File : restrict.ads
1 ------------------------------------------------------------------------------
2 -- --
3 -- GNAT COMPILER COMPONENTS --
4 -- --
5 -- R E S T R I C T --
6 -- --
7 -- S p e c --
8 -- --
9 -- Copyright (C) 1992-2015, Free Software Foundation, Inc. --
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- --
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. 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 COPYING3. If not, go to --
19 -- http://www.gnu.org/licenses for a complete copy of the license. --
20 -- --
21 -- GNAT was originally developed by the GNAT team at New York University. --
22 -- Extensive contributions were provided by Ada Core Technologies Inc. --
23 -- --
24 ------------------------------------------------------------------------------
25
26 -- This package deals with the implementation of the Restrictions pragma
27
28 with Aspects; use Aspects;
29 with Namet; use Namet;
30 with Rident; use Rident;
31 with Snames; use Snames;
32 with Table;
33 with Types; use Types;
34 with Uintp; use Uintp;
35
36 package Restrict is
37
38 Restrictions : Restrictions_Info := No_Restrictions;
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
42 -- etc., since we may as well check as much as we can at compile time.
43 -- These variables should not be referenced directly by clients. Instead
44 -- use Check_Restriction to record a violation of a restriction, and
45 -- Restriction_Active to test if a given restriction is active.
46
47 Restrictions_Loc : array (All_Restrictions) of Source_Ptr :=
48 (others => No_Location);
49 -- Locations of Restrictions pragmas for error message purposes.
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.
54
55 Restriction_Profile_Name : array (All_Restrictions) of Profile_Name;
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
58 -- restriction was set by a Profile or Profile_Warnings pragma. The value
59 -- is No_Profile in all other cases.
60
61 Main_Restrictions : Restrictions_Info := No_Restrictions;
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.
66
67 Restriction_Warnings : Rident.Restriction_Flags := (others => False);
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.
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.
75
76 -- The following declarations establish a mapping between restriction
77 -- identifiers, and the names of corresponding restricted library units.
78
79 type Unit_Entry is record
80 Res_Id : Restriction_Id;
81 Filenm : String (1 .. 8);
82 end record;
83
84 Unit_Array : constant array (Positive range <>) of Unit_Entry := (
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"),
92 (No_IO, "a-direio"),
93 (No_IO, "directio"),
94 (No_IO, "a-sequio"),
95 (No_IO, "sequenio"),
96 (No_IO, "a-ststio"),
97 (No_IO, "a-textio"),
98 (No_IO, "text_io "),
99 (No_IO, "a-witeio"),
100 (No_Task_Attributes_Package, "a-tasatt"),
101 (No_Unchecked_Conversion, "a-unccon"),
102 (No_Unchecked_Conversion, "unchconv"),
103 (No_Unchecked_Deallocation, "a-uncdea"),
104 (No_Unchecked_Deallocation, "unchdeal"));
105
106 -- The following map has True for all GNAT-defined Restrictions. It is used
107 -- to implement pragma Restrictions (No_Implementation_Restrictions) (which
108 -- is why this restriction itself is excluded from the list).
109
110 Implementation_Restriction : constant array (All_Restrictions) of Boolean :=
111 (Simple_Barriers => True,
112 No_Calendar => True,
113 No_Default_Initialization => True,
114 No_Direct_Boolean_Operators => True,
115 No_Dispatching_Calls => True,
116 No_Dynamic_Attachment => True,
117 No_Elaboration_Code => True,
118 No_Enumeration_Maps => True,
119 No_Entry_Calls_In_Elaboration_Code => True,
120 No_Entry_Queue => True,
121 No_Exception_Handlers => True,
122 No_Exception_Propagation => True,
123 No_Exception_Registration => True,
124 No_Finalization => True,
125 No_Fixed_IO => True,
126 No_Implementation_Attributes => True,
127 No_Implementation_Pragmas => True,
128 No_Implicit_Conditionals => True,
129 No_Implicit_Aliasing => True,
130 No_Implicit_Dynamic_Code => True,
131 No_Implicit_Loops => True,
132 No_Initialize_Scalars => True,
133 No_Local_Protected_Objects => True,
134 No_Long_Long_Integers => True,
135 No_Multiple_Elaboration => True,
136 No_Protected_Type_Allocators => True,
137 No_Relative_Delay => True,
138 No_Requeue_Statements => True,
139 No_Secondary_Stack => True,
140 No_Select_Statements => True,
141 No_Standard_Storage_Pools => True,
142 No_Stream_Optimizations => True,
143 No_Streams => True,
144 No_Task_Attributes_Package => True,
145 No_Task_Termination => True,
146 No_Tasking => True,
147 No_Wide_Characters => True,
148 Static_Priorities => True,
149 Static_Storage_Size => True,
150 Pure_Barriers => True,
151 SPARK_05 => True,
152 others => False);
153
154 --------------------------
155 -- No_Dependences Table --
156 --------------------------
157
158 -- The following table records entries made by Restrictions pragmas
159 -- that specify a parameter for No_Dependence. Each such pragma makes
160 -- an entry in this table.
161
162 -- Note: we have chosen to implement this restriction in the "syntactic"
163 -- form, where we do not check that the named package is a language defined
164 -- package, but instead we allow arbitrary package names. The discussion of
165 -- this issue is not complete in the ARG, but the sense seems to be leaning
166 -- in this direction, which makes more sense to us, since it is much more
167 -- useful, and much easier to implement.
168
169 type ND_Entry is record
170 Unit : Node_Id;
171 -- The unit parameter from the No_Dependence pragma
172
173 Warn : Boolean;
174 -- True if from Restriction_Warnings, False if from Restrictions
175
176 Profile : Profile_Name;
177 -- Set to name of profile from which No_Dependence entry came, or to
178 -- No_Profile if a pragma Restriction set the No_Dependence entry.
179 end record;
180
181 package No_Dependences is new Table.Table (
182 Table_Component_Type => ND_Entry,
183 Table_Index_Type => Int,
184 Table_Low_Bound => 0,
185 Table_Initial => 200,
186 Table_Increment => 200,
187 Table_Name => "Name_No_Dependences");
188
189 ----------------------------
190 -- No_Use_Of_Entity Table --
191 ----------------------------
192
193 -- The following table records entries made by Restrictions pragmas
194 -- that specify a parameter for No_Use_Of_Entity. Each such pragma makes
195 -- an entry in this table.
196
197 -- Note: we have chosen to implement this restriction in the "syntactic"
198 -- form, where we allow arbitrary fully qualified names to be specified.
199
200 type NE_Entry is record
201 Entity : Node_Id;
202 -- The entity parameter from the No_Use_Of_Entity pragma. This is in
203 -- the form of a selected component, since that is the way the parser
204 -- processes it, and we don't further analyze it.
205
206 Warn : Boolean;
207 -- True if from Restriction_Warnings, False if from Restrictions
208
209 Profile : Profile_Name;
210 -- Set to name of profile from which No_Use_Of_Entity entry came, or to
211 -- No_Profile if a pragma Restriction set the No_Use_Of_Entity entry.
212 end record;
213
214 package No_Use_Of_Entity is new Table.Table (
215 Table_Component_Type => NE_Entry,
216 Table_Index_Type => Int,
217 Table_Low_Bound => 0,
218 Table_Initial => 200,
219 Table_Increment => 200,
220 Table_Name => "Name_No_Use_Of_Entity");
221
222 -- Note that in addition to making an entry in this table, we also set the
223 -- Boolean2 flag of the Name_Table entry for the simple name of the entity.
224 -- This is used to avoid most useless searches of this table.
225
226 -----------------
227 -- Subprograms --
228 -----------------
229
230 -- Note: several of these subprograms can generate error messages (e.g.
231 -- Check_Restriction). These routines should be called in the analyzer
232 -- rather than the expander, so that the associated error messages are
233 -- correctly generated in semantics only (-gnatc) mode.
234
235 function Abort_Allowed return Boolean;
236 pragma Inline (Abort_Allowed);
237 -- Tests to see if abort is allowed by the current restrictions settings.
238 -- For abort to be allowed, either No_Abort_Statements must be False,
239 -- or Max_Asynchronous_Select_Nesting must be non-zero.
240
241 procedure Check_Compiler_Unit (Feature : String; N : Node_Id);
242 -- If unit N is in a unit that has a pragma Compiler_Unit_Warning, then
243 -- a message is posted on node N noting use of the given feature is not
244 -- permitted in the compiler (bootstrap considerations).
245
246 procedure Check_Compiler_Unit (Feature : String; Loc : Source_Ptr);
247 -- If unit N is in a unit that has a pragma Compiler_Unit_Warning, then a
248 -- message is posted at location Loc noting use of the given feature is not
249 -- permitted in the compiler (bootstrap considerations).
250
251 procedure Check_Restricted_Unit (U : Unit_Name_Type; N : Node_Id);
252 -- Checks if loading of unit U is prohibited by the setting of some
253 -- restriction (e.g. No_IO restricts the loading of unit Ada.Text_IO).
254 -- If a restriction exists post error message at the given node.
255
256 procedure Check_Restriction
257 (Msg_Issued : out Boolean;
258 R : Restriction_Id;
259 N : Node_Id;
260 V : Uint := Uint_Minus_1);
261 -- Checks that the given restriction is not set, and if it is set, an
262 -- appropriate message is posted on the given node, in which case
263 -- Msg_Issued is set to True (and False otherwise). Also records the
264 -- violation in the appropriate internal arrays. Note that it is mandatory
265 -- to always use this routine to check if a restriction is violated. Such
266 -- checks must never be done directly by the caller, since otherwise
267 -- violations in the absence of restrictions are not properly recorded. The
268 -- value of V is relevant only for parameter restrictions, and in this case
269 -- indicates the exact count for the violation. If the exact count is not
270 -- known, V is left at its default of -1 which indicates an unknown count.
271
272 procedure Check_Restriction
273 (R : Restriction_Id;
274 N : Node_Id;
275 V : Uint := Uint_Minus_1);
276 -- Wrapper on Check_Restriction with Msg_Issued, with the out-parameter
277 -- being ignored here.
278
279 procedure Check_Restriction_No_Dependence (U : Node_Id; Err : Node_Id);
280 -- Called when a dependence on a unit is created (either implicitly, or by
281 -- an explicit WITH clause). U is a node for the unit involved, and Err is
282 -- the node to which an error will be attached if necessary.
283
284 procedure Check_Restriction_No_Specification_Of_Aspect (N : Node_Id);
285 -- N is the node id for an N_Aspect_Specification. An error message
286 -- (warning) will be issued if a restriction (warning) was previously set
287 -- for this aspect using Set_No_Specification_Of_Aspect.
288
289 procedure Check_Restriction_No_Use_Of_Attribute (N : Node_Id);
290 -- N denotes an attribute definition clause or an attribute reference. An
291 -- error message (warning) will be issued if a restriction (warning) was
292 -- previously set for this attribute using Set_No_Use_Of_Attribute.
293
294 procedure Check_Restriction_No_Use_Of_Entity (N : Node_Id);
295 -- N is the node id for an entity reference. An error message (warning)
296 -- will be issued if a restriction (warning) was previously set for this
297 -- entity name using Set_No_Use_Of_Entity.
298
299 procedure Check_Restriction_No_Use_Of_Pragma (N : Node_Id);
300 -- N is the node of a pragma. An error message (warning) will be issued
301 -- if a restriction (warning) was previously set for this pragma using
302 -- Set_No_Use_Of_Pragma.
303
304 procedure Check_Elaboration_Code_Allowed (N : Node_Id);
305 -- Tests to see if elaboration code is allowed by the current restrictions
306 -- settings. This function is called by Gigi when it needs to define an
307 -- elaboration routine. If elaboration code is not allowed, an error
308 -- message is posted on the node given as argument.
309
310 procedure Check_SPARK_05_Restriction
311 (Msg : String;
312 N : Node_Id;
313 Force : Boolean := False);
314 -- Node N represents a construct not allowed in SPARK_05 mode. If this is
315 -- a source node, or if the restriction is forced (Force = True), and
316 -- the SPARK_05 restriction is set, then an error is issued on N. Msg
317 -- is appended to the restriction failure message.
318
319 procedure Check_SPARK_05_Restriction
320 (Msg1 : String;
321 Msg2 : String;
322 N : Node_Id);
323 -- Same as Check_SPARK_05_Restriction except there is a continuation
324 -- message Msg2 following the initial message Msg1.
325
326 procedure Check_No_Implicit_Aliasing (Obj : Node_Id);
327 -- Obj is a node for which Is_Aliased_View is True, which is being used in
328 -- a context (e.g. 'Access) where no implicit aliasing is allowed if the
329 -- restriction No_Implicit_Aliasing is set. This procedure checks for the
330 -- case where the restriction is active and Obj does not meet the required
331 -- rules for avoiding implicit aliases, and issues a restriction message.
332
333 procedure Check_Implicit_Dynamic_Code_Allowed (N : Node_Id);
334 -- Tests to see if dynamic code generation (dynamically generated
335 -- trampolines, in particular) is allowed by the current restrictions
336 -- settings. This function is called by Gigi when it needs to generate code
337 -- that generates a trampoline. If not allowed, an error message is posted
338 -- on the node given as argument.
339
340 procedure Check_No_Implicit_Heap_Alloc (N : Node_Id);
341 -- Equivalent to Check_Restriction (No_Implicit_Heap_Allocations, N).
342 -- Provided for easy use by back end, which has to check this restriction.
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 procedure Check_No_Implicit_Protected_Alloc (N : Node_Id);
349 -- Equivalent to:
350 -- Check_Restriction (No_Implicit_Protected_Object_Allocations, N)
351 -- Provided for easy use by back end, which has to check this restriction.
352
353 procedure Check_Obsolescent_2005_Entity (E : Entity_Id; N : Node_Id);
354 -- This routine checks if the entity E is one of the obsolescent entries
355 -- in Ada.Characters.Handling in Ada 2005 and No_Obsolescent_Features
356 -- restriction is active. If so an appropriate message is given. N is
357 -- the node on which the message is to be placed. It's a bit kludgy to
358 -- have this highly specialized routine rather than some wonderful general
359 -- mechanism (e.g. a special pragma) to handle this case, but there are
360 -- only six cases, and it is not worth the effort to do something general.
361
362 procedure Check_Wide_Character_Restriction (E : Entity_Id; N : Node_Id);
363 -- This procedure checks if the No_Wide_Character restriction is active,
364 -- and if so, if N Comes_From_Source, and the root type of E is one of
365 -- [Wide_]Wide_Character or [Wide_]Wide_String, then the restriction
366 -- violation is recorded, and an appropriate message given.
367
368 function Get_Restriction_Id
369 (N : Name_Id) return Restriction_Id;
370 -- Given an identifier name, determines if it is a valid restriction
371 -- identifier, and if so returns the corresponding Restriction_Id value,
372 -- otherwise returns Not_A_Restriction_Id.
373
374 function OK_No_Dependence_Unit_Name (N : Node_Id) return Boolean;
375 -- Used in checking No_Dependence argument of pragma Restrictions or
376 -- pragma Restrictions_Warning, or attribute Restriction_Set. Returns
377 -- True if N has the proper form for a unit name, False otherwise.
378
379 function OK_No_Use_Of_Entity_Name (N : Node_Id) return Boolean;
380 -- Used in checking No_Use_Of_Entity argument of pragma Restrictions or
381 -- pragma Restrictions_Warning, or attribute Restriction_Set. Returns
382 -- True if N has the proper form for an entity name, False otherwise.
383
384 function Is_In_Hidden_Part_In_SPARK (Loc : Source_Ptr) return Boolean;
385 -- Determine if given location is covered by a hidden region range in the
386 -- SPARK hides table.
387
388 function No_Exception_Handlers_Set return Boolean;
389 -- Test to see if current restrictions settings specify that no exception
390 -- handlers are present. This function is called by Gigi when it needs to
391 -- expand an AT END clean up identifier with no exception handler. True
392 -- will be returned if the configurable run-time is activated, and either
393 -- of the restrictions No_Exception_Handlers or No_Exception_Propagation is
394 -- set. In the latter case, the source may contain handlers but they either
395 -- get converted using the local goto transformation or deleted.
396
397 function No_Exception_Propagation_Active return Boolean;
398 -- Test to see if current restrictions settings specify that no
399 -- exception propagation is activated.
400
401 function Process_Restriction_Synonyms (N : Node_Id) return Name_Id;
402 -- Id is a node whose Chars field contains the name of a restriction.
403 -- If it is one of synonyms that we allow for historical purposes (for
404 -- list see System.Rident), then the proper official name is returned.
405
406 function Restriction_Active (R : All_Restrictions) return Boolean;
407 pragma Inline (Restriction_Active);
408 -- Determines if a given restriction is active. This call should only be
409 -- used where the compiled code depends on whether the restriction is
410 -- active. Always use Check_Restriction to record a violation. Note that
411 -- this returns False if we only have a Restriction_Warnings set, since
412 -- restriction warnings should never affect generated code. If you want
413 -- to know if a call to Check_Restriction is needed then use the function
414 -- Restriction_Check_Required instead.
415
416 function Restriction_Check_Required (R : All_Restrictions) return Boolean;
417 pragma Inline (Restriction_Check_Required);
418 -- Determines if either a Restriction_Warnings or Restrictions pragma has
419 -- been given for the specified restriction. If true, then a subsequent
420 -- call to Check_Restriction is required if the restriction is violated.
421 -- This must not be used to guard code generation that depends on whether
422 -- a restriction is active (see Restriction_Active above). Typically it
423 -- is used to avoid complex code to determine if a restriction is violated,
424 -- executing this code only if needed.
425
426 function Restricted_Profile return Boolean;
427 -- Tests if set of restrictions corresponding to Profile (Restricted) is
428 -- currently in effect (set by pragma Profile, or by an appropriate set of
429 -- individual Restrictions pragmas). Returns True only if all the required
430 -- restrictions are set.
431
432 procedure Set_Hidden_Part_In_SPARK (Loc1, Loc2 : Source_Ptr);
433 -- Insert a new hidden region range in the SPARK hides table. The effect
434 -- is to hide any SPARK violation messages which are in the range Loc1 to
435 -- Loc2-1 (i.e. Loc2 is the first location for reenabling checks).
436
437 procedure Set_Profile_Restrictions
438 (P : Profile_Name;
439 N : Node_Id;
440 Warn : Boolean);
441 -- Sets the set of restrictions associated with the given profile name. N
442 -- is the node of the construct to which error messages are to be attached
443 -- as required. Warn is set True for the case of Profile_Warnings where the
444 -- restrictions are set as warnings rather than legality requirements, and
445 -- is also True for Profile if the Treat_Restrictions_As_Warnings flag is
446 -- set. It is false for Profile if this flag is not set.
447
448 procedure Set_Restriction
449 (R : All_Boolean_Restrictions;
450 N : Node_Id);
451 -- N is a node (typically a pragma node) that has the effect of setting
452 -- Boolean restriction R. The restriction is set in Restrictions, and
453 -- also in Main_Restrictions if this is the main unit.
454
455 procedure Set_Restriction
456 (R : All_Parameter_Restrictions;
457 N : Node_Id;
458 V : Integer);
459 -- Similar to the above, except that this is used for the case of a
460 -- parameter restriction, and the corresponding value V is given.
461
462 procedure Set_Restriction_No_Dependence
463 (Unit : Node_Id;
464 Warn : Boolean;
465 Profile : Profile_Name := No_Profile);
466 -- Sets given No_Dependence restriction in table if not there already. Warn
467 -- is True if from Restriction_Warnings, or for Restrictions if the flag
468 -- Treat_Restrictions_As_Warnings is set. False if from Restrictions and
469 -- this flag is not set. Profile is set to a non-default value if the
470 -- No_Dependence restriction comes from a Profile pragma.
471
472 procedure Set_Restriction_No_Specification_Of_Aspect
473 (N : Node_Id;
474 Warning : Boolean);
475 -- N is the node id for an identifier from a pragma Restrictions for the
476 -- No_Specification_Of_Aspect pragma. An error message will be issued if
477 -- the identifier is not a valid aspect name. Warning is set True for the
478 -- case of a Restriction_Warnings pragma specifying this restriction and
479 -- False for a Restrictions pragma specifying this restriction.
480
481 procedure Set_Restriction_No_Specification_Of_Aspect (A_Id : Aspect_Id);
482 -- Version used by Get_Target_Parameters (via Tbuild)
483
484 procedure Set_Restriction_No_Use_Of_Attribute
485 (N : Node_Id;
486 Warning : Boolean);
487 -- N is the node id for the identifier in a pragma Restrictions for
488 -- No_Use_Of_Attribute. Caller has verified that this is a valid attribute
489 -- designator.
490
491 procedure Set_Restriction_No_Use_Of_Attribute (A_Id : Attribute_Id);
492 -- Version used by Get_Target_Parameters (via Tbuild)
493
494 procedure Set_Restriction_No_Use_Of_Entity
495 (Entity : Node_Id;
496 Warning : Boolean;
497 Profile : Profile_Name := No_Profile);
498 -- Sets given No_Use_Of_Entity restriction in table if not there already.
499 -- Warn is True if from Restriction_Warnings, or for Restrictions if the
500 -- flag Treat_Restrictions_As_Warnings is set. False if from Restrictions
501 -- and this flag is not set. Profile is set to a non-default value if the
502 -- No_Dependence restriction comes from a Profile pragma. This procedure
503 -- also takes care of setting the Boolean2 flag of the simple name for
504 -- the entity (to optimize table searches).
505
506 procedure Set_Restriction_No_Use_Of_Pragma
507 (N : Node_Id;
508 Warning : Boolean);
509 -- N is the node id for the identifier in a pragma Restrictions for
510 -- No_Use_Of_Pragma. Caller has verified that this is a valid pragma id.
511
512 procedure Set_Restriction_No_Use_Of_Pragma (A_Id : Pragma_Id);
513 -- Version used in call from Get_Target_Parameters (via Tbuild).
514
515 function Tasking_Allowed return Boolean;
516 pragma Inline (Tasking_Allowed);
517 -- Tests if tasking operations are allowed by the current restrictions
518 -- settings. For tasking to be allowed Max_Tasks must be non-zero.
519
520 ----------------------------------------------
521 -- Handling of Boolean Compilation Switches --
522 ----------------------------------------------
523
524 -- The following declarations are used for proper saving and restoring of
525 -- restrictions for separate compilation units. There are two cases:
526
527 -- For partition-wide restrictions, we just let the restrictions pragmas
528 -- pile up, and we never reset them. We might as well detect what we can
529 -- at compile time. If e.g. a with'ed unit has a restriction for one of
530 -- the partition-wide restrictions, then the binder will enforce it on
531 -- all units in the partition, including the unit with the WITH. Although
532 -- it would not be wrong to leave this till bind time, we might as well
533 -- flag it earlier at compile time.
534
535 -- For non-partition-wide restrictions, we have quite a different state
536 -- of affairs. Here it would be quite wrong to carry a restriction from
537 -- a with'ed unit to another with'ed unit, or from a package spec to the
538 -- package body. This means that we have to reset these non-partition
539 -- wide restrictions at the start of each separate compilation unit. For
540 -- units in the extended main program, we need to reset them all to the
541 -- values set by the configuration pragma file(s). For units not in the
542 -- extended main program, e.g. with'ed units, we might as well reset all
543 -- of these restrictions to off (False). The actual initial values will
544 -- be taken from the config files active when those units are compiled
545 -- as main units.
546
547 type Save_Cunit_Boolean_Restrictions is private;
548 -- Type used for saving and restoring compilation unit restrictions.
549
550 function Cunit_Boolean_Restrictions_Save
551 return Save_Cunit_Boolean_Restrictions;
552 -- This function saves the compilation unit restriction settings, leaving
553 -- them unchanged. This is used e.g. at the start of processing a context
554 -- clause, so that the main unit restrictions can be restored after all
555 -- the with'ed units have been processed.
556
557 procedure Cunit_Boolean_Restrictions_Restore
558 (R : Save_Cunit_Boolean_Restrictions);
559 -- This is the corresponding restore procedure to restore restrictions
560 -- previously saved by Cunit_Boolean_Restrictions_Save. However it does
561 -- not reset No_Elaboration_Code, this stays set if it was set before
562 -- the call, and also if it is set before the call, then the Config
563 -- setting is also updated to include this restriction. This is what
564 -- implements the special handling of No_Elaboration_Code.
565
566 procedure Save_Config_Cunit_Boolean_Restrictions;
567 -- This saves the current compilation unit restrictions in an internal
568 -- variable, and leaves them unchanged. This is called immediately after
569 -- processing the configuration file pragmas, to record the restrictions
570 -- set by these configuration file pragmas.
571
572 procedure Restore_Config_Cunit_Boolean_Restrictions;
573 -- This restores the value saved by the previous call to save config values
574 -- saved by Save_Config_Cunit_Boolean_Restrictions. It is called at the
575 -- start of processing a new unit that is part of the main sources (e.g.
576 -- a package spec when the main unit is a package body).
577
578 procedure Reset_Cunit_Boolean_Restrictions;
579 -- Turns off all non-partition-wide boolean restrictions
580
581 procedure Add_To_Config_Boolean_Restrictions (R : Restriction_Id);
582 -- Add specified restriction to stored configuration boolean restrictions.
583 -- This is used for handling the special case of No_Elaboration_Code.
584
585 private
586 type Save_Cunit_Boolean_Restrictions is
587 array (Cunit_Boolean_Restrictions) of Boolean;
588 -- Type used for saving and restoring compilation unit restrictions.
589 -- See Compilation_Unit_Restrictions_[Save|Restore] subprograms.
590
591 end Restrict;