File : system-darwin-x86.ads
1 ------------------------------------------------------------------------------
2 -- --
3 -- GNAT RUN-TIME COMPONENTS --
4 -- --
5 -- S Y S T E M --
6 -- --
7 -- S p e c --
8 -- (Darwin/x86 Version) --
9 -- --
10 -- Copyright (C) 1992-2015, 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 -- --
24 -- --
25 -- --
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
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).
42
43 pragma No_Elaboration_Code_All;
44 -- Allow the use of that restriction in units that WITH this unit
45
46 type Name is (SYSTEM_NAME_GNAT);
47 System_Name : constant Name := SYSTEM_NAME_GNAT;
48
49 -- System-Dependent Named Numbers
50
51 Min_Int : constant := Long_Long_Integer'First;
52 Max_Int : constant := Long_Long_Integer'Last;
53
54 Max_Binary_Modulus : constant := 2 ** Long_Long_Integer'Size;
55 Max_Nonbinary_Modulus : constant := 2 ** Integer'Size - 1;
56
57 Max_Base_Digits : constant := Long_Long_Float'Digits;
58 Max_Digits : constant := Long_Long_Float'Digits;
59
60 Max_Mantissa : constant := 63;
61 Fine_Delta : constant := 2.0 ** (-Max_Mantissa);
62
63 Tick : constant := 0.01;
64
65 -- Storage-related Declarations
66
67 type Address is private;
68 pragma Preelaborable_Initialization (Address);
69 Null_Address : constant Address;
70
71 Storage_Unit : constant := 8;
72 Word_Size : constant := 32;
73 Memory_Size : constant := 2 ** 32;
74
75 -- Address comparison
76
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 function "=" (Left, Right : Address) return Boolean;
82
83 pragma Import (Intrinsic, "<");
84 pragma Import (Intrinsic, "<=");
85 pragma Import (Intrinsic, ">");
86 pragma Import (Intrinsic, ">=");
87 pragma Import (Intrinsic, "=");
88
89 -- Other System-Dependent Declarations
90
91 type Bit_Order is (High_Order_First, Low_Order_First);
92 Default_Bit_Order : constant Bit_Order := Low_Order_First;
93 pragma Warnings (Off, Default_Bit_Order); -- kill constant condition warning
94
95 -- Priority-related Declarations (RM D.1)
96
97 -- The values defined here are derived from the following Darwin
98 -- sources:
99 --
100 -- Libc/pthreads/pthread.c
101 -- pthread_init calls host_info to retrieve the HOST_PRIORITY_INFO.
102 -- This file includes "pthread_internals".
103 -- Libc/pthreads/pthread_internals.h
104 -- This file includes <mach/mach.h>.
105 -- xnu/osfmk/mach/mach.h
106 -- This file includes <mach/mach_types.h>.
107 -- xnu/osfmk/mach/mach_types.h
108 -- This file includes <mach/host_info.h>.
109 -- xnu/osfmk/mach/host_info.h
110 -- This file contains the definition of the host_info_t data structure
111 -- and the function prototype for host_info.
112 -- xnu/osfmk/kern/host.c
113 -- This file defines the function host_info which sets the
114 -- priority_info field of struct host_info_t. This file includes
115 -- <kern/processor.h>.
116 -- xnu/osfmk/kern/processor.h
117 -- This file includes <kern/sched.h>.
118 -- xnu/osfmk/kern/sched.h
119 -- This file defines the values for each level of priority.
120
121 Max_Interrupt_Priority : constant Positive := 63;
122 Max_Priority : constant Positive := Max_Interrupt_Priority - 1;
123
124 subtype Any_Priority is Integer range 0 .. Max_Interrupt_Priority;
125 subtype Priority is Any_Priority range 0 .. Max_Priority;
126 subtype Interrupt_Priority is Any_Priority
127 range Priority'Last + 1 .. Max_Interrupt_Priority;
128
129 Default_Priority : constant Priority :=
130 (Priority'Last - Priority'First) / 2;
131
132 private
133
134 type Address is mod Memory_Size;
135 Null_Address : constant Address := 0;
136
137 --------------------------------------
138 -- System Implementation Parameters --
139 --------------------------------------
140
141 -- These parameters provide information about the target that is used
142 -- by the compiler. They are in the private part of System, where they
143 -- can be accessed using the special circuitry in the Targparm unit
144 -- whose source should be consulted for more detailed descriptions
145 -- of the individual switch values.
146
147 Backend_Divide_Checks : constant Boolean := False;
148 Backend_Overflow_Checks : constant Boolean := True;
149 Command_Line_Args : constant Boolean := True;
150 Configurable_Run_Time : constant Boolean := False;
151 Denorm : constant Boolean := True;
152 Duration_32_Bits : constant Boolean := False;
153 Exit_Status_Supported : constant Boolean := True;
154 Fractional_Fixed_Ops : constant Boolean := False;
155 Frontend_Layout : constant Boolean := False;
156 Machine_Overflows : constant Boolean := False;
157 Machine_Rounds : constant Boolean := True;
158 Preallocated_Stacks : constant Boolean := False;
159 Signed_Zeros : constant Boolean := True;
160 Stack_Check_Default : constant Boolean := False;
161 Stack_Check_Probes : constant Boolean := True;
162 Stack_Check_Limits : constant Boolean := False;
163 Support_Aggregates : constant Boolean := True;
164 Support_Atomic_Primitives : constant Boolean := True;
165 Support_Composite_Assign : constant Boolean := True;
166 Support_Composite_Compare : constant Boolean := True;
167 Support_Long_Shifts : constant Boolean := True;
168 Always_Compatible_Rep : constant Boolean := False;
169 Suppress_Standard_Library : constant Boolean := False;
170 Use_Ada_Main_Program_Name : constant Boolean := False;
171 Frontend_Exceptions : constant Boolean := False;
172 ZCX_By_Default : constant Boolean := True;
173
174 end System;