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) 1992-2014, 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 28with Namet; use Namet; 29with Rident; use Rident; 30with Table; 31with Types; use Types; 32with Uintp; use Uintp; 33 34package Restrict is 35 36 Restrictions : Restrictions_Info := No_Restrictions; 37 -- This variable records restrictions found in any units in the main 38 -- extended unit, and in the case of restrictions checked for partition 39 -- consistency, restrictions found in any with'ed units, parent specs 40 -- etc., since we may as well check as much as we can at compile time. 41 -- These variables should not be referenced directly by clients. Instead 42 -- use Check_Restriction to record a violation of a restriction, and 43 -- Restriction_Active to test if a given restriction is active. 44 45 Restrictions_Loc : array (All_Restrictions) of Source_Ptr := 46 (others => No_Location); 47 -- Locations of Restrictions pragmas for error message purposes. 48 -- Valid only if corresponding entry in Restrictions is set. A value 49 -- of No_Location is used for implicit restrictions set by another 50 -- pragma, and a value of System_Location is used for restrictions 51 -- set from package Standard by the processing in Targparm. 52 53 Restriction_Profile_Name : array (All_Restrictions) of Profile_Name; 54 -- Entries in this array are valid only if the corresponding restriction in 55 -- Restrictions is set. The value is the corresponding profile name if the 56 -- restriction was set by a Profile or Profile_Warnings pragma. The value 57 -- is No_Profile in all other cases. 58 59 Main_Restrictions : Restrictions_Info := No_Restrictions; 60 -- This variable records only restrictions found in any units of the 61 -- main extended unit. These are the variables used for ali file output, 62 -- since we want the binder to be able to accurately diagnose inter-unit 63 -- restriction violations. 64 65 Restriction_Warnings : Rident.Restriction_Flags := (others => False); 66 -- If one of these flags is set, then it means that violation of the 67 -- corresponding restriction results only in a warning message, not 68 -- in an error message, and the restriction is not otherwise enforced. 69 -- Note that the flags in Restrictions are set to indicate that the 70 -- restriction is set in this case, but Main_Restrictions is never 71 -- set if Restriction_Warnings is set, so this does not look like a 72 -- restriction to the binder. 73 74 -- The following declarations establish a mapping between restriction 75 -- identifiers, and the names of corresponding restricted library units. 76 77 type Unit_Entry is record 78 Res_Id : Restriction_Id; 79 Filenm : String (1 .. 8); 80 end record; 81 82 Unit_Array : constant array (Positive range <>) of Unit_Entry := ( 83 (No_Asynchronous_Control, "a-astaco"), 84 (No_Calendar, "a-calend"), 85 (No_Calendar, "calendar"), 86 (No_Delay, "a-calend"), 87 (No_Delay, "calendar"), 88 (No_Dynamic_Priorities, "a-dynpri"), 89 (No_Finalization, "a-finali"), 90 (No_IO, "a-direio"), 91 (No_IO, "directio"), 92 (No_IO, "a-sequio"), 93 (No_IO, "sequenio"), 94 (No_IO, "a-ststio"), 95 (No_IO, "a-textio"), 96 (No_IO, "text_io "), 97 (No_IO, "a-witeio"), 98 (No_Task_Attributes_Package, "a-tasatt"), 99 (No_Unchecked_Conversion, "a-unccon"), 100 (No_Unchecked_Conversion, "unchconv"), 101 (No_Unchecked_Deallocation, "a-uncdea"), 102 (No_Unchecked_Deallocation, "unchdeal")); 103 104 -- The following map has True for all GNAT-defined Restrictions. It is used 105 -- to implement pragma Restrictions (No_Implementation_Restrictions) (which 106 -- is why this restriction itself is excluded from the list). 107 108 Implementation_Restriction : array (All_Restrictions) of Boolean := 109 (Simple_Barriers => True, 110 No_Calendar => True, 111 No_Default_Initialization => True, 112 No_Direct_Boolean_Operators => True, 113 No_Dispatching_Calls => True, 114 No_Dynamic_Attachment => True, 115 No_Elaboration_Code => True, 116 No_Enumeration_Maps => True, 117 No_Entry_Calls_In_Elaboration_Code => True, 118 No_Entry_Queue => True, 119 No_Exception_Handlers => True, 120 No_Exception_Propagation => True, 121 No_Exception_Registration => True, 122 No_Finalization => True, 123 No_Fixed_IO => True, 124 No_Implementation_Attributes => True, 125 No_Implementation_Pragmas => True, 126 No_Implicit_Conditionals => True, 127 No_Implicit_Aliasing => True, 128 No_Implicit_Dynamic_Code => True, 129 No_Implicit_Loops => True, 130 No_Initialize_Scalars => True, 131 No_Local_Protected_Objects => True, 132 No_Long_Long_Integers => True, 133 No_Multiple_Elaboration => True, 134 No_Protected_Type_Allocators => True, 135 No_Relative_Delay => True, 136 No_Requeue_Statements => True, 137 No_Secondary_Stack => True, 138 No_Select_Statements => True, 139 No_Standard_Storage_Pools => True, 140 No_Stream_Optimizations => True, 141 No_Streams => True, 142 No_Task_Attributes_Package => True, 143 No_Task_Termination => True, 144 No_Tasking => True, 145 No_Wide_Characters => True, 146 Static_Priorities => True, 147 Static_Storage_Size => True, 148 SPARK_05 => True, 149 others => False); 150 151 -------------------------- 152 -- No_Dependences Table -- 153 -------------------------- 154 155 -- The following table records entries made by Restrictions pragmas 156 -- that specify a parameter for No_Dependence. Each such pragma makes 157 -- an entry in this table. 158 159 -- Note: we have chosen to implement this restriction in the "syntactic" 160 -- form, where we do not check that the named package is a language defined 161 -- package, but instead we allow arbitrary package names. The discussion of 162 -- this issue is not complete in the ARG, but the sense seems to be leaning 163 -- in this direction, which makes more sense to us, since it is much more 164 -- useful, and much easier to implement. 165 166 type ND_Entry is record 167 Unit : Node_Id; 168 -- The unit parameter from the No_Dependence pragma 169 170 Warn : Boolean; 171 -- True if from Restriction_Warnings, False if from Restrictions 172 173 Profile : Profile_Name; 174 -- Set to name of profile from which No_Dependence entry came, or to 175 -- No_Profile if a pragma Restriction set the No_Dependence entry. 176 end record; 177 178 package No_Dependences is new Table.Table ( 179 Table_Component_Type => ND_Entry, 180 Table_Index_Type => Int, 181 Table_Low_Bound => 0, 182 Table_Initial => 200, 183 Table_Increment => 200, 184 Table_Name => "Name_No_Dependences"); 185 186 ---------------------------- 187 -- No_Use_Of_Entity Table -- 188 ---------------------------- 189 190 -- The following table records entries made by Restrictions pragmas 191 -- that specify a parameter for No_Use_Of_Entity. Each such pragma makes 192 -- an entry in this table. 193 194 -- Note: we have chosen to implement this restriction in the "syntactic" 195 -- form, where we allow arbitrary fully qualified names to be specified. 196 197 type NE_Entry is record 198 Entity : Node_Id; 199 -- The entity parameter from the No_Use_Of_Entity pragma. This is in 200 -- the form of a selected component, since that is the way the parser 201 -- processes it, and we don't further analyze it. 202 203 Warn : Boolean; 204 -- True if from Restriction_Warnings, False if from Restrictions 205 206 Profile : Profile_Name; 207 -- Set to name of profile from which No_Use_Of_Entity entry came, or to 208 -- No_Profile if a pragma Restriction set the No_Use_Of_Entity entry. 209 end record; 210 211 package No_Use_Of_Entity is new Table.Table ( 212 Table_Component_Type => NE_Entry, 213 Table_Index_Type => Int, 214 Table_Low_Bound => 0, 215 Table_Initial => 200, 216 Table_Increment => 200, 217 Table_Name => "Name_No_Use_Of_Entity"); 218 219 -- Note that in addition to making an entry in this table, we also set the 220 -- Boolean2 flag of the Name_Table entry for the simple name of the entity. 221 -- This is used to avoid most useless searches of this table. 222 223 ----------------- 224 -- Subprograms -- 225 ----------------- 226 227 -- Note: several of these subprograms can generate error messages (e.g. 228 -- Check_Restriction). These routines should be called in the analyzer 229 -- rather than the expander, so that the associated error messages are 230 -- correctly generated in semantics only (-gnatc) mode. 231 232 function Abort_Allowed return Boolean; 233 pragma Inline (Abort_Allowed); 234 -- Tests to see if abort is allowed by the current restrictions settings. 235 -- For abort to be allowed, either No_Abort_Statements must be False, 236 -- or Max_Asynchronous_Select_Nesting must be non-zero. 237 238 procedure Check_Compiler_Unit (Feature : String; N : Node_Id); 239 -- If unit N is in a unit that has a pragma Compiler_Unit_Warning, then 240 -- a message is posted on node N noting use of the given feature is not 241 -- permitted in the compiler (bootstrap considerations). 242 243 procedure Check_Compiler_Unit (Feature : String; Loc : Source_Ptr); 244 -- If unit N is in a unit that has a pragma Compiler_Unit_Warning, then a 245 -- message is posted at location Loc noting use of the given feature is not 246 -- permitted in the compiler (bootstrap considerations). 247 248 procedure Check_Restricted_Unit (U : Unit_Name_Type; N : Node_Id); 249 -- Checks if loading of unit U is prohibited by the setting of some 250 -- restriction (e.g. No_IO restricts the loading of unit Ada.Text_IO). 251 -- If a restriction exists post error message at the given node. 252 253 procedure Check_Restriction 254 (Msg_Issued : out Boolean; 255 R : Restriction_Id; 256 N : Node_Id; 257 V : Uint := Uint_Minus_1); 258 -- Checks that the given restriction is not set, and if it is set, an 259 -- appropriate message is posted on the given node, in which case 260 -- Msg_Issued is set to True (and False otherwise). Also records the 261 -- violation in the appropriate internal arrays. Note that it is mandatory 262 -- to always use this routine to check if a restriction is violated. Such 263 -- checks must never be done directly by the caller, since otherwise 264 -- violations in the absence of restrictions are not properly recorded. The 265 -- value of V is relevant only for parameter restrictions, and in this case 266 -- indicates the exact count for the violation. If the exact count is not 267 -- known, V is left at its default of -1 which indicates an unknown count. 268 269 procedure Check_Restriction 270 (R : Restriction_Id; 271 N : Node_Id; 272 V : Uint := Uint_Minus_1); 273 -- Wrapper on Check_Restriction with Msg_Issued, with the out-parameter 274 -- being ignored here. 275 276 procedure Check_Restriction_No_Dependence (U : Node_Id; Err : Node_Id); 277 -- Called when a dependence on a unit is created (either implicitly, or by 278 -- an explicit WITH clause). U is a node for the unit involved, and Err is 279 -- the node to which an error will be attached if necessary. 280 281 procedure Check_Restriction_No_Specification_Of_Aspect (N : Node_Id); 282 -- N is the node id for an N_Aspect_Specification. An error message 283 -- (warning) will be issued if a restriction (warning) was previous set 284 -- for this aspect using Set_No_Specification_Of_Aspect. 285 286 procedure Check_Restriction_No_Use_Of_Attribute (N : Node_Id); 287 -- N is the node of an attribute definition clause. An error message 288 -- (warning) will be issued if a restriction (warning) was previously set 289 -- for this attribute using Set_No_Use_Of_Attribute. 290 291 procedure Check_Restriction_No_Use_Of_Entity (N : Node_Id); 292 -- N is the node id for an entity reference. An error message (warning) 293 -- will be issued if a restriction (warning) was previous set for this 294 -- entity name using Set_No_Use_Of_Entity. 295 296 procedure Check_Restriction_No_Use_Of_Pragma (N : Node_Id); 297 -- N is the node of a pragma. An error message (warning) will be issued 298 -- if a restriction (warning) was previously set for this pragma using 299 -- Set_No_Use_Of_Pragma. 300 301 procedure Check_Elaboration_Code_Allowed (N : Node_Id); 302 -- Tests to see if elaboration code is allowed by the current restrictions 303 -- settings. This function is called by Gigi when it needs to define an 304 -- elaboration routine. If elaboration code is not allowed, an error 305 -- message is posted on the node given as argument. 306 307 procedure Check_SPARK_05_Restriction 308 (Msg : String; 309 N : Node_Id; 310 Force : Boolean := False); 311 -- Node N represents a construct not allowed in SPARK_05 mode. If this is 312 -- a source node, or if the restriction is forced (Force = True), and 313 -- the SPARK_05 restriction is set, then an error is issued on N. Msg 314 -- is appended to the restriction failure message. 315 316 procedure Check_SPARK_05_Restriction (Msg1, Msg2 : String; N : Node_Id); 317 -- Same as Check_SPARK_05_Restriction except there is a continuation 318 -- message Msg2 following the initial message Msg1. 319 320 procedure Check_No_Implicit_Aliasing (Obj : Node_Id); 321 -- Obj is a node for which Is_Aliased_View is True, which is being used in 322 -- a context (e.g. 'Access) where no implicit aliasing is allowed if the 323 -- restriction No_Implicit_Aliasing is set. This procedure checks for the 324 -- case where the restriction is active and Obj does not meet the required 325 -- rules for avoiding implicit aliases, and issues a restriction message. 326 327 procedure Check_Implicit_Dynamic_Code_Allowed (N : Node_Id); 328 -- Tests to see if dynamic code generation (dynamically generated 329 -- trampolines, in particular) is allowed by the current restrictions 330 -- settings. This function is called by Gigi when it needs to generate code 331 -- that generates a trampoline. If not allowed, an error message is posted 332 -- on the node given as argument. 333 334 procedure Check_No_Implicit_Heap_Alloc (N : Node_Id); 335 -- Equivalent to Check_Restriction (No_Implicit_Heap_Allocations, N). 336 -- Provided for easy use by back end, which has to check this restriction. 337 338 procedure Check_Obsolescent_2005_Entity (E : Entity_Id; N : Node_Id); 339 -- This routine checks if the entity E is one of the obsolescent entries 340 -- in Ada.Characters.Handling in Ada 2005 and No_Obsolescent_Features 341 -- restriction is active. If so an appropriate message is given. N is 342 -- the node on which the message is to be placed. It's a bit kludgy to 343 -- have this highly specialized routine rather than some wonderful general 344 -- mechanism (e.g. a special pragma) to handle this case, but there are 345 -- only six cases, and it is not worth the effort to do something general. 346 347 procedure Check_Wide_Character_Restriction (E : Entity_Id; N : Node_Id); 348 -- This procedure checks if the No_Wide_Character restriction is active, 349 -- and if so, if N Comes_From_Source, and the root type of E is one of 350 -- [Wide_]Wide_Character or [Wide_]Wide_String, then the restriction 351 -- violation is recorded, and an appropriate message given. 352 353 function Get_Restriction_Id 354 (N : Name_Id) return Restriction_Id; 355 -- Given an identifier name, determines if it is a valid restriction 356 -- identifier, and if so returns the corresponding Restriction_Id value, 357 -- otherwise returns Not_A_Restriction_Id. 358 359 function OK_No_Dependence_Unit_Name (N : Node_Id) return Boolean; 360 -- Used in checking No_Dependence argument of pragma Restrictions or 361 -- pragma Restrictions_Warning, or attribute Restriction_Set. Returns 362 -- True if N has the proper form for a unit name, False otherwise. 363 364 function OK_No_Use_Of_Entity_Name (N : Node_Id) return Boolean; 365 -- Used in checking No_Use_Of_Entity argument of pragma Restrictions or 366 -- pragma Restrictions_Warning, or attribute Restriction_Set. Returns 367 -- True if N has the proper form for an entity name, False otherwise. 368 369 function Is_In_Hidden_Part_In_SPARK (Loc : Source_Ptr) return Boolean; 370 -- Determine if given location is covered by a hidden region range in the 371 -- SPARK hides table. 372 373 function No_Exception_Handlers_Set return Boolean; 374 -- Test to see if current restrictions settings specify that no exception 375 -- handlers are present. This function is called by Gigi when it needs to 376 -- expand an AT END clean up identifier with no exception handler. True 377 -- will be returned if the configurable run-time is activated, and either 378 -- of the restrictions No_Exception_Handlers or No_Exception_Propagation is 379 -- set. In the latter case, the source may contain handlers but they either 380 -- get converted using the local goto transformation or deleted. 381 382 function No_Exception_Propagation_Active return Boolean; 383 -- Test to see if current restrictions settings specify that no 384 -- exception propagation is activated. 385 386 function Process_Restriction_Synonyms (N : Node_Id) return Name_Id; 387 -- Id is a node whose Chars field contains the name of a restriction. 388 -- If it is one of synonyms that we allow for historical purposes (for 389 -- list see System.Rident), then the proper official name is returned. 390 391 function Restriction_Active (R : All_Restrictions) return Boolean; 392 pragma Inline (Restriction_Active); 393 -- Determines if a given restriction is active. This call should only be 394 -- used where the compiled code depends on whether the restriction is 395 -- active. Always use Check_Restriction to record a violation. Note that 396 -- this returns False if we only have a Restriction_Warnings set, since 397 -- restriction warnings should never affect generated code. If you want 398 -- to know if a call to Check_Restriction is needed then use the function 399 -- Restriction_Check_Required instead. 400 401 function Restriction_Check_Required (R : All_Restrictions) return Boolean; 402 pragma Inline (Restriction_Check_Required); 403 -- Determines if either a Restriction_Warnings or Restrictions pragma has 404 -- been given for the specified restriction. If true, then a subsequent 405 -- call to Check_Restriction is required if the restriction is violated. 406 -- This must not be used to guard code generation that depends on whether 407 -- a restriction is active (see Restriction_Active above). Typically it 408 -- is used to avoid complex code to determine if a restriction is violated, 409 -- executing this code only if needed. 410 411 function Restricted_Profile return Boolean; 412 -- Tests if set of restrictions corresponding to Profile (Restricted) is 413 -- currently in effect (set by pragma Profile, or by an appropriate set of 414 -- individual Restrictions pragmas). Returns True only if all the required 415 -- restrictions are set. 416 417 procedure Set_Hidden_Part_In_SPARK (Loc1, Loc2 : Source_Ptr); 418 -- Insert a new hidden region range in the SPARK hides table. The effect 419 -- is to hide any SPARK violation messages which are in the range Loc1 to 420 -- Loc2-1 (i.e. Loc2 is the first location for reenabling checks). 421 422 procedure Set_Profile_Restrictions 423 (P : Profile_Name; 424 N : Node_Id; 425 Warn : Boolean); 426 -- Sets the set of restrictions associated with the given profile name. N 427 -- is the node of the construct to which error messages are to be attached 428 -- as required. Warn is set True for the case of Profile_Warnings where the 429 -- restrictions are set as warnings rather than legality requirements, and 430 -- is also True for Profile if the Treat_Restrictions_As_Warnings flag is 431 -- set. It is false for Profile if this flag is not set. 432 433 procedure Set_Restriction 434 (R : All_Boolean_Restrictions; 435 N : Node_Id); 436 -- N is a node (typically a pragma node) that has the effect of setting 437 -- Boolean restriction R. The restriction is set in Restrictions, and 438 -- also in Main_Restrictions if this is the main unit. 439 440 procedure Set_Restriction 441 (R : All_Parameter_Restrictions; 442 N : Node_Id; 443 V : Integer); 444 -- Similar to the above, except that this is used for the case of a 445 -- parameter restriction, and the corresponding value V is given. 446 447 procedure Set_Restriction_No_Dependence 448 (Unit : Node_Id; 449 Warn : Boolean; 450 Profile : Profile_Name := No_Profile); 451 -- Sets given No_Dependence restriction in table if not there already. Warn 452 -- is True if from Restriction_Warnings, or for Restrictions if the flag 453 -- Treat_Restrictions_As_Warnings is set. False if from Restrictions and 454 -- this flag is not set. Profile is set to a non-default value if the 455 -- No_Dependence restriction comes from a Profile pragma. 456 457 procedure Set_Restriction_No_Specification_Of_Aspect 458 (N : Node_Id; 459 Warning : Boolean); 460 -- N is the node id for an identifier from a pragma Restrictions for the 461 -- No_Specification_Of_Aspect pragma. An error message will be issued if 462 -- the identifier is not a valid aspect name. Warning is set True for the 463 -- case of a Restriction_Warnings pragma specifying this restriction and 464 -- False for a Restrictions pragma specifying this restriction. 465 466 procedure Set_Restriction_No_Use_Of_Attribute 467 (N : Node_Id; 468 Warning : Boolean); 469 -- N is the node id for the identifier in a pragma Restrictions for 470 -- No_Use_Of_Attribute. Caller has verified that this is a valid attribute 471 -- designator. 472 473 procedure Set_Restriction_No_Use_Of_Entity 474 (Entity : Node_Id; 475 Warn : Boolean; 476 Profile : Profile_Name := No_Profile); 477 -- Sets given No_Use_Of_Entity restriction in table if not there already. 478 -- Warn is True if from Restriction_Warnings, or for Restrictions if the 479 -- flag Treat_Restrictions_As_Warnings is set. False if from Restrictions 480 -- and this flag is not set. Profile is set to a non-default value if the 481 -- No_Dependence restriction comes from a Profile pragma. This procedure 482 -- also takes care of setting the Boolean2 flag of the simple name for 483 -- the entity (to optimize table searches). 484 485 procedure Set_Restriction_No_Use_Of_Pragma 486 (N : Node_Id; 487 Warning : Boolean); 488 -- N is the node id for the identifier in a pragma Restrictions for 489 -- No_Use_Of_Pragma. Caller has verified that this is a valid pragma id. 490 491 function Tasking_Allowed return Boolean; 492 pragma Inline (Tasking_Allowed); 493 -- Tests if tasking operations are allowed by the current restrictions 494 -- settings. For tasking to be allowed Max_Tasks must be non-zero. 495 496 ---------------------------------------------- 497 -- Handling of Boolean Compilation Switches -- 498 ---------------------------------------------- 499 500 -- The following declarations are used for proper saving and restoring of 501 -- restrictions for separate compilation units. There are two cases: 502 503 -- For partition-wide restrictions, we just let the restrictions pragmas 504 -- pile up, and we never reset them. We might as well detect what we can 505 -- at compile time. If e.g. a with'ed unit has a restriction for one of 506 -- the partition-wide restrictions, then the binder will enforce it on 507 -- all units in the partition, including the unit with the WITH. Although 508 -- it would not be wrong to leave this till bind time, we might as well 509 -- flag it earlier at compile time. 510 511 -- For non-partition-wide restrictions, we have quite a different state 512 -- of affairs. Here it would be quite wrong to carry a restriction from 513 -- a with'ed unit to another with'ed unit, or from a package spec to the 514 -- package body. This means that we have to reset these non-partition 515 -- wide restrictions at the start of each separate compilation unit. For 516 -- units in the extended main program, we need to reset them all to the 517 -- values set by the configuration pragma file(s). For units not in the 518 -- extended main program, e.g. with'ed units, we might as well reset all 519 -- of these restrictions to off (False). The actual initial values will 520 -- be taken from the config files active when those units are compiled 521 -- as main units. 522 523 type Save_Cunit_Boolean_Restrictions is private; 524 -- Type used for saving and restoring compilation unit restrictions. 525 526 function Cunit_Boolean_Restrictions_Save 527 return Save_Cunit_Boolean_Restrictions; 528 -- This function saves the compilation unit restriction settings, leaving 529 -- then unchanged. This is used e.g. at the start of processing a context 530 -- clause, so that the main unit restrictions can be restored after all 531 -- the with'ed units have been processed. 532 533 procedure Cunit_Boolean_Restrictions_Restore 534 (R : Save_Cunit_Boolean_Restrictions); 535 -- This is the corresponding restore procedure to restore restrictions 536 -- previously saved by Cunit_Boolean_Restrictions_Save. However it does 537 -- not reset No_Elaboration_Code, this stays set if it was set before 538 -- the call, and also if it is set before the call, then the Config 539 -- setting is also updated to include this restriction. This is what 540 -- implements the special handling of No_Elaboration_Code. 541 542 procedure Save_Config_Cunit_Boolean_Restrictions; 543 -- This saves the current compilation unit restrictions in an internal 544 -- variable, and leaves them unchanged. This is called immediately after 545 -- processing the configuration file pragmas, to record the restrictions 546 -- set by these configuration file pragmas. 547 548 procedure Restore_Config_Cunit_Boolean_Restrictions; 549 -- This restores the value saved by the previous call to save config values 550 -- saved by Save_Config_Cunit_Boolean_Restrictions. It is called at the 551 -- start of processing a new unit that is part of the main sources (e.g. 552 -- a package spec when the main unit is a package body). 553 554 procedure Reset_Cunit_Boolean_Restrictions; 555 -- Turns off all non-partition-wide boolean restrictions 556 557 procedure Add_To_Config_Boolean_Restrictions (R : Restriction_Id); 558 -- Add specified restriction to stored configuration boolean restrictions. 559 -- This is used for handling the special case of No_Elaboration_Code. 560 561private 562 type Save_Cunit_Boolean_Restrictions is 563 array (Cunit_Boolean_Restrictions) of Boolean; 564 -- Type used for saving and restoring compilation unit restrictions. 565 -- See Compilation_Unit_Restrictions_[Save|Restore] subprograms. 566 567end Restrict; 568