1 ------------------------------------------------------------------------------
3 -- GNAT RUN-TIME COMPONENTS --
8 -- (OpenVMS 64bit GCC_ZCX DEC Threads Version) --
10 -- Copyright (C) 1992-2012, 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 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. --
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. --
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/>. --
32 -- GNAT was originally developed by the GNAT team at New York University. --
33 -- Extensive contributions were provided by Ada Core Technologies Inc. --
35 ------------------------------------------------------------------------------
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 new Long_Integer;
65 Null_Address
: constant Address
;
66 -- Although this is declared as an integer type, no arithmetic operations
67 -- are available (see abstract declarations below), and furthermore there
68 -- is special processing in the compiler that prevents the use of integer
69 -- literals with this type (use To_Address to convert integer literals).
71 -- Conversion to and from Short_Address is however freely permitted, and
72 -- is indeed the reason that Address is declared as an integer type.
74 Storage_Unit
: constant := 8;
75 Word_Size
: constant := 64;
76 Memory_Size
: constant := 2 ** 64;
80 function "<" (Left
, Right
: Address
) return Boolean;
81 function "<=" (Left
, Right
: Address
) return Boolean;
82 function ">" (Left
, Right
: Address
) return Boolean;
83 function ">=" (Left
, Right
: Address
) return Boolean;
84 function "=" (Left
, Right
: Address
) return Boolean;
86 pragma Import
(Intrinsic
, "<");
87 pragma Import
(Intrinsic
, "<=");
88 pragma Import
(Intrinsic
, ">");
89 pragma Import
(Intrinsic
, ">=");
90 pragma Import
(Intrinsic
, "=");
92 -- Abstract declarations for arithmetic operations on type address.
93 -- These declarations are needed when Address is non-private. They
94 -- avoid excessive visibility of arithmetic operations on address
95 -- which are typically available elsewhere (e.g. Storage_Elements)
96 -- and which would cause excessive ambiguities in application code.
98 function "+" (Left
, Right
: Address
) return Address
is abstract;
99 function "-" (Left
, Right
: Address
) return Address
is abstract;
100 function "/" (Left
, Right
: Address
) return Address
is abstract;
101 function "*" (Left
, Right
: Address
) return Address
is abstract;
102 function "mod" (Left
, Right
: Address
) return Address
is abstract;
104 -- Other System-Dependent Declarations
106 type Bit_Order
is (High_Order_First
, Low_Order_First
);
107 Default_Bit_Order
: constant Bit_Order
:= Low_Order_First
;
108 pragma Warnings
(Off
, Default_Bit_Order
); -- kill constant condition warning
110 -- Priority-related Declarations (RM D.1)
112 Max_Priority
: constant Positive := 30;
113 Max_Interrupt_Priority
: constant Positive := 31;
115 subtype Any_Priority
is Integer range 0 .. 31;
116 subtype Priority
is Any_Priority
range 0 .. 30;
117 subtype Interrupt_Priority
is Any_Priority
range 31 .. 31;
119 Default_Priority
: constant Priority
:= 15;
123 Null_Address
: constant Address
:= 0;
125 --------------------------------------
126 -- System Implementation Parameters --
127 --------------------------------------
129 -- These parameters provide information about the target that is used
130 -- by the compiler. They are in the private part of System, where they
131 -- can be accessed using the special circuitry in the Targparm unit
132 -- whose source should be consulted for more detailed descriptions
133 -- of the individual switch values.
135 Backend_Divide_Checks
: constant Boolean := False;
136 Backend_Overflow_Checks
: constant Boolean := True;
137 Command_Line_Args
: constant Boolean := True;
138 Configurable_Run_Time
: constant Boolean := False;
139 Denorm
: constant Boolean := False;
140 Duration_32_Bits
: constant Boolean := False;
141 Exit_Status_Supported
: constant Boolean := True;
142 Fractional_Fixed_Ops
: constant Boolean := False;
143 Frontend_Layout
: constant Boolean := False;
144 Machine_Overflows
: constant Boolean := False;
145 Machine_Rounds
: constant Boolean := True;
146 OpenVMS
: constant Boolean := True;
147 Preallocated_Stacks
: constant Boolean := False;
148 Signed_Zeros
: constant Boolean := True;
149 Stack_Check_Default
: constant Boolean := True;
150 Stack_Check_Probes
: constant Boolean := True;
151 Stack_Check_Limits
: constant Boolean := False;
152 Support_Aggregates
: constant Boolean := True;
153 Support_Atomic_Primitives
: constant Boolean := True;
154 Support_Composite_Assign
: constant Boolean := True;
155 Support_Composite_Compare
: constant Boolean := True;
156 Support_Long_Shifts
: constant Boolean := True;
157 Always_Compatible_Rep
: constant Boolean := True;
158 Suppress_Standard_Library
: constant Boolean := False;
159 Use_Ada_Main_Program_Name
: constant Boolean := False;
160 ZCX_By_Default
: constant Boolean := True;
162 --------------------------
163 -- Underlying Priorities --
164 ---------------------------
166 -- Important note: this section of the file must come AFTER the
167 -- definition of the system implementation parameters to ensure
168 -- that the value of these parameters is available for analysis
169 -- of the declarations here (using Rtsfind at compile time).
171 -- The underlying priorities table provides a generalized mechanism
172 -- for mapping from Ada priorities to system priorities. In some
173 -- cases a 1-1 mapping is not the convenient or optimal choice.
175 -- For DEC Threads OpenVMS, we use the full range of 31 priorities
176 -- in the Ada model, but map them by compression onto the more limited
177 -- range of priorities available in OpenVMS.
179 -- To replace the default values of the Underlying_Priorities mapping,
180 -- copy this source file into your build directory, edit the file to
181 -- reflect your desired behavior, and recompile with the command:
183 -- $ gcc -c -O3 -gnatpgn system.ads
185 -- then recompile the run-time parts that depend on this package:
187 -- $ gnatmake -a -gnatn -O3 <your application>
189 -- then force rebuilding your application if you need different options:
191 -- $ gnatmake -f <your options> <your application>
193 type Priorities_Mapping
is array (Any_Priority
) of Integer;
194 pragma Suppress_Initialization
(Priorities_Mapping
);
195 -- Suppress initialization in case gnat.adc specifies Normalize_Scalars
197 Underlying_Priorities
: constant Priorities_Mapping
:=
199 (Priority
'First => 16,
216 Default_Priority
=> 24,
235 Interrupt_Priority
=> 31);
237 ----------------------------
238 -- Special VMS Interfaces --
239 ----------------------------
241 procedure Lib_Stop
(Cond_Value
: Integer);
242 pragma Import
(C
, Lib_Stop
);
243 pragma Import_Procedure
(Lib_Stop
, "LIB$STOP", Mechanism
=> (Value
));
244 -- Interface to VMS condition handling. Used by RTSfind and pragma
245 -- {Import,Export}_Exception. Put here because this is the only
246 -- VMS specific package that doesn't drag in tasking.
248 ADA_GNAT
: constant Boolean := True;
249 pragma Export_Object
(ADA_GNAT
, "ADA$GNAT");
250 -- Ubiquitous global symbol identifying a GNAT compiled image to VMS Debug.
253 pragma Ident
("GNAT"); -- Gnat_Static_Version_String
254 -- Default ident for all VMS images.