1 ------------------------------------------------------------------------------
3 -- GNAT RUN-TIME COMPONENTS --
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 := 0.01;
64 -- Storage-related Declarations
66 type Address
is private;
67 Null_Address
: constant Address
;
69 Storage_Unit
: constant := 8;
70 Word_Size
: constant := 32;
71 Memory_Size
: constant := 2 ** 32;
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
:= High_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 := 30;
96 Max_Interrupt_Priority
: constant Positive := 31;
98 subtype Any_Priority
is Integer range 0 .. 31;
99 subtype Priority
is Any_Priority
range 0 .. 30;
100 subtype Interrupt_Priority
is Any_Priority
range 31 .. 31;
102 Default_Priority
: constant Priority
:= 15;
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 := 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 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 := False;
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 := False;
154 --------------------------
155 -- Underlying Priorities --
156 ---------------------------
158 -- Important note: this section of the file must come AFTER the
159 -- definition of the system implementation parameters to ensure
160 -- that the value of these parameters is available for analysis
161 -- of the declarations here (using Rtsfind at compile time).
163 -- The underlying priorities table provides a generalized mechanism
164 -- for mapping from Ada priorities to system priorities. In some
165 -- cases a 1-1 mapping is not the convenient or optimal choice.
167 -- For HP/UX DCE Threads, we use the full range of 31 priorities
168 -- in the Ada model, but map them by compression onto the more limited
169 -- range of priorities available in HP/UX.
170 -- For POSIX Threads, this table is ignored.
172 -- To replace the default values of the Underlying_Priorities mapping,
173 -- copy this source file into your build directory, edit the file to
174 -- reflect your desired behavior, and recompile with the command:
176 -- $ gcc -c -O2 -gnatpgn system.ads
178 -- then recompile the run-time parts that depend on this package:
180 -- $ gnatmake -a -gnatn -O2 <your application>
182 -- then force rebuilding your application if you need different options:
184 -- $ gnatmake -f <your options> <your application>
186 type Priorities_Mapping
is array (Any_Priority
) of Integer;
187 pragma Suppress_Initialization
(Priorities_Mapping
);
188 -- Suppress initialization in case gnat.adc specifies Normalize_Scalars
190 Underlying_Priorities
: constant Priorities_Mapping
:=
192 (Priority
'First => 16,
209 Default_Priority
=> 24,
228 Interrupt_Priority
=> 31);