gcc/ada/libgnat/s-rident.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                         S Y S T E M . R I D E N T                        --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                                                                          --
   9 --          Copyright (C) 1992-2018, 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.                                     --
  17 --                                                                          --
  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.               --
  21 --                                                                          --
  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/>.                                          --
  26 --                                                                          --
  27 -- GNAT was originally developed  by the GNAT team at  New York University. --
  28 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  29 --                                                                          --
  30 ------------------------------------------------------------------------------
  31
  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.
  35
  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
  42 --  the tables.
  43
  44 ---------------------------------------------------
  45 -- Note On Compile/Run-Time Consistency Checking --
  46 ---------------------------------------------------
  47
  48 --  This unit is with'ed by the run-time (to make System.Restrictions which is
  49 --  used for run-time access to restriction information), by the compiler (to
  50 --  determine what restrictions are implemented and what their category is) and
  51 --  by the binder (in processing ali files, and generating the information used
  52 --  at run-time to access restriction information).
  53
  54 --  Normally the version of System.Rident referenced in all three contexts
  55 --  should be the same. However, problems could arise in certain inconsistent
  56 --  builds that used inconsistent versions of the compiler and run-time. This
  57 --  sort of thing is not strictly correct, but it does arise when short-cuts
  58 --  are taken in build procedures.
  59
  60 --  Previously, this kind of inconsistency could cause a significant problem.
  61 --  If versions of System.Rident accessed by the compiler and binder differed,
  62 --  then the binder could fail to recognize the R (restrictions line) in the
  63 --  ali file, leading to bind errors when restrictions were added or removed.
  64
  65 --  The latest implementation avoids both this problem by using a named
  66 --  scheme for recording restrictions, rather than a positional scheme which
  67 --  fails completely if restrictions are added or subtracted. Now the worst
  68 --  that happens at bind time in inconsistent builds is that unrecognized
  69 --  restrictions are ignored, and the consistency checking for restrictions
  70 --  might be incomplete, which is no big deal.
  71
  72 pragma Compiler_Unit_Warning;
  73
  74 generic
  75 package System.Rident is
  76    pragma Preelaborate;
  77
  78    --  The following enumeration type defines the set of restriction
  79    --  identifiers that are implemented in GNAT.
  80
  81    --  To add a new restriction identifier, add an entry with the name to be
  82    --  used in the pragma, and add calls to the Restrict.Check_Restriction
  83    --  routine as appropriate.
  84
  85    type Restriction_Id is
  86
  87       --  The following cases are checked for consistency in the binder. The
  88       --  binder will check that every unit either has the restriction set, or
  89       --  does not violate the restriction.
  90
  91      (Simple_Barriers,                           -- Ada 2012 (D.7 (10.9/3))
  92       Pure_Barriers,                             -- GNAT
  93       No_Abort_Statements,                       -- (RM D.7(5), H.4(3))
  94       No_Access_Parameter_Allocators,            -- Ada 2012 (RM H.4 (8.3/3))
  95       No_Access_Subprograms,                     -- (RM H.4(17))
  96       No_Allocators,                             -- (RM H.4(7))
  97       No_Anonymous_Allocators,                   -- Ada 2012 (RM H.4(8/1))
  98       No_Asynchronous_Control,                   -- (RM J.13(3/2)
  99       No_Calendar,                               -- GNAT
 100       No_Coextensions,                           -- Ada 2012 (RM H.4(8.2/3))
 101       No_Default_Stream_Attributes,              -- Ada 2012 (RM 13.12.1(4/2))
 102       No_Delay,                                  -- (RM H.4(21))
 103       No_Direct_Boolean_Operators,               -- GNAT
 104       No_Dispatch,                               -- (RM H.4(19))
 105       No_Dispatching_Calls,                      -- GNAT
 106       No_Dynamic_Attachment,                     -- Ada 2012 (RM E.7(10/3))
 107       No_Dynamic_Priorities,                     -- (RM D.9(9))
 108       No_Enumeration_Maps,                       -- GNAT
 109       No_Entry_Calls_In_Elaboration_Code,        -- GNAT
 110       No_Entry_Queue,                            -- GNAT (Ravenscar)
 111       No_Exception_Handlers,                     -- GNAT
 112       No_Exception_Propagation,                  -- GNAT
 113       No_Exception_Registration,                 -- GNAT
 114       No_Exceptions,                             -- (RM H.4(12))
 115       No_Finalization,                           -- GNAT
 116       No_Fixed_IO,                               -- GNAT
 117       No_Fixed_Point,                            -- (RM H.4(15))
 118       No_Floating_Point,                         -- (RM H.4(14))
 119       No_IO,                                     -- (RM H.4(20))
 120       No_Implicit_Conditionals,                  -- GNAT
 121       No_Implicit_Dynamic_Code,                  -- GNAT
 122       No_Implicit_Heap_Allocations,              -- (RM D.8(8), H.4(3))
 123       No_Implicit_Task_Allocations,              -- GNAT
 124       No_Implicit_Protected_Object_Allocations,  -- GNAT
 125       No_Initialize_Scalars,                     -- GNAT
 126       No_Local_Allocators,                       -- (RM H.4(8))
 127       No_Local_Timing_Events,                    -- (RM D.7(10.2/2))
 128       No_Local_Protected_Objects,                -- Ada 2012 (D.7(10/1.3))
 129       No_Long_Long_Integers,                     -- GNAT
 130       No_Multiple_Elaboration,                   -- GNAT
 131       No_Nested_Finalization,                    -- (RM D.7(4))
 132       No_Protected_Type_Allocators,              -- Ada 2012 (D.7 (10.3/2))
 133       No_Protected_Types,                        -- (RM H.4(5))
 134       No_Recursion,                              -- (RM H.4(22))
 135       No_Reentrancy,                             -- (RM H.4(23))
 136       No_Relative_Delay,                         -- Ada 2012 (D.7 (10.5/3))
 137       No_Requeue_Statements,                     -- Ada 2012 (D.7 (10.6/3))
 138       No_Secondary_Stack,                        -- GNAT
 139       No_Select_Statements,                      -- Ada 2012 (D.7 (10.7/4))
 140       No_Specific_Termination_Handlers,          -- (RM D.7(10.7/2))
 141       No_Standard_Allocators_After_Elaboration,  -- Ada 2012 (RM D.7(19.1/2))
 142       No_Standard_Storage_Pools,                 -- GNAT
 143       No_Stream_Optimizations,                   -- GNAT
 144       No_Streams,                                -- GNAT
 145       No_Task_Allocators,                        -- (RM D.7(7))
 146       No_Task_Attributes_Package,                -- GNAT
 147       No_Task_At_Interrupt_Priority,             -- GNAT
 148       No_Task_Hierarchy,                         -- (RM D.7(3), H.4(3))
 149       No_Task_Termination,                       -- GNAT (Ravenscar)
 150       No_Tasking,                                -- GNAT
 151       No_Terminate_Alternatives,                 -- (RM D.7(6))
 152       No_Unchecked_Access,                       -- (RM H.4(18))
 153       No_Unchecked_Conversion,                   -- (RM J.13(4/2))
 154       No_Unchecked_Deallocation,                 -- (RM J.13(5/2))
 155       Static_Priorities,                         -- GNAT
 156       Static_Storage_Size,                       -- GNAT
 157
 158       --  The following require consistency checking with special rules. See
 159       --  individual routines in unit Bcheck for details of what is required.
 160
 161       No_Default_Initialization,                 -- GNAT
 162
 163       --  The following cases do not require consistency checking and if used
 164       --  as a configuration pragma within a specific unit, apply only to that
 165       --  unit (e.g. if used in the package spec, do not apply to the body)
 166
 167       --  Note: No_Elaboration_Code is handled specially. Like the other
 168       --  non-partition-wide restrictions, it can only be set in a unit that
 169       --  is part of the extended main source unit (body/spec/subunits). But
 170       --  it is sticky, in that if it is found anywhere within any of these
 171       --  units, it applies to all units in this extended main source.
 172
 173       Immediate_Reclamation,                     -- (RM H.4(10))
 174       No_Dynamic_Sized_Objects,                  -- GNAT
 175       No_Implementation_Aspect_Specifications,   -- Ada 2012 AI-241
 176       No_Implementation_Attributes,              -- Ada 2005 AI-257
 177       No_Implementation_Identifiers,             -- Ada 2012 AI-246
 178       No_Implementation_Pragmas,                 -- Ada 2005 AI-257
 179       No_Implementation_Restrictions,            -- GNAT
 180       No_Implementation_Units,                   -- Ada 2012 AI-242
 181       No_Implicit_Aliasing,                      -- GNAT
 182       No_Implicit_Loops,                         -- GNAT
 183       No_Elaboration_Code,                       -- GNAT
 184       No_Obsolescent_Features,                   -- Ada 2005 AI-368
 185       No_Wide_Characters,                        -- GNAT
 186       Static_Dispatch_Tables,                    -- GNAT
 187       SPARK_05,                                  -- GNAT
 188
 189       --  The following cases require a parameter value
 190
 191       No_Specification_Of_Aspect,                -- 2012 (RM 13.12.1 (6.1/3))
 192       No_Use_Of_Attribute,                       -- 2012 (RM 13.12.1 (6.2/3))
 193       No_Use_Of_Pragma,                          -- 2012 (RM 13.12.1 (6.3/3))
 194
 195       --  The following entries are fully checked at compile/bind time, which
 196       --  means that the compiler can in general tell the minimum value which
 197       --  could be used with a restrictions pragma. The binder can deduce the
 198       --  appropriate minimum value for the partition by taking the maximum
 199       --  value required by any unit.
 200
 201       Max_Protected_Entries,                     -- (RM D.7(14))
 202       Max_Select_Alternatives,                   -- (RM D.7(12))
 203       Max_Task_Entries,                          -- (RM D.7(13), H.4(3))
 204
 205       --  The following entries are also fully checked at compile/bind time,
 206       --  and the compiler can also at least in some cases tell the minimum
 207       --  value which could be used with a restriction pragma. The difference
 208       --  is that the contributions are additive, so the binder deduces this
 209       --  value by adding the unit contributions.
 210
 211       Max_Tasks,                                 -- (RM D.7(19), H.4(3))
 212
 213       --  The following entries are checked at compile time only for zero/
 214       --  nonzero entries. This means that the compiler can tell at compile
 215       --  time if a restriction value of zero is (would be) violated, but that
 216       --  the compiler cannot distinguish between different non-zero values.
 217
 218       Max_Asynchronous_Select_Nesting,           -- (RM D.7(18), H.4(3))
 219       Max_Entry_Queue_Length,                    -- Ada 2012 (RM D.7 (19.1/2))
 220
 221       --  The remaining entries are not checked at compile/bind time
 222
 223       Max_Storage_At_Blocking,                   -- (RM D.7(17))
 224
 225       Not_A_Restriction_Id);
 226
 227    --  Synonyms permitted for historical purposes of compatibility.
 228    --  Must be coordinated with Restrict.Process_Restriction_Synonym.
 229
 230    Boolean_Entry_Barriers : Restriction_Id renames Simple_Barriers;
 231    Max_Entry_Queue_Depth  : Restriction_Id renames Max_Entry_Queue_Length;
 232    No_Dynamic_Interrupts  : Restriction_Id renames No_Dynamic_Attachment;
 233    No_Requeue             : Restriction_Id renames No_Requeue_Statements;
 234    No_Task_Attributes     : Restriction_Id renames No_Task_Attributes_Package;
 235    SPARK                  : Restriction_Id renames SPARK_05;
 236
 237    subtype All_Restrictions is Restriction_Id range
 238      Simple_Barriers .. Max_Storage_At_Blocking;
 239    --  All restrictions (excluding only Not_A_Restriction_Id)
 240
 241    subtype All_Boolean_Restrictions is Restriction_Id range
 242      Simple_Barriers .. SPARK_05;
 243    --  All restrictions which do not take a parameter
 244
 245    subtype Partition_Boolean_Restrictions is All_Boolean_Restrictions range
 246      Simple_Barriers .. Static_Storage_Size;
 247    --  Boolean restrictions that are checked for partition consistency.
 248    --  Note that all parameter restrictions are checked for partition
 249    --  consistency by default, so this distinction is only needed in the
 250    --  case of Boolean restrictions.
 251
 252    subtype Cunit_Boolean_Restrictions is All_Boolean_Restrictions range
 253      Immediate_Reclamation .. SPARK_05;
 254    --  Boolean restrictions that are not checked for partition consistency
 255    --  and that thus apply only to the current unit. Note that for these
 256    --  restrictions, the compiler does not apply restrictions found in
 257    --  with'ed units, parent specs etc. to the main unit, and vice versa.
 258
 259    subtype All_Parameter_Restrictions is
 260      Restriction_Id range
 261        No_Specification_Of_Aspect .. Max_Storage_At_Blocking;
 262    --  All restrictions that take a parameter
 263
 264    subtype Integer_Parameter_Restrictions is
 265      Restriction_Id range
 266        Max_Protected_Entries .. Max_Storage_At_Blocking;
 267    --  All restrictions taking an integer parameter
 268
 269    subtype Checked_Parameter_Restrictions is
 270      All_Parameter_Restrictions range
 271        Max_Protected_Entries .. Max_Entry_Queue_Length;
 272    --  These are the parameter restrictions that can be at least partially
 273    --  checked at compile/binder time. Minimally, the compiler can detect
 274    --  violations of a restriction pragma with a value of zero reliably.
 275
 276    subtype Checked_Max_Parameter_Restrictions is
 277      Checked_Parameter_Restrictions range
 278        Max_Protected_Entries .. Max_Task_Entries;
 279    --  Restrictions with parameters that can be checked in some cases by
 280    --  maximizing among statically detected instances where the compiler
 281    --  can determine the count.
 282
 283    subtype Checked_Add_Parameter_Restrictions is
 284      Checked_Parameter_Restrictions range
 285        Max_Tasks .. Max_Tasks;
 286    --  Restrictions with parameters that can be checked in some cases by
 287    --  summing the statically detected instances where the compiler can
 288    --  determine the count.
 289
 290    subtype Checked_Val_Parameter_Restrictions is
 291      Checked_Parameter_Restrictions range
 292        Max_Protected_Entries .. Max_Tasks;
 293    --  Restrictions with parameter where the count is known at least in some
 294    --  cases by the compiler/binder.
 295
 296    subtype Checked_Zero_Parameter_Restrictions is
 297      Checked_Parameter_Restrictions range
 298        Max_Asynchronous_Select_Nesting .. Max_Entry_Queue_Length;
 299    --  Restrictions with parameters where the compiler can detect the use of
 300    --  the feature, and hence violations of a restriction specifying a value
 301    --  of zero, but cannot detect specific values other than zero/nonzero.
 302
 303    subtype Unchecked_Parameter_Restrictions is
 304      All_Parameter_Restrictions range
 305        Max_Storage_At_Blocking .. Max_Storage_At_Blocking;
 306    --  Restrictions with parameters where the compiler cannot ever detect
 307    --  corresponding compile time usage, so the binder and compiler never
 308    --  detect violations of any restriction.
 309
 310    -------------------------------------
 311    -- Restriction Status Declarations --
 312    -------------------------------------
 313
 314    --  The following declarations are used to record the current status or
 315    --  restrictions (for the current unit, or related units, at compile time,
 316    --  and for all units in a partition at bind time or run time).
 317
 318    type Restriction_Flags  is array (All_Restrictions)           of Boolean;
 319    type Restriction_Values is array (All_Parameter_Restrictions) of Natural;
 320    type Parameter_Flags    is array (All_Parameter_Restrictions) of Boolean;
 321
 322    type Restrictions_Info is record
 323       Set : Restriction_Flags;
 324       --  An entry is True in the Set array if a restrictions pragma has been
 325       --  encountered for the given restriction. If the value is True for a
 326       --  parameter restriction, then the corresponding entry in the Value
 327       --  array gives the minimum value encountered for any such restriction.
 328
 329       Value : Restriction_Values;
 330       --  If the entry for a parameter restriction in Set is True (i.e. a
 331       --  restrictions pragma for the restriction has been encountered), then
 332       --  the corresponding entry in the Value array is the minimum value
 333       --  specified by any such restrictions pragma. Note that a restrictions
 334       --  pragma specifying a value greater than Int'Last is simply ignored.
 335
 336       Violated : Restriction_Flags;
 337       --  An entry is True in the violations array if the compiler has detected
 338       --  a violation of the restriction. For a parameter restriction, the
 339       --  Count and Unknown arrays have additional information.
 340
 341       Count : Restriction_Values;
 342       --  If an entry for a parameter restriction is True in Violated, the
 343       --  corresponding entry in the Count array may record additional
 344       --  information. If the actual minimum count is known (by taking
 345       --  maximums, or sums, depending on the restriction), it will be
 346       --  recorded in this array. If not, then the value will remain zero.
 347       --  The value is also zero for a non-violated restriction.
 348
 349       Unknown : Parameter_Flags;
 350       --  If an entry for a parameter restriction is True in Violated, the
 351       --  corresponding entry in the Unknown array may record additional
 352       --  information. If the actual count is not known by the compiler (but
 353       --  is known to be non-zero), then the entry in Unknown will be True.
 354       --  This indicates that the value in Count is not known to be exact,
 355       --  and the actual violation count may be higher.
 356
 357       --  Note: If Violated (K) is True, then either Count (K) > 0 or
 358       --  Unknown (K) = True. It is possible for both these to be set.
 359       --  For example, if Count (K) = 3 and Unknown (K) is True, it means
 360       --  that the actual violation count is at least 3 but might be higher.
 361    end record;
 362
 363    No_Restrictions : constant Restrictions_Info :=
 364      (Set      => (others => False),
 365       Value    => (others => 0),
 366       Violated => (others => False),
 367       Count    => (others => 0),
 368       Unknown  => (others => False));
 369    --  Used to initialize Restrictions_Info variables
 370
 371    ----------------------------------
 372    -- Profile Definitions and Data --
 373    ----------------------------------
 374
 375    --  Note: to add a profile, modify the following declarations appropriately,
 376    --  add Name_xxx to Snames, and add a branch to the conditions for pragmas
 377    --  Profile and Profile_Warnings in the body of Sem_Prag.
 378
 379    type Profile_Name is
 380      (No_Profile,
 381       No_Implementation_Extensions,
 382       Restricted_Tasking,
 383       Restricted,
 384       Ravenscar,
 385       GNAT_Extended_Ravenscar,
 386       GNAT_Ravenscar_EDF);
 387    --  Names of recognized profiles. No_Profile is used to indicate that a
 388    --  restriction came from pragma Restrictions[_Warning], as opposed to
 389    --  pragma Profile[_Warning]. Restricted_Tasking is a non-user profile that
 390    --  contaings the minimal set of restrictions to trigger the user of the
 391    --  restricted tasking runtime. Restricted is the corresponding user profile
 392    --  that also restrict protected types.
 393
 394    subtype Profile_Name_Actual is Profile_Name
 395      range No_Implementation_Extensions .. Profile_Name'Last;
 396    --  Actual used profile names
 397
 398    type Profile_Data is record
 399       Set : Restriction_Flags;
 400       --  Set to True if given restriction must be set for the profile, and
 401       --  False if it need not be set (False does not mean that it must not be
 402       --  set, just that it need not be set). If the flag is True for a
 403       --  parameter restriction, then the Value array gives the maximum value
 404       --  permitted by the profile.
 405
 406       Value : Restriction_Values;
 407       --  An entry in this array is meaningful only if the corresponding flag
 408       --  in Set is True. In that case, the value in this array is the maximum
 409       --  value of the parameter permitted by the profile.
 410    end record;
 411
 412    Profile_Info : constant array (Profile_Name_Actual) of Profile_Data := (
 413
 414                      --  No_Implementation_Extensions profile
 415
 416                      No_Implementation_Extensions =>
 417
 418                        (Set   =>
 419                           (No_Implementation_Aspect_Specifications => True,
 420                            No_Implementation_Attributes            => True,
 421                            No_Implementation_Identifiers           => True,
 422                            No_Implementation_Pragmas               => True,
 423                            No_Implementation_Units                 => True,
 424                            others                                  => False),
 425
 426                         --  Value settings for Restricted profile (none
 427
 428                         Value =>
 429                           (others                          => 0)),
 430
 431                      --  Restricted_Tasking Profile
 432
 433                      Restricted_Tasking =>
 434
 435                         --  Restrictions for Restricted_Tasking profile
 436
 437                        (Set   =>
 438                           (No_Abort_Statements             => True,
 439                            No_Asynchronous_Control         => True,
 440                            No_Dynamic_Attachment           => True,
 441                            No_Dynamic_Priorities           => True,
 442                            No_Local_Protected_Objects      => True,
 443                            No_Protected_Type_Allocators    => True,
 444                            No_Requeue_Statements           => True,
 445                            No_Task_Allocators              => True,
 446                            No_Task_Attributes_Package      => True,
 447                            No_Task_Hierarchy               => True,
 448                            No_Terminate_Alternatives       => True,
 449                            Max_Asynchronous_Select_Nesting => True,
 450                            Max_Select_Alternatives         => True,
 451                            Max_Task_Entries                => True,
 452                            others                          => False),
 453
 454                         --  Value settings for Restricted_Tasking profile
 455
 456                         Value =>
 457                           (Max_Asynchronous_Select_Nesting => 0,
 458                            Max_Select_Alternatives         => 0,
 459                            Max_Task_Entries                => 0,
 460                            others                          => 0)),
 461
 462                      --  Restricted Profile
 463
 464                      Restricted =>
 465
 466                         --  Restrictions for Restricted profile
 467
 468                        (Set   =>
 469                           (No_Abort_Statements             => True,
 470                            No_Asynchronous_Control         => True,
 471                            No_Dynamic_Attachment           => True,
 472                            No_Dynamic_Priorities           => True,
 473                            No_Entry_Queue                  => True,
 474                            No_Local_Protected_Objects      => True,
 475                            No_Protected_Type_Allocators    => True,
 476                            No_Requeue_Statements           => True,
 477                            No_Task_Allocators              => True,
 478                            No_Task_Attributes_Package      => True,
 479                            No_Task_Hierarchy               => True,
 480                            No_Terminate_Alternatives       => True,
 481                            Max_Asynchronous_Select_Nesting => True,
 482                            Max_Protected_Entries           => True,
 483                            Max_Select_Alternatives         => True,
 484                            Max_Task_Entries                => True,
 485                            others                          => False),
 486
 487                         --  Value settings for Restricted profile
 488
 489                         Value =>
 490                           (Max_Asynchronous_Select_Nesting => 0,
 491                            Max_Protected_Entries           => 1,
 492                            Max_Select_Alternatives         => 0,
 493                            Max_Task_Entries                => 0,
 494                            others                          => 0)),
 495
 496                      --  Ravenscar Profile
 497
 498                      --  Note: the table entries here only represent the
 499                      --  required restriction profile for Ravenscar. The
 500                      --  full Ravenscar profile also requires:
 501
 502                      --    pragma Dispatching_Policy (FIFO_Within_Priorities);
 503                      --    pragma Locking_Policy (Ceiling_Locking);
 504                      --    pragma Detect_Blocking;
 505
 506                      Ravenscar  =>
 507
 508                      --  Restrictions for Ravenscar = Restricted profile ..
 509
 510                        (Set   =>
 511                           (No_Abort_Statements             => True,
 512                            No_Asynchronous_Control         => True,
 513                            No_Dynamic_Attachment           => True,
 514                            No_Dynamic_Priorities           => True,
 515                            No_Entry_Queue                  => True,
 516                            No_Local_Protected_Objects      => True,
 517                            No_Protected_Type_Allocators    => True,
 518                            No_Requeue_Statements           => True,
 519                            No_Task_Allocators              => True,
 520                            No_Task_Attributes_Package      => True,
 521                            No_Task_Hierarchy               => True,
 522                            No_Terminate_Alternatives       => True,
 523                            Max_Asynchronous_Select_Nesting => True,
 524                            Max_Protected_Entries           => True,
 525                            Max_Select_Alternatives         => True,
 526                            Max_Task_Entries                => True,
 527
 528                            --  plus these additional restrictions:
 529
 530                            No_Calendar                      => True,
 531                            No_Implicit_Heap_Allocations     => True,
 532                            No_Local_Timing_Events           => True,
 533                            No_Relative_Delay                => True,
 534                            No_Select_Statements             => True,
 535                            No_Specific_Termination_Handlers => True,
 536                            No_Task_Termination              => True,
 537                            Simple_Barriers                  => True,
 538                            others                           => False),
 539
 540                         --  Value settings for Ravenscar (same as Restricted)
 541
 542                         Value =>
 543                           (Max_Asynchronous_Select_Nesting => 0,
 544                            Max_Protected_Entries           => 1,
 545                            Max_Select_Alternatives         => 0,
 546                            Max_Task_Entries                => 0,
 547                            others                          => 0)),
 548
 549                      GNAT_Extended_Ravenscar  =>
 550
 551                      --  Restrictions for GNAT_Extended_Ravenscar =
 552                      --    Restricted profile ..
 553
 554                        (Set   =>
 555                           (No_Abort_Statements             => True,
 556                            No_Asynchronous_Control         => True,
 557                            No_Dynamic_Attachment           => True,
 558                            No_Dynamic_Priorities           => True,
 559                            No_Local_Protected_Objects      => True,
 560                            No_Protected_Type_Allocators    => True,
 561                            No_Requeue_Statements           => True,
 562                            No_Task_Allocators              => True,
 563                            No_Task_Attributes_Package      => True,
 564                            No_Task_Hierarchy               => True,
 565                            No_Terminate_Alternatives       => True,
 566                            Max_Asynchronous_Select_Nesting => True,
 567                            Max_Select_Alternatives         => True,
 568                            Max_Task_Entries                => True,
 569
 570                            --  plus these additional restrictions:
 571
 572                            No_Implicit_Task_Allocations     => True,
 573                            No_Implicit_Protected_Object_Allocations
 574                                                             => True,
 575                            No_Local_Timing_Events           => True,
 576                            No_Select_Statements             => True,
 577                            No_Specific_Termination_Handlers => True,
 578                            No_Task_Termination              => True,
 579                            Pure_Barriers                    => True,
 580                            others                           => False),
 581
 582                         --  Value settings for Ravenscar (same as Restricted)
 583
 584                         Value =>
 585                           (Max_Asynchronous_Select_Nesting => 0,
 586                            Max_Select_Alternatives         => 0,
 587                            Max_Task_Entries                => 0,
 588                            others                          => 0)),
 589
 590                      --  GNAT_Ravenscar_EDF Profile
 591
 592                      --  Note: the table entries here only represent the
 593                      --  required restriction profile for GNAT_Ravenscar_EDF.
 594                      --  The full GNAT_Ravenscar_EDF profile also requires:
 595
 596                      --    pragma Dispatching_Policy (EDF_Across_Priorities);
 597                      --    pragma Locking_Policy (Ceiling_Locking);
 598                      --    pragma Detect_Blocking;
 599
 600                      GNAT_Ravenscar_EDF  =>
 601
 602                      --  Restrictions for Ravenscar = Restricted profile ..
 603
 604                        (Set   =>
 605                           (No_Abort_Statements             => True,
 606                            No_Asynchronous_Control         => True,
 607                            No_Dynamic_Attachment           => True,
 608                            No_Dynamic_Priorities           => True,
 609                            No_Entry_Queue                  => True,
 610                            No_Local_Protected_Objects      => True,
 611                            No_Protected_Type_Allocators    => True,
 612                            No_Requeue_Statements           => True,
 613                            No_Task_Allocators              => True,
 614                            No_Task_Attributes_Package      => True,
 615                            No_Task_Hierarchy               => True,
 616                            No_Terminate_Alternatives       => True,
 617                            Max_Asynchronous_Select_Nesting => True,
 618                            Max_Protected_Entries           => True,
 619                            Max_Select_Alternatives         => True,
 620                            Max_Task_Entries                => True,
 621
 622                            --  plus these additional restrictions:
 623
 624                            No_Calendar                      => True,
 625                            No_Implicit_Heap_Allocations     => True,
 626                            No_Local_Timing_Events           => True,
 627                            No_Relative_Delay                => True,
 628                            No_Select_Statements             => True,
 629                            No_Specific_Termination_Handlers => True,
 630                            No_Task_Termination              => True,
 631                            Simple_Barriers                  => True,
 632                            others                           => False),
 633
 634                         --  Value settings for Ravenscar (same as Restricted)
 635
 636                         Value =>
 637                           (Max_Asynchronous_Select_Nesting => 0,
 638                            Max_Protected_Entries           => 1,
 639                            Max_Select_Alternatives         => 0,
 640                            Max_Task_Entries                => 0,
 641                            others                          => 0)));
 642
 643 end System.Rident;