1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
5 -- S Y S T E M . R I D E N T --
9 -- Copyright (C) 1992-2008, Free Software Foundation, Inc. --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 2, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING. If not, write --
19 -- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
20 -- Boston, MA 02110-1301, USA. --
22 -- As a special exception, if other files instantiate generics from this --
23 -- unit, or you link this unit with other files to produce an executable, --
24 -- this unit does not by itself cause the resulting executable to be --
25 -- covered by the GNU General Public License. This exception does not --
26 -- however invalidate any other reasons why the executable file might be --
27 -- covered by the GNU Public License. --
29 -- GNAT was originally developed by the GNAT team at New York University. --
30 -- Extensive contributions were provided by Ada Core Technologies Inc. --
32 ------------------------------------------------------------------------------
34 -- This package defines the set of restriction identifiers. It is a generic
35 -- package that is instantiated by the compiler/binder in package Rident, and
36 -- is instantiated in package System.Restrictions for use at run-time.
38 -- The reason that we make this a generic package is so that in the case of
39 -- the instantiation in Rident for use at compile time and bind time, we can
40 -- generate normal image tables for the enumeration types, which are needed
41 -- for diagnostic and informational messages. At run-time we really do not
42 -- want to waste the space for these image tables, and they are not needed,
43 -- so we can do the instantiation under control of Discard_Names to remove
47 package System.Rident is
50 -- The following enumeration type defines the set of restriction
51 -- identifiers that are implemented in GNAT.
53 -- To add a new restriction identifier, add an entry with the name to be
54 -- used in the pragma, and add calls to the Restrict.Check_Restriction
55 -- routine as appropriate.
57 type Restriction_Id is
59 -- The following cases are checked for consistency in the binder. The
60 -- binder will check that every unit either has the restriction set, or
61 -- does not violate the restriction.
63 (Simple_Barriers, -- GNAT (Ravenscar)
64 No_Abort_Statements, -- (RM D.7(5), H.4(3))
65 No_Access_Subprograms, -- (RM H.4(17))
66 No_Allocators, -- (RM H.4(7))
67 No_Asynchronous_Control, -- (RM D.7(10))
69 No_Delay, -- (RM H.4(21))
70 No_Direct_Boolean_Operators, -- GNAT
71 No_Dispatch, -- (RM H.4(19))
72 No_Dispatching_Calls, -- GNAT
73 No_Dynamic_Attachment, -- GNAT
74 No_Dynamic_Priorities, -- (RM D.9(9))
75 No_Enumeration_Maps, -- GNAT
76 No_Entry_Calls_In_Elaboration_Code, -- GNAT
77 No_Entry_Queue, -- GNAT (Ravenscar)
78 No_Exception_Handlers, -- GNAT
79 No_Exception_Propagation, -- GNAT
80 No_Exception_Registration, -- GNAT
81 No_Exceptions, -- (RM H.4(12))
82 No_Finalization, -- GNAT
83 No_Fixed_Point, -- (RM H.4(15))
84 No_Floating_Point, -- (RM H.4(14))
85 No_IO, -- (RM H.4(20))
86 No_Implicit_Conditionals, -- GNAT
87 No_Implicit_Dynamic_Code, -- GNAT
88 No_Implicit_Heap_Allocations, -- (RM D.8(8), H.4(3))
89 No_Implicit_Loops, -- GNAT
90 No_Initialize_Scalars, -- GNAT
91 No_Local_Allocators, -- (RM H.4(8))
92 No_Local_Timing_Events, -- (RM D.7(10.2/2))
93 No_Local_Protected_Objects, -- GNAT
94 No_Nested_Finalization, -- (RM D.7(4))
95 No_Protected_Type_Allocators, -- GNAT
96 No_Protected_Types, -- (RM H.4(5))
97 No_Recursion, -- (RM H.4(22))
98 No_Reentrancy, -- (RM H.4(23))
99 No_Relative_Delay, -- GNAT (Ravenscar)
100 No_Requeue_Statements, -- GNAT
101 No_Secondary_Stack, -- GNAT
102 No_Select_Statements, -- GNAT (Ravenscar)
103 No_Specific_Termination_Handlers, -- (RM D.7(10.7/2))
104 No_Standard_Storage_Pools, -- GNAT
105 No_Stream_Optimizations, -- GNAT
107 No_Task_Allocators, -- (RM D.7(7))
108 No_Task_Attributes_Package, -- GNAT
109 No_Task_Hierarchy, -- (RM D.7(3), H.4(3))
110 No_Task_Termination, -- GNAT (Ravenscar)
112 No_Terminate_Alternatives, -- (RM D.7(6))
113 No_Unchecked_Access, -- (RM H.4(18))
114 No_Unchecked_Conversion, -- (RM H.4(16))
115 No_Unchecked_Deallocation, -- (RM H.4(9))
116 Static_Priorities, -- GNAT
117 Static_Storage_Size, -- GNAT
119 -- The following require consistency checking with special rules. See
120 -- individual routines in unit Bcheck for details of what is required.
122 No_Default_Initialization, -- GNAT
124 -- The following cases do not require consistency checking
126 Immediate_Reclamation, -- (RM H.4(10))
127 No_Implementation_Attributes, -- Ada 2005 AI-257
128 No_Implementation_Pragmas, -- Ada 2005 AI-257
129 No_Implementation_Restrictions, -- GNAT
130 No_Elaboration_Code, -- GNAT
131 No_Obsolescent_Features, -- Ada 2005 AI-368
132 No_Wide_Characters, -- GNAT
134 -- The following cases require a parameter value
136 -- The following entries are fully checked at compile/bind time, which
137 -- means that the compiler can in general tell the minimum value which
138 -- could be used with a restrictions pragma. The binder can deduce the
139 -- appropriate minimum value for the partition by taking the maximum
140 -- value required by any unit.
142 Max_Protected_Entries, -- (RM D.7(14))
143 Max_Select_Alternatives, -- (RM D.7(12))
144 Max_Task_Entries, -- (RM D.7(13), H.4(3))
146 -- The following entries are also fully checked at compile/bind time,
147 -- and the compiler can also at least in some cases tell the minimum
148 -- value which could be used with a restriction pragma. The difference
149 -- is that the contributions are additive, so the binder deduces this
150 -- value by adding the unit contributions.
152 Max_Tasks, -- (RM D.7(19), H.4(3))
154 -- The following entries are checked at compile time only for zero/
155 -- nonzero entries. This means that the compiler can tell at compile
156 -- time if a restriction value of zero is (would be) violated, but that
157 -- the compiler cannot distinguish between different non-zero values.
159 Max_Asynchronous_Select_Nesting, -- (RM D.7(18), H.4(3))
160 Max_Entry_Queue_Length, -- GNAT
162 -- The remaining entries are not checked at compile/bind time
164 Max_Storage_At_Blocking, -- (RM D.7(17))
166 Not_A_Restriction_Id);
168 -- Synonyms permitted for historical purposes of compatibility.
169 -- Must be coordinated with Restrict.Process_Restriction_Synonym.
171 Boolean_Entry_Barriers : Restriction_Id renames Simple_Barriers;
172 Max_Entry_Queue_Depth : Restriction_Id renames Max_Entry_Queue_Length;
173 No_Dynamic_Interrupts : Restriction_Id renames No_Dynamic_Attachment;
174 No_Requeue : Restriction_Id renames No_Requeue_Statements;
175 No_Task_Attributes : Restriction_Id renames No_Task_Attributes_Package;
177 subtype All_Restrictions is Restriction_Id range
178 Simple_Barriers .. Max_Storage_At_Blocking;
179 -- All restrictions (excluding only Not_A_Restriction_Id)
181 subtype All_Boolean_Restrictions is Restriction_Id range
182 Simple_Barriers .. No_Wide_Characters;
183 -- All restrictions which do not take a parameter
185 subtype Partition_Boolean_Restrictions is All_Boolean_Restrictions range
186 Simple_Barriers .. Static_Storage_Size;
187 -- Boolean restrictions that are checked for partition consistency.
188 -- Note that all parameter restrictions are checked for partition
189 -- consistency by default, so this distinction is only needed in the
190 -- case of Boolean restrictions.
192 subtype Cunit_Boolean_Restrictions is All_Boolean_Restrictions range
193 Immediate_Reclamation .. No_Wide_Characters;
194 -- Boolean restrictions that are not checked for partition consistency
195 -- and that thus apply only to the current unit. Note that for these
196 -- restrictions, the compiler does not apply restrictions found in
197 -- with'ed units, parent specs etc. to the main unit.
199 subtype All_Parameter_Restrictions is
201 Max_Protected_Entries .. Max_Storage_At_Blocking;
202 -- All restrictions that take a parameter
204 subtype Checked_Parameter_Restrictions is
205 All_Parameter_Restrictions range
206 Max_Protected_Entries .. Max_Entry_Queue_Length;
207 -- These are the parameter restrictions that can be at least partially
208 -- checked at compile/binder time. Minimally, the compiler can detect
209 -- violations of a restriction pragma with a value of zero reliably.
211 subtype Checked_Max_Parameter_Restrictions is
212 Checked_Parameter_Restrictions range
213 Max_Protected_Entries .. Max_Task_Entries;
214 -- Restrictions with parameters that can be checked in some cases by
215 -- maximizing among statically detected instances where the compiler
216 -- can determine the count.
218 subtype Checked_Add_Parameter_Restrictions is
219 Checked_Parameter_Restrictions range
220 Max_Tasks .. Max_Tasks;
221 -- Restrictions with parameters that can be checked in some cases by
222 -- summing the statically detected instances where the compiler can
223 -- determine the count.
225 subtype Checked_Val_Parameter_Restrictions is
226 Checked_Parameter_Restrictions range
227 Max_Protected_Entries .. Max_Tasks;
228 -- Restrictions with parameter where the count is known at least in some
229 -- cases by the compiler/binder.
231 subtype Checked_Zero_Parameter_Restrictions is
232 Checked_Parameter_Restrictions range
233 Max_Asynchronous_Select_Nesting .. Max_Entry_Queue_Length;
234 -- Restrictions with parameters where the compiler can detect the use of
235 -- the feature, and hence violations of a restriction specifying a value
236 -- of zero, but cannot detect specific values other than zero/nonzero.
238 subtype Unchecked_Parameter_Restrictions is
239 All_Parameter_Restrictions range
240 Max_Storage_At_Blocking .. Max_Storage_At_Blocking;
241 -- Restrictions with parameters where the compiler cannot ever detect
242 -- corresponding compile time usage, so the binder and compiler never
243 -- detect violations of any restriction.
245 -------------------------------------
246 -- Restriction Status Declarations --
247 -------------------------------------
249 -- The following declarations are used to record the current status or
250 -- restrictions (for the current unit, or related units, at compile time,
251 -- and for all units in a partition at bind time or run time).
253 type Restriction_Flags is array (All_Restrictions) of Boolean;
254 type Restriction_Values is array (All_Parameter_Restrictions) of Natural;
255 type Parameter_Flags is array (All_Parameter_Restrictions) of Boolean;
257 type Restrictions_Info is record
258 Set : Restriction_Flags;
259 -- An entry is True in the Set array if a restrictions pragma has been
260 -- encountered for the given restriction. If the value is True for a
261 -- parameter restriction, then the corresponding entry in the Value
262 -- array gives the minimum value encountered for any such restriction.
264 Value : Restriction_Values;
265 -- If the entry for a parameter restriction in Set is True (i.e. a
266 -- restrictions pragma for the restriction has been encountered), then
267 -- the corresponding entry in the Value array is the minimum value
268 -- specified by any such restrictions pragma. Note that a restrictions
269 -- pragma specifying a value greater than Int'Last is simply ignored.
271 Violated : Restriction_Flags;
272 -- An entry is True in the violations array if the compiler has detected
273 -- a violation of the restriction. For a parameter restriction, the
274 -- Count and Unknown arrays have additional information.
276 Count : Restriction_Values;
277 -- If an entry for a parameter restriction is True in Violated, the
278 -- corresponding entry in the Count array may record additional
279 -- information. If the actual minimum count is known (by taking
280 -- maximums, or sums, depending on the restriction), it will be
281 -- recorded in this array. If not, then the value will remain zero.
282 -- The value is also zero for a non-violated restriction.
284 Unknown : Parameter_Flags;
285 -- If an entry for a parameter restriction is True in Violated, the
286 -- corresponding entry in the Unknown array may record additional
287 -- information. If the actual count is not known by the compiler (but
288 -- is known to be non-zero), then the entry in Unknown will be True.
289 -- This indicates that the value in Count is not known to be exact,
290 -- and the actual violation count may be higher.
292 -- Note: If Violated (K) is True, then either Count (K) > 0 or
293 -- Unknown (K) = True. It is possible for both these to be set.
294 -- For example, if Count (K) = 3 and Unknown (K) is True, it means
295 -- that the actual violation count is at least 3 but might be higher.
298 No_Restrictions : constant Restrictions_Info :=
299 (Set => (others => False),
300 Value => (others => 0),
301 Violated => (others => False),
302 Count => (others => 0),
303 Unknown => (others => False));
304 -- Used to initialize Restrictions_Info variables
306 ----------------------------------
307 -- Profile Definitions and Data --
308 ----------------------------------
310 type Profile_Name is (No_Profile, Ravenscar, Restricted);
311 -- Names of recognized profiles. No_Profile is used to indicate that a
312 -- restriction came from pragma Restrictions[_Warning], as opposed to
313 -- pragma Profile[_Warning].
315 subtype Profile_Name_Actual is Profile_Name range Ravenscar .. Restricted;
316 -- Actual used profile names
318 type Profile_Data is record
319 Set : Restriction_Flags;
320 -- Set to True if given restriction must be set for the profile, and
321 -- False if it need not be set (False does not mean that it must not be
322 -- set, just that it need not be set). If the flag is True for a
323 -- parameter restriction, then the Value array gives the maximum value
324 -- permitted by the profile.
326 Value : Restriction_Values;
327 -- An entry in this array is meaningful only if the corresponding flag
328 -- in Set is True. In that case, the value in this array is the maximum
329 -- value of the parameter permitted by the profile.
332 Profile_Info : array (Profile_Name_Actual) of Profile_Data :=
334 -- Restricted Profile
338 -- Restrictions for Restricted profile
341 (No_Abort_Statements => True,
342 No_Asynchronous_Control => True,
343 No_Dynamic_Attachment => True,
344 No_Dynamic_Priorities => True,
345 No_Entry_Queue => True,
346 No_Local_Protected_Objects => True,
347 No_Protected_Type_Allocators => True,
348 No_Requeue_Statements => True,
349 No_Task_Allocators => True,
350 No_Task_Attributes_Package => True,
351 No_Task_Hierarchy => True,
352 No_Terminate_Alternatives => True,
353 Max_Asynchronous_Select_Nesting => True,
354 Max_Protected_Entries => True,
355 Max_Select_Alternatives => True,
356 Max_Task_Entries => True,
359 -- Value settings for Restricted profile
362 (Max_Asynchronous_Select_Nesting => 0,
363 Max_Protected_Entries => 1,
364 Max_Select_Alternatives => 0,
365 Max_Task_Entries => 0,
370 -- Note: the table entries here only represent the
371 -- required restriction profile for Ravenscar. The
372 -- full Ravenscar profile also requires:
374 -- pragma Dispatching_Policy (FIFO_Within_Priorities);
375 -- pragma Locking_Policy (Ceiling_Locking);
376 -- pragma Detect_Blocking
380 -- Restrictions for Ravenscar = Restricted profile ..
383 (No_Abort_Statements => True,
384 No_Asynchronous_Control => True,
385 No_Dynamic_Attachment => True,
386 No_Dynamic_Priorities => True,
387 No_Entry_Queue => True,
388 No_Local_Protected_Objects => True,
389 No_Protected_Type_Allocators => True,
390 No_Requeue_Statements => True,
391 No_Task_Allocators => True,
392 No_Task_Attributes_Package => True,
393 No_Task_Hierarchy => True,
394 No_Terminate_Alternatives => True,
395 Max_Asynchronous_Select_Nesting => True,
396 Max_Protected_Entries => True,
397 Max_Select_Alternatives => True,
398 Max_Task_Entries => True,
400 -- plus these additional restrictions:
403 No_Implicit_Heap_Allocations => True,
404 No_Relative_Delay => True,
405 No_Select_Statements => True,
406 No_Task_Termination => True,
407 Simple_Barriers => True,
410 -- Value settings for Ravenscar (same as Restricted)
413 (Max_Asynchronous_Select_Nesting => 0,
414 Max_Protected_Entries => 1,
415 Max_Select_Alternatives => 0,
416 Max_Task_Entries => 0,
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