1------------------------------------------------------------------------------
2--                                                                          --
3--                        GNAT RUN-TIME COMPONENTS                          --
4--                                                                          --
5--                               S Y S T E M                                --
6--                                                                          --
7--                                 S p e c                                  --
8--                        (GNU-Linux/ia64 Version)                          --
9--                                                                          --
10--          Copyright (C) 1992-2012, 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 3,  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.                                     --
22--                                                                          --
23-- As a special exception under Section 7 of GPL version 3, you are granted --
24-- additional permissions described in the GCC Runtime Library Exception,   --
25-- version 3.1, as published by the Free Software Foundation.               --
26--                                                                          --
27-- You should have received a copy of the GNU General Public License and    --
28-- a copy of the GCC Runtime Library Exception along with this program;     --
29-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
30-- <http://www.gnu.org/licenses/>.                                          --
31--                                                                          --
32-- GNAT was originally developed  by the GNAT team at  New York University. --
33-- Extensive contributions were provided by Ada Core Technologies Inc.      --
34--                                                                          --
35------------------------------------------------------------------------------
36
37package System is
38   pragma Pure;
39   --  Note that we take advantage of the implementation permission to make
40   --  this unit Pure instead of Preelaborable; see RM 13.7.1(15). In Ada
41   --  2005, this is Pure in any case (AI-362).
42
43   type Name is (SYSTEM_NAME_GNAT);
44   System_Name : constant Name := SYSTEM_NAME_GNAT;
45
46   --  System-Dependent Named Numbers
47
48   Min_Int               : constant := Long_Long_Integer'First;
49   Max_Int               : constant := Long_Long_Integer'Last;
50
51   Max_Binary_Modulus    : constant := 2 ** Long_Long_Integer'Size;
52   Max_Nonbinary_Modulus : constant := 2 ** Integer'Size - 1;
53
54   Max_Base_Digits       : constant := Long_Long_Float'Digits;
55   Max_Digits            : constant := Long_Long_Float'Digits;
56
57   Max_Mantissa          : constant := 63;
58   Fine_Delta            : constant := 2.0 ** (-Max_Mantissa);
59
60   Tick                  : constant := 0.01;
61
62   --  Storage-related Declarations
63
64   type Address is private;
65   pragma Preelaborable_Initialization (Address);
66   Null_Address : constant Address;
67
68   Storage_Unit : constant := 8;
69   Word_Size    : constant := 64;
70   Memory_Size  : constant := 2 ** 64;
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 := Low_Order_First;
90   pragma Warnings (Off, Default_Bit_Order); -- kill constant condition warning
91
92   --  Priority-related Declarations (RM D.1)
93
94   --  0 .. 98 corresponds to the system priority range 1 .. 99.
95   --
96   --  If the scheduling policy is SCHED_FIFO or SCHED_RR the runtime makes use
97   --  of the entire range provided by the system.
98   --
99   --  If the scheduling policy is SCHED_OTHER the only valid system priority
100   --  is 1 and other values are simply ignored.
101
102   Max_Priority           : constant Positive := 97;
103   Max_Interrupt_Priority : constant Positive := 98;
104
105   subtype Any_Priority       is Integer      range  0 .. 98;
106   subtype Priority           is Any_Priority range  0 .. 97;
107   subtype Interrupt_Priority is Any_Priority range 98 .. 98;
108
109   Default_Priority : constant Priority := 48;
110
111private
112
113   type Address is mod Memory_Size;
114   Null_Address : constant Address := 0;
115
116   --------------------------------------
117   -- System Implementation Parameters --
118   --------------------------------------
119
120   --  These parameters provide information about the target that is used
121   --  by the compiler. They are in the private part of System, where they
122   --  can be accessed using the special circuitry in the Targparm unit
123   --  whose source should be consulted for more detailed descriptions
124   --  of the individual switch values.
125
126   Backend_Divide_Checks     : constant Boolean := False;
127   Backend_Overflow_Checks   : constant Boolean := True;
128   Command_Line_Args         : constant Boolean := True;
129   Configurable_Run_Time     : constant Boolean := False;
130   Denorm                    : constant Boolean := True;
131   Duration_32_Bits          : constant Boolean := False;
132   Exit_Status_Supported     : constant Boolean := True;
133   Fractional_Fixed_Ops      : constant Boolean := False;
134   Frontend_Layout           : constant Boolean := False;
135   Machine_Overflows         : constant Boolean := False;
136   Machine_Rounds            : constant Boolean := True;
137   Preallocated_Stacks       : constant Boolean := False;
138   Signed_Zeros              : constant Boolean := True;
139   Stack_Check_Default       : constant Boolean := False;
140   Stack_Check_Probes        : constant Boolean := True;
141   Stack_Check_Limits        : constant Boolean := False;
142   Support_Aggregates        : constant Boolean := True;
143   Support_Atomic_Primitives : constant Boolean := True;
144   Support_Composite_Assign  : constant Boolean := True;
145   Support_Composite_Compare : constant Boolean := True;
146   Support_Long_Shifts       : constant Boolean := True;
147   Always_Compatible_Rep     : constant Boolean := True;
148   Suppress_Standard_Library : constant Boolean := False;
149   Use_Ada_Main_Program_Name : constant Boolean := False;
150   ZCX_By_Default            : constant Boolean := True;
151
152end System;
153