File : system-hpux.ads
1 ------------------------------------------------------------------------------
2 -- --
3 -- GNAT RUN-TIME COMPONENTS --
4 -- --
5 -- S Y S T E M --
6 -- --
7 -- S p e c --
8 -- (HP-UX 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 := High_Order_First;
93 pragma Warnings (Off, Default_Bit_Order); -- kill constant condition warning
94
95 -- Priority-related Declarations (RM D.1)
96
97 Max_Priority : constant Positive := 30;
98 Max_Interrupt_Priority : constant Positive := 31;
99
100 subtype Any_Priority is Integer range 0 .. 31;
101 subtype Priority is Any_Priority range 0 .. 30;
102 subtype Interrupt_Priority is Any_Priority range 31 .. 31;
103
104 Default_Priority : constant Priority := 15;
105
106 private
107
108 type Address is mod Memory_Size;
109 Null_Address : constant Address := 0;
110
111 --------------------------------------
112 -- System Implementation Parameters --
113 --------------------------------------
114
115 -- These parameters provide information about the target that is used
116 -- by the compiler. They are in the private part of System, where they
117 -- can be accessed using the special circuitry in the Targparm unit
118 -- whose source should be consulted for more detailed descriptions
119 -- of the individual switch values.
120
121 Backend_Divide_Checks : constant Boolean := False;
122 Backend_Overflow_Checks : constant Boolean := True;
123 Command_Line_Args : constant Boolean := True;
124 Configurable_Run_Time : constant Boolean := False;
125 Denorm : constant Boolean := True;
126 Duration_32_Bits : constant Boolean := False;
127 Exit_Status_Supported : constant Boolean := True;
128 Fractional_Fixed_Ops : constant Boolean := False;
129 Frontend_Layout : constant Boolean := False;
130 Machine_Overflows : constant Boolean := False;
131 Machine_Rounds : constant Boolean := True;
132 Preallocated_Stacks : constant Boolean := False;
133 Signed_Zeros : constant Boolean := True;
134 Stack_Check_Default : constant Boolean := False;
135 Stack_Check_Probes : constant Boolean := True;
136 Stack_Check_Limits : constant Boolean := False;
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 := True;
142 Suppress_Standard_Library : constant Boolean := False;
143 Use_Ada_Main_Program_Name : constant Boolean := False;
144 Frontend_Exceptions : constant Boolean := False;
145 ZCX_By_Default : constant Boolean := True;
146
147 --------------------------
148 -- Underlying Priorities --
149 ---------------------------
150
151 -- Important note: this section of the file must come AFTER the
152 -- definition of the system implementation parameters to ensure
153 -- that the value of these parameters is available for analysis
154 -- of the declarations here (using Rtsfind at compile time).
155
156 -- The underlying priorities table provides a generalized mechanism
157 -- for mapping from Ada priorities to system priorities. In some
158 -- cases a 1-1 mapping is not the convenient or optimal choice.
159
160 -- For HP/UX DCE Threads, we use the full range of 31 priorities
161 -- in the Ada model, but map them by compression onto the more limited
162 -- range of priorities available in HP/UX.
163 -- For POSIX Threads, this table is ignored.
164
165 -- To replace the default values of the Underlying_Priorities mapping,
166 -- copy this source file into your build directory, edit the file to
167 -- reflect your desired behavior, and recompile with the command:
168
169 -- $ gcc -c -O2 -gnatpgn system.ads
170
171 -- then recompile the run-time parts that depend on this package:
172
173 -- $ gnatmake -a -gnatn -O2 <your application>
174
175 -- then force rebuilding your application if you need different options:
176
177 -- $ gnatmake -f <your options> <your application>
178
179 type Priorities_Mapping is array (Any_Priority) of Integer;
180 pragma Suppress_Initialization (Priorities_Mapping);
181 -- Suppress initialization in case gnat.adc specifies Normalize_Scalars
182
183 Underlying_Priorities : constant Priorities_Mapping :=
184
185 (Priority'First => 16,
186
187 1 => 17,
188 2 => 18,
189 3 => 18,
190 4 => 18,
191 5 => 18,
192 6 => 19,
193 7 => 19,
194 8 => 19,
195 9 => 20,
196 10 => 20,
197 11 => 21,
198 12 => 21,
199 13 => 22,
200 14 => 23,
201
202 Default_Priority => 24,
203
204 16 => 25,
205 17 => 25,
206 18 => 25,
207 19 => 26,
208 20 => 26,
209 21 => 26,
210 22 => 27,
211 23 => 27,
212 24 => 27,
213 25 => 28,
214 26 => 28,
215 27 => 29,
216 28 => 29,
217 29 => 30,
218
219 Priority'Last => 30,
220
221 Interrupt_Priority => 31);
222
223 end System;