1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
5 -- S Y S T E M . R I D E N T --
9 -- Copyright (C) 1992-2011, 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 3, 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. --
18 -- As a special exception under Section 7 of GPL version 3, you are granted --
19 -- additional permissions described in the GCC Runtime Library Exception, --
20 -- version 3.1, as published by the Free Software Foundation. --
22 -- You should have received a copy of the GNU General Public License and --
23 -- a copy of the GCC Runtime Library Exception along with this program; --
24 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
25 -- <http://www.gnu.org/licenses/>. --
27 -- GNAT was originally developed by the GNAT team at New York University. --
28 -- Extensive contributions were provided by Ada Core Technologies Inc. --
30 ------------------------------------------------------------------------------
32 -- This package defines the set of restriction identifiers. It is a generic
33 -- package that is instantiated by the compiler/binder in package Rident, and
34 -- is instantiated in package System.Restrictions for use at run-time.
36 -- The reason that we make this a generic package is so that in the case of
37 -- the instantiation in Rident for use at compile time and bind time, we can
38 -- generate normal image tables for the enumeration types, which are needed
39 -- for diagnostic and informational messages. At run-time we really do not
40 -- want to waste the space for these image tables, and they are not needed,
41 -- 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_Allocators_After_Elaboration, -- Ada 2012 (RM D.7(19.1/2))
68 No_Anonymous_Allocators, -- Ada 2012 (RM H.4(8/1))
69 No_Asynchronous_Control, -- (RM D.7(10))
71 No_Default_Stream_Attributes, -- Ada 2012 (RM 13.12.1(4/2))
72 No_Delay, -- (RM H.4(21))
73 No_Direct_Boolean_Operators, -- GNAT
74 No_Dispatch, -- (RM H.4(19))
75 No_Dispatching_Calls, -- GNAT
76 No_Dynamic_Attachment, -- GNAT
77 No_Dynamic_Priorities, -- (RM D.9(9))
78 No_Enumeration_Maps, -- GNAT
79 No_Entry_Calls_In_Elaboration_Code, -- GNAT
80 No_Entry_Queue, -- GNAT (Ravenscar)
81 No_Exception_Handlers, -- GNAT
82 No_Exception_Propagation, -- GNAT
83 No_Exception_Registration, -- GNAT
84 No_Exceptions, -- (RM H.4(12))
85 No_Finalization, -- GNAT
86 No_Fixed_Point, -- (RM H.4(15))
87 No_Floating_Point, -- (RM H.4(14))
88 No_IO, -- (RM H.4(20))
89 No_Implicit_Conditionals, -- GNAT
90 No_Implicit_Dynamic_Code, -- GNAT
91 No_Implicit_Heap_Allocations, -- (RM D.8(8), H.4(3))
92 No_Implicit_Loops, -- GNAT
93 No_Initialize_Scalars, -- GNAT
94 No_Local_Allocators, -- (RM H.4(8))
95 No_Local_Timing_Events, -- (RM D.7(10.2/2))
96 No_Local_Protected_Objects, -- GNAT
97 No_Nested_Finalization, -- (RM D.7(4))
98 No_Protected_Type_Allocators, -- GNAT
99 No_Protected_Types, -- (RM H.4(5))
100 No_Recursion, -- (RM H.4(22))
101 No_Reentrancy, -- (RM H.4(23))
102 No_Relative_Delay, -- GNAT (Ravenscar)
103 No_Requeue_Statements, -- GNAT
104 No_Secondary_Stack, -- GNAT
105 No_Select_Statements, -- GNAT (Ravenscar)
106 No_Specific_Termination_Handlers, -- (RM D.7(10.7/2))
107 No_Standard_Storage_Pools, -- GNAT
108 No_Stream_Optimizations, -- GNAT
110 No_Task_Allocators, -- (RM D.7(7))
111 No_Task_Attributes_Package, -- GNAT
112 No_Task_Hierarchy, -- (RM D.7(3), H.4(3))
113 No_Task_Termination, -- GNAT (Ravenscar)
115 No_Terminate_Alternatives, -- (RM D.7(6))
116 No_Unchecked_Access, -- (RM H.4(18))
117 No_Unchecked_Conversion, -- (RM H.4(16))
118 No_Unchecked_Deallocation, -- (RM H.4(9))
119 Static_Priorities, -- GNAT
120 Static_Storage_Size, -- GNAT
122 -- The following require consistency checking with special rules. See
123 -- individual routines in unit Bcheck for details of what is required.
125 No_Default_Initialization, -- GNAT
127 -- The following cases do not require consistency checking
129 Immediate_Reclamation, -- (RM H.4(10))
130 No_Implementation_Aspect_Specifications, -- Ada 2012 AI-241
131 No_Implementation_Attributes, -- Ada 2005 AI-257
132 No_Implementation_Identifiers, -- Ada 2012 AI-246
133 No_Implementation_Pragmas, -- Ada 2005 AI-257
134 No_Implementation_Restrictions, -- GNAT
135 No_Implementation_Units, -- Ada 2012 AI-242
136 No_Implicit_Aliasing, -- GNAT
137 No_Elaboration_Code, -- GNAT
138 No_Obsolescent_Features, -- Ada 2005 AI-368
139 No_Wide_Characters, -- GNAT
142 -- The following cases require a parameter value
144 -- The following entries are fully checked at compile/bind time, which
145 -- means that the compiler can in general tell the minimum value which
146 -- could be used with a restrictions pragma. The binder can deduce the
147 -- appropriate minimum value for the partition by taking the maximum
148 -- value required by any unit.
150 Max_Protected_Entries, -- (RM D.7(14))
151 Max_Select_Alternatives, -- (RM D.7(12))
152 Max_Task_Entries, -- (RM D.7(13), H.4(3))
154 -- The following entries are also fully checked at compile/bind time,
155 -- and the compiler can also at least in some cases tell the minimum
156 -- value which could be used with a restriction pragma. The difference
157 -- is that the contributions are additive, so the binder deduces this
158 -- value by adding the unit contributions.
160 Max_Tasks, -- (RM D.7(19), H.4(3))
162 -- The following entries are checked at compile time only for zero/
163 -- nonzero entries. This means that the compiler can tell at compile
164 -- time if a restriction value of zero is (would be) violated, but that
165 -- the compiler cannot distinguish between different non-zero values.
167 Max_Asynchronous_Select_Nesting, -- (RM D.7(18), H.4(3))
168 Max_Entry_Queue_Length, -- GNAT
170 -- The remaining entries are not checked at compile/bind time
172 Max_Storage_At_Blocking, -- (RM D.7(17))
174 Not_A_Restriction_Id);
176 -- Synonyms permitted for historical purposes of compatibility.
177 -- Must be coordinated with Restrict.Process_Restriction_Synonym.
179 Boolean_Entry_Barriers : Restriction_Id renames Simple_Barriers;
180 Max_Entry_Queue_Depth : Restriction_Id renames Max_Entry_Queue_Length;
181 No_Dynamic_Interrupts : Restriction_Id renames No_Dynamic_Attachment;
182 No_Requeue : Restriction_Id renames No_Requeue_Statements;
183 No_Task_Attributes : Restriction_Id renames No_Task_Attributes_Package;
185 subtype All_Restrictions is Restriction_Id range
186 Simple_Barriers .. Max_Storage_At_Blocking;
187 -- All restrictions (excluding only Not_A_Restriction_Id)
189 subtype All_Boolean_Restrictions is Restriction_Id range
190 Simple_Barriers .. SPARK;
191 -- All restrictions which do not take a parameter
193 subtype Partition_Boolean_Restrictions is All_Boolean_Restrictions range
194 Simple_Barriers .. Static_Storage_Size;
195 -- Boolean restrictions that are checked for partition consistency.
196 -- Note that all parameter restrictions are checked for partition
197 -- consistency by default, so this distinction is only needed in the
198 -- case of Boolean restrictions.
200 subtype Cunit_Boolean_Restrictions is All_Boolean_Restrictions range
201 Immediate_Reclamation .. SPARK;
202 -- Boolean restrictions that are not checked for partition consistency
203 -- and that thus apply only to the current unit. Note that for these
204 -- restrictions, the compiler does not apply restrictions found in
205 -- with'ed units, parent specs etc. to the main unit.
207 subtype All_Parameter_Restrictions is
209 Max_Protected_Entries .. Max_Storage_At_Blocking;
210 -- All restrictions that take a parameter
212 subtype Checked_Parameter_Restrictions is
213 All_Parameter_Restrictions range
214 Max_Protected_Entries .. Max_Entry_Queue_Length;
215 -- These are the parameter restrictions that can be at least partially
216 -- checked at compile/binder time. Minimally, the compiler can detect
217 -- violations of a restriction pragma with a value of zero reliably.
219 subtype Checked_Max_Parameter_Restrictions is
220 Checked_Parameter_Restrictions range
221 Max_Protected_Entries .. Max_Task_Entries;
222 -- Restrictions with parameters that can be checked in some cases by
223 -- maximizing among statically detected instances where the compiler
224 -- can determine the count.
226 subtype Checked_Add_Parameter_Restrictions is
227 Checked_Parameter_Restrictions range
228 Max_Tasks .. Max_Tasks;
229 -- Restrictions with parameters that can be checked in some cases by
230 -- summing the statically detected instances where the compiler can
231 -- determine the count.
233 subtype Checked_Val_Parameter_Restrictions is
234 Checked_Parameter_Restrictions range
235 Max_Protected_Entries .. Max_Tasks;
236 -- Restrictions with parameter where the count is known at least in some
237 -- cases by the compiler/binder.
239 subtype Checked_Zero_Parameter_Restrictions is
240 Checked_Parameter_Restrictions range
241 Max_Asynchronous_Select_Nesting .. Max_Entry_Queue_Length;
242 -- Restrictions with parameters where the compiler can detect the use of
243 -- the feature, and hence violations of a restriction specifying a value
244 -- of zero, but cannot detect specific values other than zero/nonzero.
246 subtype Unchecked_Parameter_Restrictions is
247 All_Parameter_Restrictions range
248 Max_Storage_At_Blocking .. Max_Storage_At_Blocking;
249 -- Restrictions with parameters where the compiler cannot ever detect
250 -- corresponding compile time usage, so the binder and compiler never
251 -- detect violations of any restriction.
253 -------------------------------------
254 -- Restriction Status Declarations --
255 -------------------------------------
257 -- The following declarations are used to record the current status or
258 -- restrictions (for the current unit, or related units, at compile time,
259 -- and for all units in a partition at bind time or run time).
261 type Restriction_Flags is array (All_Restrictions) of Boolean;
262 type Restriction_Values is array (All_Parameter_Restrictions) of Natural;
263 type Parameter_Flags is array (All_Parameter_Restrictions) of Boolean;
265 type Restrictions_Info is record
266 Set : Restriction_Flags;
267 -- An entry is True in the Set array if a restrictions pragma has been
268 -- encountered for the given restriction. If the value is True for a
269 -- parameter restriction, then the corresponding entry in the Value
270 -- array gives the minimum value encountered for any such restriction.
272 Value : Restriction_Values;
273 -- If the entry for a parameter restriction in Set is True (i.e. a
274 -- restrictions pragma for the restriction has been encountered), then
275 -- the corresponding entry in the Value array is the minimum value
276 -- specified by any such restrictions pragma. Note that a restrictions
277 -- pragma specifying a value greater than Int'Last is simply ignored.
279 Violated : Restriction_Flags;
280 -- An entry is True in the violations array if the compiler has detected
281 -- a violation of the restriction. For a parameter restriction, the
282 -- Count and Unknown arrays have additional information.
284 Count : Restriction_Values;
285 -- If an entry for a parameter restriction is True in Violated, the
286 -- corresponding entry in the Count array may record additional
287 -- information. If the actual minimum count is known (by taking
288 -- maximums, or sums, depending on the restriction), it will be
289 -- recorded in this array. If not, then the value will remain zero.
290 -- The value is also zero for a non-violated restriction.
292 Unknown : Parameter_Flags;
293 -- If an entry for a parameter restriction is True in Violated, the
294 -- corresponding entry in the Unknown array may record additional
295 -- information. If the actual count is not known by the compiler (but
296 -- is known to be non-zero), then the entry in Unknown will be True.
297 -- This indicates that the value in Count is not known to be exact,
298 -- and the actual violation count may be higher.
300 -- Note: If Violated (K) is True, then either Count (K) > 0 or
301 -- Unknown (K) = True. It is possible for both these to be set.
302 -- For example, if Count (K) = 3 and Unknown (K) is True, it means
303 -- that the actual violation count is at least 3 but might be higher.
306 No_Restrictions : constant Restrictions_Info :=
307 (Set => (others => False),
308 Value => (others => 0),
309 Violated => (others => False),
310 Count => (others => 0),
311 Unknown => (others => False));
312 -- Used to initialize Restrictions_Info variables
314 ----------------------------------
315 -- Profile Definitions and Data --
316 ----------------------------------
318 -- Note: to add a profile, modify the following declarations appropriately,
319 -- add Name_xxx to Snames, and add a branch to the conditions for pragmas
320 -- Profile and Profile_Warnings in the body of Sem_Prag.
324 No_Implementation_Extensions,
327 -- Names of recognized profiles. No_Profile is used to indicate that a
328 -- restriction came from pragma Restrictions[_Warning], as opposed to
329 -- pragma Profile[_Warning].
331 subtype Profile_Name_Actual is Profile_Name
332 range No_Implementation_Extensions .. Restricted;
333 -- Actual used profile names
335 type Profile_Data is record
336 Set : Restriction_Flags;
337 -- Set to True if given restriction must be set for the profile, and
338 -- False if it need not be set (False does not mean that it must not be
339 -- set, just that it need not be set). If the flag is True for a
340 -- parameter restriction, then the Value array gives the maximum value
341 -- permitted by the profile.
343 Value : Restriction_Values;
344 -- An entry in this array is meaningful only if the corresponding flag
345 -- in Set is True. In that case, the value in this array is the maximum
346 -- value of the parameter permitted by the profile.
349 Profile_Info : constant array (Profile_Name_Actual) of Profile_Data :=
351 (No_Implementation_Extensions =>
352 -- Restrictions for Restricted profile
355 (No_Implementation_Aspect_Specifications => True,
356 No_Implementation_Attributes => True,
357 No_Implementation_Identifiers => True,
358 No_Implementation_Pragmas => True,
359 No_Implementation_Units => True,
362 -- Value settings for Restricted profile (none
367 -- Restricted Profile
371 -- Restrictions for Restricted profile
374 (No_Abort_Statements => True,
375 No_Asynchronous_Control => True,
376 No_Dynamic_Attachment => True,
377 No_Dynamic_Priorities => True,
378 No_Entry_Queue => True,
379 No_Local_Protected_Objects => True,
380 No_Protected_Type_Allocators => True,
381 No_Requeue_Statements => True,
382 No_Task_Allocators => True,
383 No_Task_Attributes_Package => True,
384 No_Task_Hierarchy => True,
385 No_Terminate_Alternatives => True,
386 Max_Asynchronous_Select_Nesting => True,
387 Max_Protected_Entries => True,
388 Max_Select_Alternatives => True,
389 Max_Task_Entries => True,
392 -- Value settings for Restricted profile
395 (Max_Asynchronous_Select_Nesting => 0,
396 Max_Protected_Entries => 1,
397 Max_Select_Alternatives => 0,
398 Max_Task_Entries => 0,
403 -- Note: the table entries here only represent the
404 -- required restriction profile for Ravenscar. The
405 -- full Ravenscar profile also requires:
407 -- pragma Dispatching_Policy (FIFO_Within_Priorities);
408 -- pragma Locking_Policy (Ceiling_Locking);
409 -- pragma Detect_Blocking
413 -- Restrictions for Ravenscar = Restricted profile ..
416 (No_Abort_Statements => True,
417 No_Asynchronous_Control => True,
418 No_Dynamic_Attachment => True,
419 No_Dynamic_Priorities => True,
420 No_Entry_Queue => True,
421 No_Local_Protected_Objects => True,
422 No_Protected_Type_Allocators => True,
423 No_Requeue_Statements => True,
424 No_Task_Allocators => True,
425 No_Task_Attributes_Package => True,
426 No_Task_Hierarchy => True,
427 No_Terminate_Alternatives => True,
428 Max_Asynchronous_Select_Nesting => True,
429 Max_Protected_Entries => True,
430 Max_Select_Alternatives => True,
431 Max_Task_Entries => True,
433 -- plus these additional restrictions:
436 No_Implicit_Heap_Allocations => True,
437 No_Relative_Delay => True,
438 No_Select_Statements => True,
439 No_Task_Termination => True,
440 Simple_Barriers => True,
443 -- Value settings for Ravenscar (same as Restricted)
446 (Max_Asynchronous_Select_Nesting => 0,
447 Max_Protected_Entries => 1,
448 Max_Select_Alternatives => 0,
449 Max_Task_Entries => 0,
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