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1 | ------------------------------------------------------------------------------ |
2 | -- -- | |
3 | -- GNAT RUN-TIME COMPONENTS -- | |
4 | -- -- | |
5 | -- S Y S T E M -- | |
6 | -- -- | |
7 | -- S p e c -- | |
fbf5a39b | 8 | -- (Compiler Version) -- |
9d19cb95 | 9 | -- -- |
fbf5a39b | 10 | -- Copyright (C) 1992-2003 Free Software Foundation, Inc. -- |
9d19cb95 RK |
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 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, 59 Temple Place - Suite 330, Boston, -- | |
25 | -- MA 02111-1307, USA. -- | |
26 | -- -- | |
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. -- | |
33 | -- -- | |
34 | -- GNAT was originally developed by the GNAT team at New York University. -- | |
71ff80dc | 35 | -- Extensive contributions were provided by Ada Core Technologies Inc. -- |
9d19cb95 RK |
36 | -- -- |
37 | ------------------------------------------------------------------------------ | |
38 | ||
07fc65c4 GB |
39 | -- This version of System is a generic version that is used in building |
40 | -- the compiler. Right now, we have a host/target problem if we try to | |
41 | -- use the "proper" System, and since the compiler itself does not care | |
42 | -- about most System parameters, this generic version works fine. | |
43 | ||
9d19cb95 RK |
44 | package System is |
45 | pragma Pure (System); | |
46 | -- Note that we take advantage of the implementation permission to | |
47 | -- make this unit Pure instead of Preelaborable, see RM 13.7(36) | |
48 | ||
49 | type Name is (SYSTEM_NAME_GNAT); | |
50 | System_Name : constant Name := SYSTEM_NAME_GNAT; | |
51 | ||
52 | -- System-Dependent Named Numbers | |
53 | ||
54 | Min_Int : constant := Long_Long_Integer'First; | |
55 | Max_Int : constant := Long_Long_Integer'Last; | |
56 | ||
57 | Max_Binary_Modulus : constant := 2 ** Long_Long_Integer'Size; | |
58 | Max_Nonbinary_Modulus : constant := Integer'Last; | |
59 | ||
60 | Max_Base_Digits : constant := Long_Long_Float'Digits; | |
61 | Max_Digits : constant := Long_Long_Float'Digits; | |
62 | ||
63 | Max_Mantissa : constant := 63; | |
64 | Fine_Delta : constant := 2.0 ** (-Max_Mantissa); | |
65 | ||
fbf5a39b | 66 | Tick : constant := 0.01; |
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67 | |
68 | -- Storage-related Declarations | |
69 | ||
70 | type Address is private; | |
71 | Null_Address : constant Address; | |
72 | ||
73 | Storage_Unit : constant := Standard'Storage_Unit; | |
74 | Word_Size : constant := Standard'Word_Size; | |
75 | Memory_Size : constant := 2 ** Standard'Address_Size; | |
76 | ||
77 | -- Address comparison | |
78 | ||
79 | function "<" (Left, Right : Address) return Boolean; | |
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 | ||
85 | pragma Import (Intrinsic, "<"); | |
86 | pragma Import (Intrinsic, "<="); | |
87 | pragma Import (Intrinsic, ">"); | |
88 | pragma Import (Intrinsic, ">="); | |
89 | pragma Import (Intrinsic, "="); | |
90 | ||
91 | -- Other System-Dependent Declarations | |
92 | ||
93 | type Bit_Order is (High_Order_First, Low_Order_First); | |
94 | Default_Bit_Order : constant Bit_Order := | |
95 | Bit_Order'Val (Standard'Default_Bit_Order); | |
96 | ||
97 | -- Priority-related Declarations (RM D.1) | |
98 | ||
07fc65c4 | 99 | Max_Priority : constant Positive := 30; |
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100 | Max_Interrupt_Priority : constant Positive := 31; |
101 | ||
07fc65c4 GB |
102 | subtype Any_Priority is Integer range 0 .. 31; |
103 | subtype Priority is Any_Priority range 0 .. 30; | |
104 | subtype Interrupt_Priority is Any_Priority range 31 .. 31; | |
9d19cb95 | 105 | |
07fc65c4 | 106 | Default_Priority : constant Priority := 15; |
9d19cb95 RK |
107 | |
108 | private | |
109 | ||
110 | type Address is mod Memory_Size; | |
111 | Null_Address : constant Address := 0; | |
112 | ||
113 | -------------------------------------- | |
114 | -- System Implementation Parameters -- | |
115 | -------------------------------------- | |
116 | ||
117 | -- These parameters provide information about the target that is used | |
118 | -- by the compiler. They are in the private part of System, where they | |
119 | -- can be accessed using the special circuitry in the Targparm unit | |
120 | -- whose source should be consulted for more detailed descriptions | |
121 | -- of the individual switch values. | |
122 | ||
123 | -- This version of system.ads is used only for building the compiler. | |
124 | -- We really ought to use the proper target system (i.e. the one that | |
125 | -- corresponds to the host for the compiler), but that causes as yet | |
126 | -- unsolved makefile problems. For the most part the setting of these | |
127 | -- parameters is not too critical for the compiler version (e.g. we | |
128 | -- do not use floating-point anyway in the compiler). | |
129 | ||
130 | AAMP : constant Boolean := False; | |
07fc65c4 GB |
131 | Backend_Divide_Checks : constant Boolean := False; |
132 | Backend_Overflow_Checks : constant Boolean := False; | |
9d19cb95 | 133 | Command_Line_Args : constant Boolean := True; |
fbf5a39b | 134 | Configurable_Run_Time : constant Boolean := False; |
9d19cb95 | 135 | Denorm : constant Boolean := True; |
fbf5a39b AC |
136 | Duration_32_Bits : constant Boolean := False; |
137 | Exit_Status_Supported : constant Boolean := True; | |
07fc65c4 | 138 | Fractional_Fixed_Ops : constant Boolean := False; |
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139 | Frontend_Layout : constant Boolean := False; |
140 | Functions_Return_By_DSP : constant Boolean := False; | |
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141 | Machine_Overflows : constant Boolean := False; |
142 | Machine_Rounds : constant Boolean := True; | |
143 | OpenVMS : constant Boolean := False; | |
144 | Signed_Zeros : constant Boolean := True; | |
145 | Stack_Check_Default : constant Boolean := False; | |
146 | Stack_Check_Probes : constant Boolean := False; | |
fbf5a39b AC |
147 | Support_64_Bit_Divides : constant Boolean := True; |
148 | Support_Aggregates : constant Boolean := True; | |
149 | Support_Composite_Assign : constant Boolean := True; | |
150 | Support_Composite_Compare : constant Boolean := True; | |
151 | Support_Long_Shifts : constant Boolean := True; | |
152 | Suppress_Standard_Library : constant Boolean := False; | |
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153 | Use_Ada_Main_Program_Name : constant Boolean := False; |
154 | ZCX_By_Default : constant Boolean := False; | |
155 | GCC_ZCX_Support : constant Boolean := False; | |
156 | Front_End_ZCX_Support : constant Boolean := False; | |
157 | ||
fbf5a39b AC |
158 | -- Obsolete entries, to be removed eventually (bootstrap issues!) |
159 | ||
160 | High_Integrity_Mode : constant Boolean := False; | |
161 | Long_Shifts_Inlined : constant Boolean := True; | |
162 | ||
9d19cb95 | 163 | end System; |