PR target/16201
[official-gcc.git] / gcc / ada / system-darwin-ppc.ads
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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 --
8 -- (Darwin/PPC Version) --
9 -- --
10 -- Copyright (C) 1992-2004 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 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. --
35 -- Extensive contributions were provided by Ada Core Technologies Inc. --
36 -- --
37 ------------------------------------------------------------------------------
39 package System is
40 pragma Pure (System);
41 -- Note that we take advantage of the implementation permission to
42 -- make this unit Pure instead of Preelaborable, see RM 13.7(36)
44 type Name is (SYSTEM_NAME_GNAT);
45 System_Name : constant Name := SYSTEM_NAME_GNAT;
47 -- System-Dependent Named Numbers
49 Min_Int : constant := Long_Long_Integer'First;
50 Max_Int : constant := Long_Long_Integer'Last;
52 Max_Binary_Modulus : constant := 2 ** Long_Long_Integer'Size;
53 Max_Nonbinary_Modulus : constant := Integer'Last;
55 Max_Base_Digits : constant := Long_Long_Float'Digits;
56 Max_Digits : constant := Long_Long_Float'Digits;
58 Max_Mantissa : constant := 63;
59 Fine_Delta : constant := 2.0 ** (-Max_Mantissa);
61 Tick : constant := 0.01;
63 -- Storage-related Declarations
65 type Address is private;
66 Null_Address : constant Address;
68 Storage_Unit : constant := 8;
69 Word_Size : constant := 32;
70 Memory_Size : constant := 2 ** 32;
72 -- Address comparison
74 function "<" (Left, Right : Address) return Boolean;
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;
80 pragma Import (Intrinsic, "<");
81 pragma Import (Intrinsic, "<=");
82 pragma Import (Intrinsic, ">");
83 pragma Import (Intrinsic, ">=");
84 pragma Import (Intrinsic, "=");
86 -- Other System-Dependent Declarations
88 type Bit_Order is (High_Order_First, Low_Order_First);
89 Default_Bit_Order : constant Bit_Order := High_Order_First;
91 -- Priority-related Declarations (RM D.1)
93 -- The values defined here are derived from the following Darwin
94 -- sources:
96 -- Libc/pthreads/pthread.c
97 -- pthread_init calls host_info to retrieve the HOST_PRIORITY_INFO.
98 -- This file includes "pthread_internals".
99 -- Libc/pthreads/pthread_internals.h
100 -- This file includes <mach/mach.h>.
101 -- xnu/osfmk/mach/mach.h
102 -- This file includes <mach/mach_types.h>.
103 -- xnu/osfmk/mach/mach_types.h
104 -- This file includes <mach/host_info.h>.
105 -- xnu/osfmk/mach/host_info.h
106 -- This file contains the definition of the host_info_t data structure
107 -- and the function prototype for host_info.
108 -- xnu/osfmk/kern/host.c
109 -- This file defines the function host_info which sets the
110 -- priority_info field of struct host_info_t. This file includes
111 -- <kern/processor.h>.
112 -- xnu/osfmk/kern/processor.h
113 -- This file includes <kern/sched.h>.
114 -- xnu/osfmk/kern/sched.h
115 -- This file defines the values for each level of priority.
117 Max_Interrupt_Priority : constant Positive := 63;
118 Max_Priority : constant Positive := Max_Interrupt_Priority - 1;
120 subtype Any_Priority is Integer range 0 .. Max_Interrupt_Priority;
121 subtype Priority is Any_Priority range 0 .. Max_Priority;
122 subtype Interrupt_Priority is Any_Priority
123 range Priority'Last + 1 .. Max_Interrupt_Priority;
125 Default_Priority : constant Priority :=
126 (Priority'Last - Priority'First) / 2;
128 private
130 type Address is mod Memory_Size;
131 Null_Address : constant Address := 0;
133 --------------------------------------
134 -- System Implementation Parameters --
135 --------------------------------------
137 -- These parameters provide information about the target that is used
138 -- by the compiler. They are in the private part of System, where they
139 -- can be accessed using the special circuitry in the Targparm unit
140 -- whose source should be consulted for more detailed descriptions
141 -- of the individual switch values.
143 AAMP : constant Boolean := False;
144 Backend_Divide_Checks : constant Boolean := False;
145 Backend_Overflow_Checks : constant Boolean := False;
146 Command_Line_Args : constant Boolean := True;
147 Configurable_Run_Time : constant Boolean := False;
148 Denorm : constant Boolean := True;
149 Duration_32_Bits : constant Boolean := False;
150 Exit_Status_Supported : constant Boolean := True;
151 Fractional_Fixed_Ops : constant Boolean := False;
152 Frontend_Layout : constant Boolean := False;
153 Functions_Return_By_DSP : constant Boolean := False;
154 Machine_Overflows : constant Boolean := False;
155 Machine_Rounds : constant Boolean := True;
156 OpenVMS : constant Boolean := False;
157 Preallocated_Stacks : constant Boolean := False;
158 Signed_Zeros : constant Boolean := True;
159 Stack_Check_Default : constant Boolean := False;
160 Stack_Check_Probes : constant Boolean := False;
161 Support_64_Bit_Divides : constant Boolean := True;
162 Support_Aggregates : constant Boolean := True;
163 Support_Composite_Assign : constant Boolean := True;
164 Support_Composite_Compare : constant Boolean := True;
165 Support_Long_Shifts : constant Boolean := True;
166 Suppress_Standard_Library : constant Boolean := False;
167 Use_Ada_Main_Program_Name : constant Boolean := False;
168 ZCX_By_Default : constant Boolean := True;
169 GCC_ZCX_Support : constant Boolean := True;
170 Front_End_ZCX_Support : constant Boolean := False;
172 -- Obsolete entries, to be removed eventually (bootstrap issues!)
174 -- High_Integrity_Mode : constant Boolean := False;
175 -- Long_Shifts_Inlined : constant Boolean := True;
177 end System;