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19235870 RK |
1 | ------------------------------------------------------------------------------ |
2 | -- -- | |
3 | -- GNAT COMPILER COMPONENTS -- | |
4 | -- -- | |
5 | -- R E S T R I C T -- | |
6 | -- -- | |
7 | -- S p e c -- | |
8 | -- -- | |
8d0d46f4 | 9 | -- Copyright (C) 1992-2021, Free Software Foundation, Inc. -- |
19235870 RK |
10 | -- -- |
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- -- | |
b5c84c3c | 13 | -- ware Foundation; either version 3, or (at your option) any later ver- -- |
19235870 RK |
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 -- | |
b5c84c3c RD |
18 | -- Public License distributed with GNAT; see file COPYING3. If not, go to -- |
19 | -- http://www.gnu.org/licenses for a complete copy of the license. -- | |
19235870 RK |
20 | -- -- |
21 | -- GNAT was originally developed by the GNAT team at New York University. -- | |
71ff80dc | 22 | -- Extensive contributions were provided by Ada Core Technologies Inc. -- |
19235870 RK |
23 | -- -- |
24 | ------------------------------------------------------------------------------ | |
25 | ||
26 | -- This package deals with the implementation of the Restrictions pragma | |
27 | ||
596b25f9 AC |
28 | with Aspects; use Aspects; |
29 | with Namet; use Namet; | |
30 | with Rident; use Rident; | |
31 | with Snames; use Snames; | |
5f3ab6fb | 32 | with Table; |
596b25f9 AC |
33 | with Types; use Types; |
34 | with Uintp; use Uintp; | |
19235870 RK |
35 | |
36 | package Restrict is | |
37 | ||
de397a3d | 38 | Restrictions : Restrictions_Info := No_Restrictions; |
6e937c1c AC |
39 | -- This variable records restrictions found in any units in the main |
40 | -- extended unit, and in the case of restrictions checked for partition | |
41 | -- consistency, restrictions found in any with'ed units, parent specs | |
276e95ca | 42 | -- etc., since we may as well check as much as we can at compile time. |
6e937c1c | 43 | -- These variables should not be referenced directly by clients. Instead |
646e2823 | 44 | -- use Check_Restriction to record a violation of a restriction, and |
6e937c1c AC |
45 | -- Restriction_Active to test if a given restriction is active. |
46 | ||
47 | Restrictions_Loc : array (All_Restrictions) of Source_Ptr := | |
fbf5a39b | 48 | (others => No_Location); |
19235870 | 49 | -- Locations of Restrictions pragmas for error message purposes. |
fbf5a39b AC |
50 | -- Valid only if corresponding entry in Restrictions is set. A value |
51 | -- of No_Location is used for implicit restrictions set by another | |
52 | -- pragma, and a value of System_Location is used for restrictions | |
53 | -- set from package Standard by the processing in Targparm. | |
19235870 | 54 | |
9b7c38af | 55 | Restriction_Profile_Name : array (All_Restrictions) of Profile_Name; |
db761fee AC |
56 | -- Entries in this array are valid only if the corresponding restriction in |
57 | -- Restrictions is set. The value is the corresponding profile name if the | |
9b7c38af RD |
58 | -- restriction was set by a Profile or Profile_Warnings pragma. The value |
59 | -- is No_Profile in all other cases. | |
60 | ||
de397a3d | 61 | Main_Restrictions : Restrictions_Info := No_Restrictions; |
6e937c1c AC |
62 | -- This variable records only restrictions found in any units of the |
63 | -- main extended unit. These are the variables used for ali file output, | |
64 | -- since we want the binder to be able to accurately diagnose inter-unit | |
65 | -- restriction violations. | |
19235870 | 66 | |
f1c80977 | 67 | Restriction_Warnings : Rident.Restriction_Flags := (others => False); |
fbf5a39b AC |
68 | -- If one of these flags is set, then it means that violation of the |
69 | -- corresponding restriction results only in a warning message, not | |
70 | -- in an error message, and the restriction is not otherwise enforced. | |
6e937c1c AC |
71 | -- Note that the flags in Restrictions are set to indicate that the |
72 | -- restriction is set in this case, but Main_Restrictions is never | |
73 | -- set if Restriction_Warnings is set, so this does not look like a | |
74 | -- restriction to the binder. | |
fbf5a39b | 75 | |
6e937c1c | 76 | -- The following declarations establish a mapping between restriction |
ee10c0ec | 77 | -- identifiers, and the names of corresponding restricted library units. |
19235870 RK |
78 | |
79 | type Unit_Entry is record | |
80 | Res_Id : Restriction_Id; | |
81 | Filenm : String (1 .. 8); | |
82 | end record; | |
83 | ||
6e937c1c | 84 | Unit_Array : constant array (Positive range <>) of Unit_Entry := ( |
06effe87 AC |
85 | (No_Asynchronous_Control, "a-astaco"), |
86 | (No_Calendar, "a-calend"), | |
87 | (No_Calendar, "calendar"), | |
88 | (No_Delay, "a-calend"), | |
89 | (No_Delay, "calendar"), | |
90 | (No_Dynamic_Priorities, "a-dynpri"), | |
91 | (No_Finalization, "a-finali"), | |
79d09a49 | 92 | (No_IO, "a-direct"), |
06effe87 AC |
93 | (No_IO, "a-direio"), |
94 | (No_IO, "directio"), | |
95 | (No_IO, "a-sequio"), | |
96 | (No_IO, "sequenio"), | |
97 | (No_IO, "a-ststio"), | |
98 | (No_IO, "a-textio"), | |
99 | (No_IO, "text_io "), | |
100 | (No_IO, "a-witeio"), | |
101 | (No_Task_Attributes_Package, "a-tasatt"), | |
06effe87 AC |
102 | (No_Unchecked_Conversion, "a-unccon"), |
103 | (No_Unchecked_Conversion, "unchconv"), | |
104 | (No_Unchecked_Deallocation, "a-uncdea"), | |
105 | (No_Unchecked_Deallocation, "unchdeal")); | |
19235870 | 106 | |
bbf1aec2 RD |
107 | -- The following map has True for all GNAT-defined Restrictions. It is used |
108 | -- to implement pragma Restrictions (No_Implementation_Restrictions) (which | |
109 | -- is why this restriction itself is excluded from the list). | |
07fc65c4 | 110 | |
aff557c7 | 111 | Implementation_Restriction : constant array (All_Restrictions) of Boolean := |
9f4fd324 | 112 | (Simple_Barriers => True, |
07fc65c4 | 113 | No_Calendar => True, |
be4c5193 AC |
114 | No_Default_Initialization => True, |
115 | No_Direct_Boolean_Operators => True, | |
3bcd6930 | 116 | No_Dispatching_Calls => True, |
bcb8c3bb | 117 | No_Dynamic_Accessibility_Checks => True, |
9f4fd324 | 118 | No_Dynamic_Attachment => True, |
5b2217f8 | 119 | No_Elaboration_Code => True, |
07fc65c4 GB |
120 | No_Enumeration_Maps => True, |
121 | No_Entry_Calls_In_Elaboration_Code => True, | |
122 | No_Entry_Queue => True, | |
123 | No_Exception_Handlers => True, | |
be4c5193 | 124 | No_Exception_Propagation => True, |
fbf5a39b | 125 | No_Exception_Registration => True, |
be4c5193 | 126 | No_Finalization => True, |
0688dac8 | 127 | No_Fixed_IO => True, |
5b2217f8 RD |
128 | No_Implementation_Attributes => True, |
129 | No_Implementation_Pragmas => True, | |
07fc65c4 | 130 | No_Implicit_Conditionals => True, |
be4c5193 | 131 | No_Implicit_Aliasing => True, |
07fc65c4 GB |
132 | No_Implicit_Dynamic_Code => True, |
133 | No_Implicit_Loops => True, | |
be4c5193 | 134 | No_Initialize_Scalars => True, |
07fc65c4 | 135 | No_Local_Protected_Objects => True, |
bb012790 | 136 | No_Long_Long_Integers => True, |
d8941160 | 137 | No_Multiple_Elaboration => True, |
07fc65c4 GB |
138 | No_Protected_Type_Allocators => True, |
139 | No_Relative_Delay => True, | |
6e937c1c | 140 | No_Requeue_Statements => True, |
07fc65c4 GB |
141 | No_Secondary_Stack => True, |
142 | No_Select_Statements => True, | |
143 | No_Standard_Storage_Pools => True, | |
be4c5193 | 144 | No_Stream_Optimizations => True, |
07fc65c4 | 145 | No_Streams => True, |
06effe87 | 146 | No_Task_Attributes_Package => True, |
07fc65c4 | 147 | No_Task_Termination => True, |
be4c5193 | 148 | No_Tasking => True, |
07fc65c4 GB |
149 | No_Wide_Characters => True, |
150 | Static_Priorities => True, | |
151 | Static_Storage_Size => True, | |
b8c9f7af | 152 | Pure_Barriers => True, |
aa0dfa7e | 153 | SPARK_05 => True, |
07fc65c4 GB |
154 | others => False); |
155 | ||
db761fee AC |
156 | -------------------------- |
157 | -- No_Dependences Table -- | |
158 | -------------------------- | |
159 | ||
5f3ab6fb AC |
160 | -- The following table records entries made by Restrictions pragmas |
161 | -- that specify a parameter for No_Dependence. Each such pragma makes | |
162 | -- an entry in this table. | |
163 | ||
164 | -- Note: we have chosen to implement this restriction in the "syntactic" | |
165 | -- form, where we do not check that the named package is a language defined | |
166 | -- package, but instead we allow arbitrary package names. The discussion of | |
167 | -- this issue is not complete in the ARG, but the sense seems to be leaning | |
168 | -- in this direction, which makes more sense to us, since it is much more | |
169 | -- useful, and much easier to implement. | |
170 | ||
171 | type ND_Entry is record | |
172 | Unit : Node_Id; | |
173 | -- The unit parameter from the No_Dependence pragma | |
174 | ||
175 | Warn : Boolean; | |
176 | -- True if from Restriction_Warnings, False if from Restrictions | |
9b7c38af RD |
177 | |
178 | Profile : Profile_Name; | |
179 | -- Set to name of profile from which No_Dependence entry came, or to | |
180 | -- No_Profile if a pragma Restriction set the No_Dependence entry. | |
5f3ab6fb AC |
181 | end record; |
182 | ||
e7fceebc | 183 | package No_Dependences is new Table.Table ( |
5f3ab6fb AC |
184 | Table_Component_Type => ND_Entry, |
185 | Table_Index_Type => Int, | |
186 | Table_Low_Bound => 0, | |
187 | Table_Initial => 200, | |
188 | Table_Increment => 200, | |
e7fceebc | 189 | Table_Name => "Name_No_Dependences"); |
5f3ab6fb | 190 | |
db761fee AC |
191 | ---------------------------- |
192 | -- No_Use_Of_Entity Table -- | |
193 | ---------------------------- | |
194 | ||
195 | -- The following table records entries made by Restrictions pragmas | |
196 | -- that specify a parameter for No_Use_Of_Entity. Each such pragma makes | |
197 | -- an entry in this table. | |
198 | ||
199 | -- Note: we have chosen to implement this restriction in the "syntactic" | |
200 | -- form, where we allow arbitrary fully qualified names to be specified. | |
201 | ||
202 | type NE_Entry is record | |
203 | Entity : Node_Id; | |
204 | -- The entity parameter from the No_Use_Of_Entity pragma. This is in | |
205 | -- the form of a selected component, since that is the way the parser | |
206 | -- processes it, and we don't further analyze it. | |
207 | ||
208 | Warn : Boolean; | |
209 | -- True if from Restriction_Warnings, False if from Restrictions | |
210 | ||
211 | Profile : Profile_Name; | |
212 | -- Set to name of profile from which No_Use_Of_Entity entry came, or to | |
213 | -- No_Profile if a pragma Restriction set the No_Use_Of_Entity entry. | |
214 | end record; | |
215 | ||
216 | package No_Use_Of_Entity is new Table.Table ( | |
217 | Table_Component_Type => NE_Entry, | |
218 | Table_Index_Type => Int, | |
219 | Table_Low_Bound => 0, | |
220 | Table_Initial => 200, | |
221 | Table_Increment => 200, | |
222 | Table_Name => "Name_No_Use_Of_Entity"); | |
223 | ||
224 | -- Note that in addition to making an entry in this table, we also set the | |
225 | -- Boolean2 flag of the Name_Table entry for the simple name of the entity. | |
226 | -- This is used to avoid most useless searches of this table. | |
227 | ||
19235870 RK |
228 | ----------------- |
229 | -- Subprograms -- | |
230 | ----------------- | |
231 | ||
9aff36e9 RD |
232 | -- Note: several of these subprograms can generate error messages (e.g. |
233 | -- Check_Restriction). These routines should be called in the analyzer | |
234 | -- rather than the expander, so that the associated error messages are | |
235 | -- correctly generated in semantics only (-gnatc) mode. | |
236 | ||
fbf5a39b AC |
237 | function Abort_Allowed return Boolean; |
238 | pragma Inline (Abort_Allowed); | |
239 | -- Tests to see if abort is allowed by the current restrictions settings. | |
240 | -- For abort to be allowed, either No_Abort_Statements must be False, | |
241 | -- or Max_Asynchronous_Select_Nesting must be non-zero. | |
242 | ||
c86cf714 RD |
243 | procedure Check_Compiler_Unit (Feature : String; N : Node_Id); |
244 | -- If unit N is in a unit that has a pragma Compiler_Unit_Warning, then | |
245 | -- a message is posted on node N noting use of the given feature is not | |
246 | -- permitted in the compiler (bootstrap considerations). | |
247 | ||
248 | procedure Check_Compiler_Unit (Feature : String; Loc : Source_Ptr); | |
249 | -- If unit N is in a unit that has a pragma Compiler_Unit_Warning, then a | |
250 | -- message is posted at location Loc noting use of the given feature is not | |
251 | -- permitted in the compiler (bootstrap considerations). | |
2d9ea47f | 252 | |
19235870 RK |
253 | procedure Check_Restricted_Unit (U : Unit_Name_Type; N : Node_Id); |
254 | -- Checks if loading of unit U is prohibited by the setting of some | |
255 | -- restriction (e.g. No_IO restricts the loading of unit Ada.Text_IO). | |
256 | -- If a restriction exists post error message at the given node. | |
257 | ||
6e937c1c | 258 | procedure Check_Restriction |
23685ae6 AC |
259 | (Msg_Issued : out Boolean; |
260 | R : Restriction_Id; | |
261 | N : Node_Id; | |
262 | V : Uint := Uint_Minus_1); | |
19235870 | 263 | -- Checks that the given restriction is not set, and if it is set, an |
23685ae6 AC |
264 | -- appropriate message is posted on the given node, in which case |
265 | -- Msg_Issued is set to True (and False otherwise). Also records the | |
9b7c38af RD |
266 | -- violation in the appropriate internal arrays. Note that it is mandatory |
267 | -- to always use this routine to check if a restriction is violated. Such | |
268 | -- checks must never be done directly by the caller, since otherwise | |
269 | -- violations in the absence of restrictions are not properly recorded. The | |
270 | -- value of V is relevant only for parameter restrictions, and in this case | |
271 | -- indicates the exact count for the violation. If the exact count is not | |
272 | -- known, V is left at its default of -1 which indicates an unknown count. | |
19235870 | 273 | |
23685ae6 | 274 | procedure Check_Restriction |
e917aec2 RD |
275 | (R : Restriction_Id; |
276 | N : Node_Id; | |
277 | V : Uint := Uint_Minus_1); | |
23685ae6 AC |
278 | -- Wrapper on Check_Restriction with Msg_Issued, with the out-parameter |
279 | -- being ignored here. | |
280 | ||
5f3ab6fb AC |
281 | procedure Check_Restriction_No_Dependence (U : Node_Id; Err : Node_Id); |
282 | -- Called when a dependence on a unit is created (either implicitly, or by | |
e917aec2 RD |
283 | -- an explicit WITH clause). U is a node for the unit involved, and Err is |
284 | -- the node to which an error will be attached if necessary. | |
5f3ab6fb | 285 | |
e7fceebc | 286 | procedure Check_Restriction_No_Specification_Of_Aspect (N : Node_Id); |
d4175ef4 GL |
287 | -- N is the node id for an N_Aspect_Specification, an N_Pragma, or an |
288 | -- N_Attribute_Definition_Clause. An error message (warning) will be issued | |
289 | -- if a restriction (warning) was previously set for this aspect using | |
290 | -- Set_No_Specification_Of_Aspect. | |
e7fceebc | 291 | |
18dae814 | 292 | procedure Check_Restriction_No_Use_Of_Attribute (N : Node_Id); |
58ba2415 HK |
293 | -- N denotes an attribute definition clause or an attribute reference. An |
294 | -- error message (warning) will be issued if a restriction (warning) was | |
295 | -- previously set for this attribute using Set_No_Use_Of_Attribute. | |
18dae814 RD |
296 | |
297 | procedure Check_Restriction_No_Use_Of_Entity (N : Node_Id); | |
298 | -- N is the node id for an entity reference. An error message (warning) | |
07fbef62 | 299 | -- will be issued if a restriction (warning) was previously set for this |
18dae814 RD |
300 | -- entity name using Set_No_Use_Of_Entity. |
301 | ||
302 | procedure Check_Restriction_No_Use_Of_Pragma (N : Node_Id); | |
303 | -- N is the node of a pragma. An error message (warning) will be issued | |
304 | -- if a restriction (warning) was previously set for this pragma using | |
305 | -- Set_No_Use_Of_Pragma. | |
306 | ||
19235870 RK |
307 | procedure Check_Elaboration_Code_Allowed (N : Node_Id); |
308 | -- Tests to see if elaboration code is allowed by the current restrictions | |
e917aec2 RD |
309 | -- settings. This function is called by Gigi when it needs to define an |
310 | -- elaboration routine. If elaboration code is not allowed, an error | |
19235870 RK |
311 | -- message is posted on the node given as argument. |
312 | ||
c7732bbe EB |
313 | -- WARNING: There is a matching C declaration of this subprogram in fe.h |
314 | ||
a4901c08 AC |
315 | procedure Check_No_Implicit_Aliasing (Obj : Node_Id); |
316 | -- Obj is a node for which Is_Aliased_View is True, which is being used in | |
317 | -- a context (e.g. 'Access) where no implicit aliasing is allowed if the | |
318 | -- restriction No_Implicit_Aliasing is set. This procedure checks for the | |
319 | -- case where the restriction is active and Obj does not meet the required | |
320 | -- rules for avoiding implicit aliases, and issues a restriction message. | |
321 | ||
cadf64d1 BD |
322 | procedure Check_Implicit_Dynamic_Code_Allowed (N : Node_Id); |
323 | -- Tests to see if dynamic code generation (dynamically generated | |
324 | -- trampolines, in particular) is allowed by the current restrictions | |
325 | -- settings. This function is called by Gigi when it needs to generate code | |
326 | -- that generates a trampoline. If not allowed, an error message is posted | |
327 | -- on the node given as argument. | |
328 | ||
c7732bbe EB |
329 | -- WARNING: There is a matching C declaration of this subprogram in fe.h |
330 | ||
fbf5a39b AC |
331 | procedure Check_No_Implicit_Heap_Alloc (N : Node_Id); |
332 | -- Equivalent to Check_Restriction (No_Implicit_Heap_Allocations, N). | |
333 | -- Provided for easy use by back end, which has to check this restriction. | |
19235870 | 334 | |
c7732bbe | 335 | -- WARNING: There is a matching C declaration of this subprogram in fe.h |
c96c518f AC |
336 | |
337 | procedure Check_No_Implicit_Protected_Alloc (N : Node_Id); | |
338 | -- Equivalent to: | |
339 | -- Check_Restriction (No_Implicit_Protected_Object_Allocations, N) | |
340 | -- Provided for easy use by back end, which has to check this restriction. | |
341 | ||
c7732bbe EB |
342 | -- WARNING: There is a matching C declaration of this subprogram in fe.h |
343 | ||
344 | procedure Check_No_Implicit_Task_Alloc (N : Node_Id); | |
345 | -- Equivalent to Check_Restriction (No_Implicit_Task_Allocations, N). | |
346 | -- Provided for easy use by back end, which has to check this restriction. | |
347 | ||
348 | -- WARNING: There is a matching C declaration of this subprogram in fe.h | |
349 | ||
b5c739f9 RD |
350 | procedure Check_Obsolescent_2005_Entity (E : Entity_Id; N : Node_Id); |
351 | -- This routine checks if the entity E is one of the obsolescent entries | |
352 | -- in Ada.Characters.Handling in Ada 2005 and No_Obsolescent_Features | |
353 | -- restriction is active. If so an appropriate message is given. N is | |
354 | -- the node on which the message is to be placed. It's a bit kludgy to | |
355 | -- have this highly specialized routine rather than some wonderful general | |
356 | -- mechanism (e.g. a special pragma) to handle this case, but there are | |
357 | -- only six cases, and it is not worth the effort to do something general. | |
358 | ||
30196a76 RD |
359 | procedure Check_Wide_Character_Restriction (E : Entity_Id; N : Node_Id); |
360 | -- This procedure checks if the No_Wide_Character restriction is active, | |
361 | -- and if so, if N Comes_From_Source, and the root type of E is one of | |
362 | -- [Wide_]Wide_Character or [Wide_]Wide_String, then the restriction | |
363 | -- violation is recorded, and an appropriate message given. | |
364 | ||
19235870 | 365 | function Get_Restriction_Id |
6e937c1c | 366 | (N : Name_Id) return Restriction_Id; |
19235870 | 367 | -- Given an identifier name, determines if it is a valid restriction |
052e0603 AC |
368 | -- identifier, and if so returns the corresponding Restriction_Id value, |
369 | -- otherwise returns Not_A_Restriction_Id. | |
19235870 | 370 | |
2cbac6c6 AC |
371 | function OK_No_Dependence_Unit_Name (N : Node_Id) return Boolean; |
372 | -- Used in checking No_Dependence argument of pragma Restrictions or | |
373 | -- pragma Restrictions_Warning, or attribute Restriction_Set. Returns | |
374 | -- True if N has the proper form for a unit name, False otherwise. | |
375 | ||
18dae814 RD |
376 | function OK_No_Use_Of_Entity_Name (N : Node_Id) return Boolean; |
377 | -- Used in checking No_Use_Of_Entity argument of pragma Restrictions or | |
378 | -- pragma Restrictions_Warning, or attribute Restriction_Set. Returns | |
379 | -- True if N has the proper form for an entity name, False otherwise. | |
380 | ||
bcb8c3bb JS |
381 | function No_Dynamic_Accessibility_Checks_Enabled |
382 | (N : Node_Id) return Boolean; | |
383 | -- Test to see if the current restrictions settings specify that | |
384 | -- No_Dynamic_Accessibility_Checks is activated. | |
385 | ||
386 | -- N is currently unused, but is reserved for future use and debugging | |
387 | -- purposes to provide more context on a node for which an accessibility | |
388 | -- check is being performed or generated (e.g. is N in a predefined unit). | |
389 | ||
fbf5a39b AC |
390 | function No_Exception_Handlers_Set return Boolean; |
391 | -- Test to see if current restrictions settings specify that no exception | |
392 | -- handlers are present. This function is called by Gigi when it needs to | |
6790c865 AC |
393 | -- expand an AT END clean up identifier with no exception handler. True |
394 | -- will be returned if the configurable run-time is activated, and either | |
395 | -- of the restrictions No_Exception_Handlers or No_Exception_Propagation is | |
396 | -- set. In the latter case, the source may contain handlers but they either | |
397 | -- get converted using the local goto transformation or deleted. | |
19235870 | 398 | |
c7732bbe EB |
399 | -- WARNING: There is a matching C declaration of this subprogram in fe.h |
400 | ||
06eab6a7 RD |
401 | function No_Exception_Propagation_Active return Boolean; |
402 | -- Test to see if current restrictions settings specify that no | |
403 | -- exception propagation is activated. | |
404 | ||
cc335f43 | 405 | function Process_Restriction_Synonyms (N : Node_Id) return Name_Id; |
727e7b1a AC |
406 | -- Id is a node whose Chars field contains the name of a restriction. |
407 | -- If it is one of synonyms that we allow for historical purposes (for | |
408 | -- list see System.Rident), then the proper official name is returned. | |
b5e792e2 | 409 | |
6e937c1c AC |
410 | function Restriction_Active (R : All_Restrictions) return Boolean; |
411 | pragma Inline (Restriction_Active); | |
412 | -- Determines if a given restriction is active. This call should only be | |
413 | -- used where the compiled code depends on whether the restriction is | |
de397a3d AC |
414 | -- active. Always use Check_Restriction to record a violation. Note that |
415 | -- this returns False if we only have a Restriction_Warnings set, since | |
7a963087 RD |
416 | -- restriction warnings should never affect generated code. If you want |
417 | -- to know if a call to Check_Restriction is needed then use the function | |
418 | -- Restriction_Check_Required instead. | |
419 | ||
420 | function Restriction_Check_Required (R : All_Restrictions) return Boolean; | |
421 | pragma Inline (Restriction_Check_Required); | |
422 | -- Determines if either a Restriction_Warnings or Restrictions pragma has | |
423 | -- been given for the specified restriction. If true, then a subsequent | |
424 | -- call to Check_Restriction is required if the restriction is violated. | |
425 | -- This must not be used to guard code generation that depends on whether | |
426 | -- a restriction is active (see Restriction_Active above). Typically it | |
427 | -- is used to avoid complex code to determine if a restriction is violated, | |
428 | -- executing this code only if needed. | |
6e937c1c | 429 | |
19235870 | 430 | function Restricted_Profile return Boolean; |
393525af AC |
431 | -- Tests if set of restrictions corresponding to Restricted_Tasking profile |
432 | -- is currently in effect (set by pragma Profile, or by an appropriate set | |
433 | -- of individual Restrictions pragmas). Returns True only if all the | |
434 | -- required restrictions are set. | |
cc335f43 | 435 | |
a7837c08 JM |
436 | procedure Set_Global_No_Tasking; |
437 | -- Used in call from Sem_Prag when restriction No_Tasking is set in the | |
438 | -- run-time package System or in a configuration pragmas file. | |
439 | ||
cc335f43 AC |
440 | procedure Set_Profile_Restrictions |
441 | (P : Profile_Name; | |
442 | N : Node_Id; | |
443 | Warn : Boolean); | |
23e6615e RD |
444 | -- Sets the set of restrictions associated with the given profile name. N |
445 | -- is the node of the construct to which error messages are to be attached | |
446 | -- as required. Warn is set True for the case of Profile_Warnings where the | |
447 | -- restrictions are set as warnings rather than legality requirements, and | |
448 | -- is also True for Profile if the Treat_Restrictions_As_Warnings flag is | |
449 | -- set. It is false for Profile if this flag is not set. | |
19235870 | 450 | |
6e937c1c AC |
451 | procedure Set_Restriction |
452 | (R : All_Boolean_Restrictions; | |
453 | N : Node_Id); | |
454 | -- N is a node (typically a pragma node) that has the effect of setting | |
455 | -- Boolean restriction R. The restriction is set in Restrictions, and | |
456 | -- also in Main_Restrictions if this is the main unit. | |
457 | ||
458 | procedure Set_Restriction | |
459 | (R : All_Parameter_Restrictions; | |
460 | N : Node_Id; | |
461 | V : Integer); | |
462 | -- Similar to the above, except that this is used for the case of a | |
463 | -- parameter restriction, and the corresponding value V is given. | |
464 | ||
47484baa BD |
465 | procedure Set_Restriction |
466 | (R : All_Restrictions; | |
467 | N : Node_Id; | |
468 | Warn : Boolean; | |
469 | V : Integer := Integer'First); | |
470 | -- Same as above two, except also takes care of setting the | |
471 | -- Restriction_Warnings flag. V is ignored for Boolean | |
472 | -- restrictions. | |
473 | -- | |
474 | -- If this is the first time we've seen this restriction, the warning flag | |
475 | -- is set to Warn. If this is a second or subsequent time, Warn = False | |
476 | -- wins; that is, errors always trump warnings. In that case, the warning | |
477 | -- flag can be set to False, but never to True. | |
478 | ||
5f3ab6fb | 479 | procedure Set_Restriction_No_Dependence |
9b7c38af RD |
480 | (Unit : Node_Id; |
481 | Warn : Boolean; | |
482 | Profile : Profile_Name := No_Profile); | |
052e0603 AC |
483 | -- Sets given No_Dependence restriction in table if not there already. Warn |
484 | -- is True if from Restriction_Warnings, or for Restrictions if the flag | |
23e6615e | 485 | -- Treat_Restrictions_As_Warnings is set. False if from Restrictions and |
9b7c38af RD |
486 | -- this flag is not set. Profile is set to a non-default value if the |
487 | -- No_Dependence restriction comes from a Profile pragma. | |
5f3ab6fb | 488 | |
e7fceebc | 489 | procedure Set_Restriction_No_Specification_Of_Aspect |
47484baa BD |
490 | (N : Node_Id; |
491 | Warn : Boolean); | |
e7fceebc AC |
492 | -- N is the node id for an identifier from a pragma Restrictions for the |
493 | -- No_Specification_Of_Aspect pragma. An error message will be issued if | |
494 | -- the identifier is not a valid aspect name. Warning is set True for the | |
495 | -- case of a Restriction_Warnings pragma specifying this restriction and | |
496 | -- False for a Restrictions pragma specifying this restriction. | |
497 | ||
596b25f9 AC |
498 | procedure Set_Restriction_No_Specification_Of_Aspect (A_Id : Aspect_Id); |
499 | -- Version used by Get_Target_Parameters (via Tbuild) | |
500 | ||
57f4c288 | 501 | procedure Set_Restriction_No_Use_Of_Attribute |
47484baa BD |
502 | (N : Node_Id; |
503 | Warn : Boolean); | |
57f4c288 ES |
504 | -- N is the node id for the identifier in a pragma Restrictions for |
505 | -- No_Use_Of_Attribute. Caller has verified that this is a valid attribute | |
506 | -- designator. | |
507 | ||
596b25f9 AC |
508 | procedure Set_Restriction_No_Use_Of_Attribute (A_Id : Attribute_Id); |
509 | -- Version used by Get_Target_Parameters (via Tbuild) | |
510 | ||
18dae814 RD |
511 | procedure Set_Restriction_No_Use_Of_Entity |
512 | (Entity : Node_Id; | |
47484baa | 513 | Warn : Boolean; |
18dae814 RD |
514 | Profile : Profile_Name := No_Profile); |
515 | -- Sets given No_Use_Of_Entity restriction in table if not there already. | |
516 | -- Warn is True if from Restriction_Warnings, or for Restrictions if the | |
517 | -- flag Treat_Restrictions_As_Warnings is set. False if from Restrictions | |
518 | -- and this flag is not set. Profile is set to a non-default value if the | |
519 | -- No_Dependence restriction comes from a Profile pragma. This procedure | |
520 | -- also takes care of setting the Boolean2 flag of the simple name for | |
14f73211 | 521 | -- the entity (to optimize table searches). |
18dae814 | 522 | |
57f4c288 | 523 | procedure Set_Restriction_No_Use_Of_Pragma |
47484baa BD |
524 | (N : Node_Id; |
525 | Warn : Boolean); | |
57f4c288 ES |
526 | -- N is the node id for the identifier in a pragma Restrictions for |
527 | -- No_Use_Of_Pragma. Caller has verified that this is a valid pragma id. | |
528 | ||
596b25f9 AC |
529 | procedure Set_Restriction_No_Use_Of_Pragma (A_Id : Pragma_Id); |
530 | -- Version used in call from Get_Target_Parameters (via Tbuild). | |
531 | ||
19235870 RK |
532 | function Tasking_Allowed return Boolean; |
533 | pragma Inline (Tasking_Allowed); | |
9b7c38af RD |
534 | -- Tests if tasking operations are allowed by the current restrictions |
535 | -- settings. For tasking to be allowed Max_Tasks must be non-zero. | |
19235870 | 536 | |
a7837c08 JM |
537 | function Global_No_Tasking return Boolean; |
538 | -- Returns True if the restriction No_Tasking is set in the run-time | |
539 | -- package System or in a configuration pragmas file. | |
540 | ||
51fb9b73 RD |
541 | ---------------------------------------------- |
542 | -- Handling of Boolean Compilation Switches -- | |
543 | ---------------------------------------------- | |
544 | ||
545 | -- The following declarations are used for proper saving and restoring of | |
546 | -- restrictions for separate compilation units. There are two cases: | |
547 | ||
548 | -- For partition-wide restrictions, we just let the restrictions pragmas | |
549 | -- pile up, and we never reset them. We might as well detect what we can | |
550 | -- at compile time. If e.g. a with'ed unit has a restriction for one of | |
551 | -- the partition-wide restrictions, then the binder will enforce it on | |
552 | -- all units in the partition, including the unit with the WITH. Although | |
553 | -- it would not be wrong to leave this till bind time, we might as well | |
554 | -- flag it earlier at compile time. | |
555 | ||
556 | -- For non-partition-wide restrictions, we have quite a different state | |
557 | -- of affairs. Here it would be quite wrong to carry a restriction from | |
558 | -- a with'ed unit to another with'ed unit, or from a package spec to the | |
559 | -- package body. This means that we have to reset these non-partition | |
560 | -- wide restrictions at the start of each separate compilation unit. For | |
561 | -- units in the extended main program, we need to reset them all to the | |
562 | -- values set by the configuration pragma file(s). For units not in the | |
563 | -- extended main program, e.g. with'ed units, we might as well reset all | |
564 | -- of these restrictions to off (False). The actual initial values will | |
565 | -- be taken from the config files active when those units are compiled | |
566 | -- as main units. | |
567 | ||
568 | type Save_Cunit_Boolean_Restrictions is private; | |
569 | -- Type used for saving and restoring compilation unit restrictions. | |
570 | ||
571 | function Cunit_Boolean_Restrictions_Save | |
572 | return Save_Cunit_Boolean_Restrictions; | |
573 | -- This function saves the compilation unit restriction settings, leaving | |
a2667f14 | 574 | -- them unchanged. This is used e.g. at the start of processing a context |
51fb9b73 RD |
575 | -- clause, so that the main unit restrictions can be restored after all |
576 | -- the with'ed units have been processed. | |
577 | ||
578 | procedure Cunit_Boolean_Restrictions_Restore | |
579 | (R : Save_Cunit_Boolean_Restrictions); | |
580 | -- This is the corresponding restore procedure to restore restrictions | |
581 | -- previously saved by Cunit_Boolean_Restrictions_Save. However it does | |
582 | -- not reset No_Elaboration_Code, this stays set if it was set before | |
583 | -- the call, and also if it is set before the call, then the Config | |
584 | -- setting is also updated to include this restriction. This is what | |
585 | -- implements the special handling of No_Elaboration_Code. | |
586 | ||
587 | procedure Save_Config_Cunit_Boolean_Restrictions; | |
588 | -- This saves the current compilation unit restrictions in an internal | |
589 | -- variable, and leaves them unchanged. This is called immediately after | |
590 | -- processing the configuration file pragmas, to record the restrictions | |
591 | -- set by these configuration file pragmas. | |
592 | ||
593 | procedure Restore_Config_Cunit_Boolean_Restrictions; | |
594 | -- This restores the value saved by the previous call to save config values | |
595 | -- saved by Save_Config_Cunit_Boolean_Restrictions. It is called at the | |
596 | -- start of processing a new unit that is part of the main sources (e.g. | |
597 | -- a package spec when the main unit is a package body). | |
598 | ||
599 | procedure Reset_Cunit_Boolean_Restrictions; | |
600 | -- Turns off all non-partition-wide boolean restrictions | |
601 | ||
602 | procedure Add_To_Config_Boolean_Restrictions (R : Restriction_Id); | |
603 | -- Add specified restriction to stored configuration boolean restrictions. | |
604 | -- This is used for handling the special case of No_Elaboration_Code. | |
605 | ||
19235870 | 606 | private |
6e937c1c AC |
607 | type Save_Cunit_Boolean_Restrictions is |
608 | array (Cunit_Boolean_Restrictions) of Boolean; | |
19235870 RK |
609 | -- Type used for saving and restoring compilation unit restrictions. |
610 | -- See Compilation_Unit_Restrictions_[Save|Restore] subprograms. | |
611 | ||
612 | end Restrict; |