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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 -- (Darwin/x86_64 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 ------------------------------------------------------------------------------
37 package 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).
43 type Name is (SYSTEM_NAME_GNAT);
44 System_Name : constant Name := SYSTEM_NAME_GNAT;
46 -- System-Dependent Named Numbers
48 Min_Int : constant := Long_Long_Integer'First;
49 Max_Int : constant := Long_Long_Integer'Last;
51 Max_Binary_Modulus : constant := 2 ** Long_Long_Integer'Size;
52 Max_Nonbinary_Modulus : constant := 2 ** Integer'Size - 1;
54 Max_Base_Digits : constant := Long_Long_Float'Digits;
55 Max_Digits : constant := Long_Long_Float'Digits;
57 Max_Mantissa : constant := 63;
58 Fine_Delta : constant := 2.0 ** (-Max_Mantissa);
60 Tick : constant := 0.01;
62 -- Storage-related Declarations
64 type Address is private;
65 pragma Preelaborable_Initialization (Address);
66 Null_Address : constant Address;
68 Storage_Unit : constant := 8;
69 Word_Size : constant := 64;
70 Memory_Size : constant := 2 ** 64;
72 -- Address comparison
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;
80 pragma Import (Intrinsic, "<");
81 pragma Import (Intrinsic, "<=");
82 pragma Import (Intrinsic, ">");
83 pragma Import (Intrinsic, ">=");
84 pragma Import (Intrinsic, "=");
86 -- Other System-Dependent Declarations
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
92 -- Priority-related Declarations (RM D.1)
94 -- The values defined here are derived from the following Darwin
95 -- sources:
97 -- Libc/pthreads/pthread.c
98 -- pthread_init calls host_info to retrieve the HOST_PRIORITY_INFO.
99 -- This file includes "pthread_internals".
100 -- Libc/pthreads/pthread_internals.h
101 -- This file includes <mach/mach.h>.
102 -- xnu/osfmk/mach/mach.h
103 -- This file includes <mach/mach_types.h>.
104 -- xnu/osfmk/mach/mach_types.h
105 -- This file includes <mach/host_info.h>.
106 -- xnu/osfmk/mach/host_info.h
107 -- This file contains the definition of the host_info_t data structure
108 -- and the function prototype for host_info.
109 -- xnu/osfmk/kern/host.c
110 -- This file defines the function host_info which sets the
111 -- priority_info field of struct host_info_t. This file includes
112 -- <kern/processor.h>.
113 -- xnu/osfmk/kern/processor.h
114 -- This file includes <kern/sched.h>.
115 -- xnu/osfmk/kern/sched.h
116 -- This file defines the values for each level of priority.
118 Max_Interrupt_Priority : constant Positive := 63;
119 Max_Priority : constant Positive := Max_Interrupt_Priority - 1;
121 subtype Any_Priority is Integer range 0 .. Max_Interrupt_Priority;
122 subtype Priority is Any_Priority range 0 .. Max_Priority;
123 subtype Interrupt_Priority is Any_Priority
124 range Priority'Last + 1 .. Max_Interrupt_Priority;
126 Default_Priority : constant Priority :=
127 (Priority'Last - Priority'First) / 2;
129 private
131 type Address is mod Memory_Size;
132 Null_Address : constant Address := 0;
134 --------------------------------------
135 -- System Implementation Parameters --
136 --------------------------------------
138 -- These parameters provide information about the target that is used
139 -- by the compiler. They are in the private part of System, where they
140 -- can be accessed using the special circuitry in the Targparm unit
141 -- whose source should be consulted for more detailed descriptions
142 -- of the individual switch values.
144 Backend_Divide_Checks : constant Boolean := False;
145 Backend_Overflow_Checks : constant Boolean := True;
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 Machine_Overflows : constant Boolean := False;
154 Machine_Rounds : constant Boolean := True;
155 Preallocated_Stacks : constant Boolean := False;
156 Signed_Zeros : constant Boolean := True;
157 Stack_Check_Default : constant Boolean := False;
158 Stack_Check_Probes : constant Boolean := True;
159 Stack_Check_Limits : constant Boolean := False;
160 Support_Aggregates : constant Boolean := True;
161 Support_Atomic_Primitives : constant Boolean := True;
162 Support_Composite_Assign : constant Boolean := True;
163 Support_Composite_Compare : constant Boolean := True;
164 Support_Long_Shifts : constant Boolean := True;
165 Always_Compatible_Rep : constant Boolean := False;
166 Suppress_Standard_Library : constant Boolean := False;
167 Use_Ada_Main_Program_Name : constant Boolean := False;
168 ZCX_By_Default : constant Boolean := True;
170 end System;