Update concepts branch to revision 131834
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1 ------------------------------------------------------------------------------
2 -- --
3 -- GNAT RUN-TIME COMPONENTS --
4 -- --
5 -- S Y S T E M --
6 -- --
7 -- S p e c --
8 -- (FreeBSD/x86 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 ------------------------------------------------------------------------------
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).
45 type Name is (SYSTEM_NAME_GNAT);
46 System_Name : constant Name := SYSTEM_NAME_GNAT;
48 -- System-Dependent Named Numbers
50 Min_Int : constant := Long_Long_Integer'First;
51 Max_Int : constant := Long_Long_Integer'Last;
53 Max_Binary_Modulus : constant := 2 ** Long_Long_Integer'Size;
54 Max_Nonbinary_Modulus : constant := 2 ** Integer'Size - 1;
56 Max_Base_Digits : constant := Long_Long_Float'Digits;
57 Max_Digits : constant := Long_Long_Float'Digits;
59 Max_Mantissa : constant := 63;
60 Fine_Delta : constant := 2.0 ** (-Max_Mantissa);
62 Tick : constant := 0.000_001;
64 -- Storage-related Declarations
66 type Address is private;
67 pragma Preelaborable_Initialization (Address);
68 Null_Address : constant Address;
70 Storage_Unit : constant := 8;
71 Word_Size : constant := 32;
72 Memory_Size : constant := 2 ** 32;
74 -- Address comparison
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;
82 pragma Import (Intrinsic, "<");
83 pragma Import (Intrinsic, "<=");
84 pragma Import (Intrinsic, ">");
85 pragma Import (Intrinsic, ">=");
86 pragma Import (Intrinsic, "=");
88 -- Other System-Dependent Declarations
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
94 -- Priority-related Declarations (RM D.1)
96 Max_Priority : constant Positive := 30;
97 Max_Interrupt_Priority : constant Positive := 31;
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;
103 Default_Priority : constant Priority := 15;
105 private
107 type Address is mod Memory_Size;
108 Null_Address : constant Address := 0;
110 --------------------------------------
111 -- System Implementation Parameters --
112 --------------------------------------
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.
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 := True;
145 GCC_ZCX_Support : constant Boolean := True;
147 end System;