.
 142
 143    AAMP                      : constant Boolean := False;
 144    Backend_Divide_Checks     : constant Boolean := False;
 145    Backend_Overflow_Checks   : constant Boolean := False;
 146    Command_Line_Args         : constant Boolean := True;
 147    Configurable_Run_Time     : constant Boolean := False;
 148    Denorm                    : constant Boolean := True;
 149    Duration_32_Bits          : constant Boolean := False;
 150    Exit_Status_Supported     : constant Boolean := True;
 151    Fractional_Fixed_Ops      : constant Boolean := False;
 152    Frontend_Layout           : constant Boolean := False;
 153    Functions_Return_By_DSP   : constant Boolean := False;
 154    Machine_Overflows         : constant Boolean := False;
 155    Machine_Rounds            : constant Boolean := True;
 156    OpenVMS                   : constant Boolean := False;
 157    Preallocated_Stacks       : constant Boolean := False;
 158    Signed_Zeros              : constant Boolean := True;
 159    Stack_Check_Default       : constant Boolean := False;
 160    Stack_Check_Probes        : constant Boolean := False;
 161    Support_64_Bit_Divides    : constant Boolean := True;
 162    Support_Aggregates        : constant Boolean := True;
 163    Support_Composite_Assign  : constant Boolean := True;
 164    Support_Composite_Compare : constant Boolean := True;
 165    Support_Long_Shifts       : constant Boolean := True;
 166    Suppress_Standard_Library : constant Boolean := False;
 167    Use_Ada_Main_Program_Name : constant Boolean := False;
 168    ZCX_By_Default            : constant Boolean := True;
 169    GCC_ZCX_Support           : constant Boolean := True;
 170    Front_End_ZCX_Support     : constant Boolean := False;
 171
 172    --  Obsolete entries, to be removed eventually (bootstrap issues!)
 173
 174    --  High_Integrity_Mode       : constant Boolean := False;
 175    --  Long_Shifts_Inlined       : constant Boolean := True;
 176
 177 end System;