1 ------------------------------------------------------------------------------
3 -- GNAT RUN-TIME COMPONENTS --
8 -- (DEC Unix Version) --
10 -- Copyright (C) 1992-2006, Free Software Foundation, Inc. --
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. --
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. --
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. --
34 -- GNAT was originally developed by the GNAT team at New York University. --
35 -- Extensive contributions were provided by Ada Core Technologies Inc. --
37 ------------------------------------------------------------------------------
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 := Integer'Last;
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 := 1.0 / 1024.0;
64 -- Storage-related Declarations
66 type Address
is private;
67 Null_Address
: constant Address
;
69 Storage_Unit
: constant := 8;
70 Word_Size
: constant := 64;
71 Memory_Size
: constant := 2 ** 64;
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 function "=" (Left
, Right
: Address
) return Boolean;
81 pragma Import
(Intrinsic
, "<");
82 pragma Import
(Intrinsic
, "<=");
83 pragma Import
(Intrinsic
, ">");
84 pragma Import
(Intrinsic
, ">=");
85 pragma Import
(Intrinsic
, "=");
87 -- Other System-Dependent Declarations
89 type Bit_Order
is (High_Order_First
, Low_Order_First
);
90 Default_Bit_Order
: constant Bit_Order
:= Low_Order_First
;
91 pragma Warnings
(Off
, Default_Bit_Order
); -- kill constant condition warning
93 -- Priority-related Declarations (RM D.1)
95 Max_Priority
: constant Positive := 60;
96 Max_Interrupt_Priority
: constant Positive := 63;
98 subtype Any_Priority
is Integer range 0 .. 63;
99 subtype Priority
is Any_Priority
range 0 .. 60;
100 subtype Interrupt_Priority
is Any_Priority
range 61 .. 63;
102 Default_Priority
: constant Priority
:= 30;
106 type Address
is mod Memory_Size
;
107 Null_Address
: constant Address
:= 0;
109 --------------------------------------
110 -- System Implementation Parameters --
111 --------------------------------------
113 -- These parameters provide information about the target that is used
114 -- by the compiler. They are in the private part of System, where they
115 -- can be accessed using the special circuitry in the Targparm unit
116 -- whose source should be consulted for more detailed descriptions
117 -- of the individual switch values.
119 AAMP
: constant Boolean := False;
120 Backend_Divide_Checks
: constant Boolean := False;
121 Backend_Overflow_Checks
: constant Boolean := False;
122 Command_Line_Args
: constant Boolean := True;
123 Compiler_System_Version
: constant Boolean := False;
124 Configurable_Run_Time
: constant Boolean := False;
125 Denorm
: constant Boolean := False;
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 Functions_Return_By_DSP
: constant Boolean := False;
131 Machine_Overflows
: constant Boolean := False;
132 Machine_Rounds
: constant Boolean := True;
133 OpenVMS
: constant Boolean := False;
134 Preallocated_Stacks
: constant Boolean := False;
135 Signed_Zeros
: constant Boolean := True;
136 Stack_Check_Default
: constant Boolean := True;
137 Stack_Check_Probes
: constant Boolean := True;
138 Support_64_Bit_Divides
: constant Boolean := True;
139 Support_Aggregates
: constant Boolean := True;
140 Support_Composite_Assign
: constant Boolean := True;
141 Support_Composite_Compare
: constant Boolean := True;
142 Support_Long_Shifts
: constant Boolean := True;
143 Suppress_Standard_Library
: constant Boolean := False;
144 Use_Ada_Main_Program_Name
: constant Boolean := False;
145 ZCX_By_Default
: constant Boolean := True;
146 GCC_ZCX_Support
: constant Boolean := True;
147 Front_End_ZCX_Support
: constant Boolean := False;
149 -- Obsolete entries, to be removed eventually (bootstrap issues!)
151 High_Integrity_Mode
: constant Boolean := False;
152 Long_Shifts_Inlined
: constant Boolean := True;
154 -- Note: Denorm is False because denormals are only handled properly
155 -- if the -mieee switch is set, and we do not require this usage.
157 ---------------------------
158 -- Underlying Priorities --
159 ---------------------------
161 -- Important note: this section of the file must come AFTER the
162 -- definition of the system implementation parameters to ensure
163 -- that the value of these parameters is available for analysis
164 -- of the declarations here (using Rtsfind at compile time).
166 -- The underlying priorities table provides a generalized mechanism
167 -- for mapping from Ada priorities to system priorities. In some
168 -- cases a 1-1 mapping is not the convenient or optimal choice.
170 -- For Dec Unix 4.0d, we use a default 1-to-1 mapping that provides
171 -- the full range of 64 priorities available from the operating system.
173 -- On DU prior to 4.0d, less than 64 priorities are available so there
174 -- are two possibilities:
176 -- Limit your range of priorities to the range provided by the
177 -- OS (e.g 16 .. 32 on 4.0b)
179 -- Replace the standard table as described below
181 -- To replace the default values of the Underlying_Priorities mapping,
182 -- copy this source file into your build directory, edit the file to
183 -- reflect your desired behavior, and recompile with the command:
185 -- $ gcc -c -O3 -gnatpgn system.ads
187 -- then recompile the run-time parts that depend on this package:
189 -- $ gnatmake -a -gnatn -O3 <your application>
191 -- then force rebuilding your application if you need different options:
193 -- $ gnatmake -f <your options> <your application>
195 type Priorities_Mapping
is array (Any_Priority
) of Integer;
196 pragma Suppress_Initialization
(Priorities_Mapping
);
197 -- Suppress initialization in case gnat.adc specifies Normalize_Scalars
199 Underlying_Priorities
: constant Priorities_Mapping
:=
201 (Priority
'First => 0,
203 1 => 1, 2 => 2, 3 => 3, 4 => 4, 5 => 5,
204 6 => 6, 7 => 7, 8 => 8, 9 => 9, 10 => 10,
205 11 => 11, 12 => 12, 13 => 13, 14 => 14, 15 => 15,
206 16 => 16, 17 => 17, 18 => 18, 19 => 19, 20 => 20,
207 21 => 21, 22 => 22, 23 => 23, 24 => 24, 25 => 25,
208 26 => 26, 27 => 27, 28 => 28, 29 => 29,
210 Default_Priority
=> 30,
212 31 => 31, 32 => 32, 33 => 33, 34 => 34, 35 => 35,
213 36 => 36, 37 => 37, 38 => 38, 39 => 39, 40 => 40,
214 41 => 41, 42 => 42, 43 => 43, 44 => 44, 45 => 45,
215 46 => 46, 47 => 47, 48 => 48, 49 => 49, 50 => 50,
216 51 => 51, 52 => 52, 53 => 53, 54 => 54, 55 => 55,
217 56 => 56, 57 => 57, 58 => 58, 59 => 59,
223 Interrupt_Priority
'Last => 63);