gcc/ada/aspects.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                              A S P E C T S                               --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                                                                          --
   9 --          Copyright (C) 2010-2023, 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 defines the aspects that are recognized by GNAT in aspect
  27 --  specifications. It also contains the subprograms for storing/retrieving
  28 --  aspect specifications from the tree. The semantic processing for aspect
  29 --  specifications is found in Sem_Ch13.Analyze_Aspect_Specifications.
  30
  31 ------------------------
  32 -- Adding New Aspects --
  33 ------------------------
  34
  35 --  In general, each aspect should have a corresponding pragma or attribute, so
  36 --  that the newly developed functionality is available for old Ada versions.
  37 --  When both are defined, it is convenient to first transform the aspect into
  38 --  an equivalent pragma or attribute in Sem_Ch13.Analyze_Aspect_Specifications
  39 --  and then analyze that.
  40
  41 --  To add a new aspect, you need to do the following
  42
  43 --    1. Create a name in snames.ads-tmpl
  44
  45 --    2. Create a value in type Aspect_Id in this unit
  46
  47 --    3. Add a value for the aspect in the global arrays defined in this unit
  48
  49 --    4. Add code for the aspect in Sem_Ch13.Analyze_Aspect_Specifications.
  50 --       This may involve adding some nodes to the tree to perform additional
  51 --       treatments later.
  52
  53 --    5. If the semantic analysis of expressions/names in the aspect should not
  54 --       occur at the point the aspect is defined, add code in the appropriate
  55 --       semantic analysis procedure for the aspect. For example, this is the
  56 --       case for aspects Pre and Post on subprograms, which are preanalyzed
  57 --       at the end of the declaration list to which the subprogram belongs,
  58 --       and fully analyzed (possibly with expansion) during the semantic
  59 --       analysis of subprogram bodies.
  60
  61 with Namet;   use Namet;
  62 with Snames;  use Snames;
  63 with Types;   use Types;
  64
  65 package Aspects is
  66
  67    --  Type defining recognized aspects
  68
  69    type Aspect_Id is
  70      (No_Aspect,                            -- Dummy entry for no aspect
  71       Aspect_Abstract_State,                -- GNAT
  72       Aspect_Address,
  73       Aspect_Aggregate,
  74       Aspect_Alignment,
  75       Aspect_Always_Terminates,             -- GNAT
  76       Aspect_Annotate,                      -- GNAT
  77       Aspect_Async_Readers,                 -- GNAT
  78       Aspect_Async_Writers,                 -- GNAT
  79       Aspect_Attach_Handler,
  80       Aspect_Bit_Order,
  81       Aspect_Component_Size,
  82       Aspect_Constant_After_Elaboration,    -- GNAT
  83       Aspect_Constant_Indexing,
  84       Aspect_Contract_Cases,                -- GNAT
  85       Aspect_Convention,
  86       Aspect_CPU,
  87       Aspect_Default_Component_Value,
  88       Aspect_Default_Initial_Condition,     -- GNAT
  89       Aspect_Default_Iterator,
  90       Aspect_Default_Storage_Pool,
  91       Aspect_Default_Value,
  92       Aspect_Depends,                       -- GNAT
  93       Aspect_Designated_Storage_Model,      -- GNAT
  94       Aspect_Dimension,                     -- GNAT
  95       Aspect_Dimension_System,              -- GNAT
  96       Aspect_Dispatching_Domain,
  97       Aspect_Dynamic_Predicate,
  98       Aspect_Effective_Reads,               -- GNAT
  99       Aspect_Effective_Writes,              -- GNAT
 100       Aspect_Exceptional_Cases,             -- GNAT
 101       Aspect_Extensions_Visible,            -- GNAT
 102       Aspect_External_Name,
 103       Aspect_External_Tag,
 104       Aspect_Ghost,                         -- GNAT
 105       Aspect_Ghost_Predicate,               -- GNAT
 106       Aspect_Global,                        -- GNAT
 107       Aspect_GNAT_Annotate,                 -- GNAT
 108       Aspect_Implicit_Dereference,
 109       Aspect_Initial_Condition,             -- GNAT
 110       Aspect_Initializes,                   -- GNAT
 111       Aspect_Input,
 112       Aspect_Integer_Literal,
 113       Aspect_Interrupt_Priority,
 114       Aspect_Invariant,                     -- GNAT
 115       Aspect_Iterator_Element,
 116       Aspect_Iterable,                      -- GNAT
 117       Aspect_Link_Name,
 118       Aspect_Linker_Section,                -- GNAT
 119       Aspect_Machine_Radix,
 120       Aspect_Max_Entry_Queue_Depth,         -- GNAT
 121       Aspect_Max_Entry_Queue_Length,
 122       Aspect_Max_Queue_Length,              -- GNAT
 123       Aspect_No_Caching,                    -- GNAT
 124       Aspect_No_Controlled_Parts,
 125       Aspect_No_Task_Parts,                 -- GNAT
 126       Aspect_Object_Size,                   -- GNAT
 127       Aspect_Obsolescent,                   -- GNAT
 128       Aspect_Output,
 129       Aspect_Part_Of,                       -- GNAT
 130       Aspect_Post,
 131       Aspect_Postcondition,
 132       Aspect_Pre,
 133       Aspect_Precondition,
 134       Aspect_Predicate,                     -- GNAT
 135       Aspect_Predicate_Failure,
 136       Aspect_Priority,
 137       Aspect_Put_Image,
 138       Aspect_Read,
 139       Aspect_Real_Literal,
 140       Aspect_Refined_Depends,               -- GNAT
 141       Aspect_Refined_Global,                -- GNAT
 142       Aspect_Refined_Post,                  -- GNAT
 143       Aspect_Refined_State,                 -- GNAT
 144       Aspect_Relative_Deadline,
 145       Aspect_Relaxed_Initialization,        -- GNAT
 146       Aspect_Scalar_Storage_Order,          -- GNAT
 147       Aspect_Secondary_Stack_Size,          -- GNAT
 148       Aspect_Simple_Storage_Pool,           -- GNAT
 149       Aspect_Size,
 150       Aspect_Small,
 151       Aspect_SPARK_Mode,                    -- GNAT
 152       Aspect_Stable_Properties,
 153       Aspect_Static_Predicate,
 154       Aspect_Storage_Model_Type,            -- GNAT
 155       Aspect_Storage_Pool,
 156       Aspect_Storage_Size,
 157       Aspect_Stream_Size,
 158       Aspect_String_Literal,
 159       Aspect_Subprogram_Variant,            -- GNAT
 160       Aspect_Suppress,
 161       Aspect_Synchronization,
 162       Aspect_Test_Case,                     -- GNAT
 163       Aspect_Type_Invariant,
 164       Aspect_Unimplemented,                 -- GNAT
 165       Aspect_Unsuppress,
 166       Aspect_Value_Size,                    -- GNAT
 167       Aspect_Variable_Indexing,
 168       Aspect_Volatile_Function,             -- GNAT
 169       Aspect_Warnings,                      -- GNAT
 170       Aspect_Write,
 171
 172       --  The following aspects correspond to library unit pragmas
 173
 174       Aspect_All_Calls_Remote,
 175       Aspect_Elaborate_Body,
 176       Aspect_No_Elaboration_Code_All,       -- GNAT
 177       Aspect_Preelaborate,
 178       Aspect_Pure,
 179       Aspect_Remote_Call_Interface,
 180       Aspect_Remote_Types,
 181       Aspect_Shared_Passive,
 182
 183       --  Remaining aspects have a static boolean value that turns the aspect
 184       --  on or off. They all correspond to pragmas, but are only converted to
 185       --  the pragmas where the value is True. A value of False normally means
 186       --  that the aspect is ignored, except in the case of derived types where
 187       --  the aspect value is inherited from the parent, in which case, we do
 188       --  not allow False if we inherit a True value from the parent.
 189
 190       Aspect_Asynchronous,
 191       Aspect_Atomic,
 192       Aspect_Atomic_Components,
 193       Aspect_Disable_Controlled,            -- GNAT
 194       Aspect_Discard_Names,
 195       Aspect_CUDA_Device,                   -- GNAT
 196       Aspect_CUDA_Global,                   -- GNAT
 197       Aspect_Exclusive_Functions,
 198       Aspect_Export,
 199       Aspect_Favor_Top_Level,               -- GNAT
 200       Aspect_Full_Access_Only,
 201       Aspect_Independent,
 202       Aspect_Independent_Components,
 203       Aspect_Import,
 204       Aspect_Inline,
 205       Aspect_Inline_Always,                 -- GNAT
 206       Aspect_Interrupt_Handler,
 207       Aspect_Lock_Free,                     -- GNAT
 208       Aspect_No_Inline,                     -- GNAT
 209       Aspect_No_Return,
 210       Aspect_No_Tagged_Streams,             -- GNAT
 211       Aspect_Pack,
 212       Aspect_Persistent_BSS,                -- GNAT
 213       Aspect_Preelaborable_Initialization,
 214       Aspect_Pure_Function,                 -- GNAT
 215       Aspect_Remote_Access_Type,            -- GNAT
 216       Aspect_Shared,                        -- GNAT (equivalent to Atomic)
 217       Aspect_Simple_Storage_Pool_Type,      -- GNAT
 218       Aspect_Static,
 219       Aspect_Suppress_Debug_Info,           -- GNAT
 220       Aspect_Suppress_Initialization,       -- GNAT
 221       Aspect_Thread_Local_Storage,          -- GNAT
 222       Aspect_Unchecked_Union,
 223       Aspect_Universal_Aliasing,            -- GNAT
 224       Aspect_Unmodified,                    -- GNAT
 225       Aspect_Unreferenced,                  -- GNAT
 226       Aspect_Unreferenced_Objects,          -- GNAT
 227       Aspect_Volatile,
 228       Aspect_Volatile_Components,
 229       Aspect_Volatile_Full_Access,          -- GNAT
 230       Aspect_Yield);
 231
 232    subtype Aspect_Id_Exclude_No_Aspect is
 233      Aspect_Id range Aspect_Id'Succ (No_Aspect) .. Aspect_Id'Last;
 234    --  Aspect_Id's excluding No_Aspect
 235
 236    subtype Nonoverridable_Aspect_Id is Aspect_Id with
 237      Static_Predicate => Nonoverridable_Aspect_Id in
 238        Aspect_Default_Iterator | Aspect_Iterator_Element |
 239        Aspect_Implicit_Dereference | Aspect_Constant_Indexing |
 240        Aspect_Variable_Indexing | Aspect_Aggregate |
 241        Aspect_Max_Entry_Queue_Length
 242         | Aspect_No_Controlled_Parts
 243        --  ??? No_Controlled_Parts not yet in Aspect_Id enumeration
 244        ;  --  see RM 13.1.1(18.7)
 245
 246    --  The following array indicates aspects that accept 'Class
 247
 248    Class_Aspect_OK : constant array (Aspect_Id) of Boolean :=
 249      (Aspect_Input             => True,
 250       Aspect_Invariant         => True,
 251       Aspect_Output            => True,
 252       Aspect_Pre               => True,
 253       Aspect_Predicate         => True,
 254       Aspect_Post              => True,
 255       Aspect_Read              => True,
 256       Aspect_Write             => True,
 257       Aspect_Stable_Properties => True,
 258       Aspect_Type_Invariant    => True,
 259       others                   => False);
 260
 261    --  The following array identifies all implementation defined aspects
 262
 263    Implementation_Defined_Aspect : constant array (Aspect_Id) of Boolean :=
 264      (Aspect_Abstract_State             => True,
 265       Aspect_Always_Terminates          => True,
 266       Aspect_Annotate                   => True,
 267       Aspect_Async_Readers              => True,
 268       Aspect_Async_Writers              => True,
 269       Aspect_Constant_After_Elaboration => True,
 270       Aspect_Contract_Cases             => True,
 271       Aspect_Depends                    => True,
 272       Aspect_Dimension                  => True,
 273       Aspect_Dimension_System           => True,
 274       Aspect_Effective_Reads            => True,
 275       Aspect_Effective_Writes           => True,
 276       Aspect_Exceptional_Cases          => True,
 277       Aspect_Extensions_Visible         => True,
 278       Aspect_Favor_Top_Level            => True,
 279       Aspect_Ghost                      => True,
 280       Aspect_Ghost_Predicate            => True,
 281       Aspect_Global                     => True,
 282       Aspect_GNAT_Annotate              => True,
 283       Aspect_Inline_Always              => True,
 284       Aspect_Invariant                  => True,
 285       Aspect_Lock_Free                  => True,
 286       Aspect_Max_Entry_Queue_Depth      => True,
 287       Aspect_Max_Entry_Queue_Length     => True,
 288       Aspect_Max_Queue_Length           => True,
 289       Aspect_Object_Size                => True,
 290       Aspect_Persistent_BSS             => True,
 291       Aspect_Predicate                  => True,
 292       Aspect_Pure_Function              => True,
 293       Aspect_Relaxed_Initialization     => True,
 294       Aspect_Remote_Access_Type         => True,
 295       Aspect_Scalar_Storage_Order       => True,
 296       Aspect_Secondary_Stack_Size       => True,
 297       Aspect_Shared                     => True,
 298       Aspect_Simple_Storage_Pool        => True,
 299       Aspect_Simple_Storage_Pool_Type   => True,
 300       Aspect_Subprogram_Variant         => True,
 301       Aspect_Suppress_Debug_Info        => True,
 302       Aspect_Suppress_Initialization    => True,
 303       Aspect_Thread_Local_Storage       => True,
 304       Aspect_Test_Case                  => True,
 305       Aspect_Universal_Aliasing         => True,
 306       Aspect_Unmodified                 => True,
 307       Aspect_Unreferenced               => True,
 308       Aspect_Unreferenced_Objects       => True,
 309       Aspect_Value_Size                 => True,
 310       Aspect_Volatile_Function          => True,
 311       Aspect_Warnings                   => True,
 312       others                            => False);
 313
 314    --  The following array indicates aspects that specify operational
 315    --  characteristics, and thus are view-specific. Representation
 316    --  aspects break privacy, as they are needed during expansion and
 317    --  code generation.
 318    --  List is currently incomplete ???
 319
 320    Operational_Aspect : constant array (Aspect_Id) of Boolean :=
 321      (Aspect_Constant_Indexing          => True,
 322       Aspect_Default_Iterator           => True,
 323       Aspect_Iterator_Element           => True,
 324       Aspect_Iterable                   => True,
 325       Aspect_Variable_Indexing          => True,
 326       Aspect_Aggregate                  => True,
 327       others                            => False);
 328
 329    --  The following array indicates aspects for which multiple occurrences of
 330    --  the same aspect attached to the same declaration are allowed.
 331
 332    No_Duplicates_Allowed : constant array (Aspect_Id) of Boolean :=
 333      (Aspect_Annotate      => False,
 334       Aspect_GNAT_Annotate => False,
 335       Aspect_Test_Case     => False,
 336       others               => True);
 337
 338    --  The following subtype defines aspects corresponding to library unit
 339    --  pragmas, these can only validly appear as aspects for library units,
 340    --  and result in a corresponding pragma being inserted immediately after
 341    --  the occurrence of the aspect.
 342
 343    subtype Library_Unit_Aspects is
 344      Aspect_Id range Aspect_All_Calls_Remote .. Aspect_Shared_Passive;
 345
 346    --  The following subtype defines aspects accepting an optional static
 347    --  boolean parameter indicating if the aspect should be active or
 348    --  cancelling. If the parameter is missing the effective value is True,
 349    --  enabling the aspect. If the parameter is present it must be a static
 350    --  expression of type Standard.Boolean. If the value is True, then the
 351    --  aspect is enabled. If it is False, the aspect is disabled.
 352
 353    subtype Boolean_Aspects is
 354      Aspect_Id range Aspect_Asynchronous .. Aspect_Id'Last;
 355
 356    subtype Pre_Post_Aspects is
 357      Aspect_Id range Aspect_Post .. Aspect_Precondition;
 358
 359    --  The following type is used for indicating allowed expression forms
 360
 361    type Aspect_Expression is
 362      (Expression,             -- Required expression
 363       Name,                   -- Required name
 364       Optional_Expression,    -- Optional boolean expression
 365       Optional_Name);         -- Optional name
 366
 367    --  The following array indicates what argument type is required
 368
 369    Aspect_Argument : constant array (Aspect_Id) of Aspect_Expression :=
 370      (No_Aspect                         => Optional_Expression,
 371       Aspect_Abstract_State             => Expression,
 372       Aspect_Address                    => Expression,
 373       Aspect_Aggregate                  => Expression,
 374       Aspect_Alignment                  => Expression,
 375       Aspect_Always_Terminates          => Optional_Expression,
 376       Aspect_Annotate                   => Expression,
 377       Aspect_Async_Readers              => Optional_Expression,
 378       Aspect_Async_Writers              => Optional_Expression,
 379       Aspect_Attach_Handler             => Expression,
 380       Aspect_Bit_Order                  => Expression,
 381       Aspect_Component_Size             => Expression,
 382       Aspect_Constant_After_Elaboration => Optional_Expression,
 383       Aspect_Constant_Indexing          => Name,
 384       Aspect_Contract_Cases             => Expression,
 385       Aspect_Convention                 => Name,
 386       Aspect_CPU                        => Expression,
 387       Aspect_Default_Component_Value    => Expression,
 388       Aspect_Default_Initial_Condition  => Optional_Expression,
 389       Aspect_Default_Iterator           => Name,
 390       Aspect_Default_Storage_Pool       => Expression,
 391       Aspect_Default_Value              => Expression,
 392       Aspect_Depends                    => Expression,
 393       Aspect_Designated_Storage_Model   => Name,
 394       Aspect_Dimension                  => Expression,
 395       Aspect_Dimension_System           => Expression,
 396       Aspect_Dispatching_Domain         => Expression,
 397       Aspect_Dynamic_Predicate          => Expression,
 398       Aspect_Effective_Reads            => Optional_Expression,
 399       Aspect_Effective_Writes           => Optional_Expression,
 400       Aspect_Exceptional_Cases          => Expression,
 401       Aspect_Extensions_Visible         => Optional_Expression,
 402       Aspect_External_Name              => Expression,
 403       Aspect_External_Tag               => Expression,
 404       Aspect_Ghost                      => Optional_Expression,
 405       Aspect_Ghost_Predicate            => Expression,
 406       Aspect_Global                     => Expression,
 407       Aspect_GNAT_Annotate              => Expression,
 408       Aspect_Implicit_Dereference       => Name,
 409       Aspect_Initial_Condition          => Expression,
 410       Aspect_Initializes                => Expression,
 411       Aspect_Input                      => Name,
 412       Aspect_Integer_Literal            => Name,
 413       Aspect_Interrupt_Priority         => Expression,
 414       Aspect_Invariant                  => Expression,
 415       Aspect_Iterable                   => Expression,
 416       Aspect_Iterator_Element           => Name,
 417       Aspect_Link_Name                  => Expression,
 418       Aspect_Linker_Section             => Expression,
 419       Aspect_Machine_Radix              => Expression,
 420       Aspect_Max_Entry_Queue_Depth      => Expression,
 421       Aspect_Max_Entry_Queue_Length     => Expression,
 422       Aspect_Max_Queue_Length           => Expression,
 423       Aspect_No_Caching                 => Optional_Expression,
 424       Aspect_No_Controlled_Parts        => Optional_Expression,
 425       Aspect_No_Task_Parts              => Optional_Expression,
 426       Aspect_Object_Size                => Expression,
 427       Aspect_Obsolescent                => Optional_Expression,
 428       Aspect_Output                     => Name,
 429       Aspect_Part_Of                    => Expression,
 430       Aspect_Post                       => Expression,
 431       Aspect_Postcondition              => Expression,
 432       Aspect_Pre                        => Expression,
 433       Aspect_Precondition               => Expression,
 434       Aspect_Predicate                  => Expression,
 435       Aspect_Predicate_Failure          => Expression,
 436       Aspect_Priority                   => Expression,
 437       Aspect_Put_Image                  => Name,
 438       Aspect_Read                       => Name,
 439       Aspect_Real_Literal               => Name,
 440       Aspect_Refined_Depends            => Expression,
 441       Aspect_Refined_Global             => Expression,
 442       Aspect_Refined_Post               => Expression,
 443       Aspect_Refined_State              => Expression,
 444       Aspect_Relative_Deadline          => Expression,
 445       Aspect_Relaxed_Initialization     => Optional_Expression,
 446       Aspect_Scalar_Storage_Order       => Expression,
 447       Aspect_Secondary_Stack_Size       => Expression,
 448       Aspect_Simple_Storage_Pool        => Name,
 449       Aspect_Size                       => Expression,
 450       Aspect_Small                      => Expression,
 451       Aspect_SPARK_Mode                 => Optional_Name,
 452       Aspect_Stable_Properties          => Expression,
 453       Aspect_Static_Predicate           => Expression,
 454       Aspect_Storage_Model_Type         => Optional_Expression,
 455       Aspect_Storage_Pool               => Name,
 456       Aspect_Storage_Size               => Expression,
 457       Aspect_Stream_Size                => Expression,
 458       Aspect_String_Literal             => Name,
 459       Aspect_Subprogram_Variant         => Expression,
 460       Aspect_Suppress                   => Name,
 461       Aspect_Synchronization            => Name,
 462       Aspect_Test_Case                  => Expression,
 463       Aspect_Type_Invariant             => Expression,
 464       Aspect_Unimplemented              => Optional_Expression,
 465       Aspect_Unsuppress                 => Name,
 466       Aspect_Value_Size                 => Expression,
 467       Aspect_Variable_Indexing          => Name,
 468       Aspect_Volatile_Function          => Optional_Expression,
 469       Aspect_Warnings                   => Name,
 470       Aspect_Write                      => Name,
 471
 472       Boolean_Aspects                   => Optional_Expression,
 473       Library_Unit_Aspects              => Optional_Expression);
 474
 475    --  The following array indicates what aspects are representation aspects
 476
 477    Is_Representation_Aspect : constant array (Aspect_Id) of Boolean :=
 478      (No_Aspect                           => False,
 479       Aspect_Abstract_State               => False,
 480       Aspect_Address                      => True,
 481       Aspect_Aggregate                    => False,
 482       Aspect_Alignment                    => True,
 483       Aspect_Always_Terminates            => False,
 484       Aspect_Annotate                     => False,
 485       Aspect_Async_Readers                => False,
 486       Aspect_Async_Writers                => False,
 487       Aspect_Attach_Handler               => False,
 488       Aspect_Bit_Order                    => True,
 489       Aspect_Component_Size               => True,
 490       Aspect_Constant_After_Elaboration   => False,
 491       Aspect_Constant_Indexing            => False,
 492       Aspect_Contract_Cases               => False,
 493       Aspect_Convention                   => True,
 494       Aspect_CPU                          => False,
 495       Aspect_CUDA_Device                  => False,
 496       Aspect_CUDA_Global                  => False,
 497       Aspect_Default_Component_Value      => True,
 498       Aspect_Default_Initial_Condition    => False,
 499       Aspect_Default_Iterator             => False,
 500       Aspect_Default_Storage_Pool         => True,
 501       Aspect_Default_Value                => True,
 502       Aspect_Depends                      => False,
 503       Aspect_Designated_Storage_Model     => True,
 504       Aspect_Dimension                    => False,
 505       Aspect_Dimension_System             => False,
 506       Aspect_Dispatching_Domain           => False,
 507       Aspect_Dynamic_Predicate            => False,
 508       Aspect_Effective_Reads              => False,
 509       Aspect_Effective_Writes             => False,
 510       Aspect_Exceptional_Cases            => False,
 511       Aspect_Exclusive_Functions          => False,
 512       Aspect_Extensions_Visible           => False,
 513       Aspect_External_Name                => False,
 514       Aspect_External_Tag                 => False,
 515       Aspect_Ghost                        => False,
 516       Aspect_Ghost_Predicate              => False,
 517       Aspect_Global                       => False,
 518       Aspect_GNAT_Annotate                => False,
 519       Aspect_Implicit_Dereference         => False,
 520       Aspect_Initial_Condition            => False,
 521       Aspect_Initializes                  => False,
 522       Aspect_Input                        => False,
 523       Aspect_Integer_Literal              => False,
 524       Aspect_Interrupt_Priority           => False,
 525       Aspect_Invariant                    => False,
 526       Aspect_Iterable                     => False,
 527       Aspect_Iterator_Element             => False,
 528       Aspect_Link_Name                    => True,
 529       Aspect_Linker_Section               => True,
 530       Aspect_Machine_Radix                => True,
 531       Aspect_Max_Entry_Queue_Depth        => False,
 532       Aspect_Max_Entry_Queue_Length       => False,
 533       Aspect_Max_Queue_Length             => False,
 534       Aspect_No_Caching                   => False,
 535       Aspect_No_Controlled_Parts          => False,
 536       Aspect_No_Task_Parts                => False,
 537       Aspect_Object_Size                  => True,
 538       Aspect_Obsolescent                  => False,
 539       Aspect_Output                       => False,
 540       Aspect_Part_Of                      => False,
 541       Aspect_Post                         => False,
 542       Aspect_Postcondition                => False,
 543       Aspect_Pre                          => False,
 544       Aspect_Precondition                 => False,
 545       Aspect_Predicate                    => False,
 546       Aspect_Predicate_Failure            => False,
 547       Aspect_Priority                     => False,
 548       Aspect_Put_Image                    => False,
 549       Aspect_Read                         => False,
 550       Aspect_Real_Literal                 => False,
 551       Aspect_Refined_Depends              => False,
 552       Aspect_Refined_Global               => False,
 553       Aspect_Refined_Post                 => False,
 554       Aspect_Refined_State                => False,
 555       Aspect_Relative_Deadline            => False,
 556       Aspect_Relaxed_Initialization       => False,
 557       Aspect_Scalar_Storage_Order         => True,
 558       Aspect_Secondary_Stack_Size         => True,
 559       Aspect_Simple_Storage_Pool          => True,
 560       Aspect_Size                         => True,
 561       Aspect_Small                        => True,
 562       Aspect_SPARK_Mode                   => False,
 563       Aspect_Stable_Properties            => False,
 564       Aspect_Static_Predicate             => False,
 565       Aspect_Storage_Model_Type           => False,
 566       Aspect_Storage_Pool                 => True,
 567       Aspect_Storage_Size                 => True,
 568       Aspect_Stream_Size                  => True,
 569       Aspect_String_Literal               => False,
 570       Aspect_Subprogram_Variant           => False,
 571       Aspect_Suppress                     => False,
 572       Aspect_Synchronization              => False,
 573       Aspect_Test_Case                    => False,
 574       Aspect_Type_Invariant               => False,
 575       Aspect_Unimplemented                => False,
 576       Aspect_Unsuppress                   => False,
 577       Aspect_Value_Size                   => True,
 578       Aspect_Variable_Indexing            => False,
 579       Aspect_Volatile_Function            => False,
 580       Aspect_Warnings                     => False,
 581       Aspect_Write                        => False,
 582
 583       Library_Unit_Aspects                => False,
 584
 585       Aspect_Asynchronous                 => True,
 586       Aspect_Atomic                       => True,
 587       Aspect_Atomic_Components            => True,
 588       Aspect_Disable_Controlled           => False,
 589       Aspect_Discard_Names                => True,
 590       Aspect_Export                       => True,
 591       Aspect_Favor_Top_Level              => False,
 592       Aspect_Full_Access_Only             => True,
 593       Aspect_Independent                  => True,
 594       Aspect_Independent_Components       => True,
 595       Aspect_Import                       => True,
 596       Aspect_Inline                       => False,
 597       Aspect_Inline_Always                => False,
 598       Aspect_Interrupt_Handler            => False,
 599       Aspect_Lock_Free                    => False,
 600       Aspect_No_Inline                    => False,
 601       Aspect_No_Return                    => False,
 602       Aspect_No_Tagged_Streams            => False,
 603       Aspect_Pack                         => True,
 604       Aspect_Persistent_BSS               => True,
 605       Aspect_Preelaborable_Initialization => False,
 606       Aspect_Pure_Function                => False,
 607       Aspect_Remote_Access_Type           => False,
 608       Aspect_Shared                       => True,
 609       Aspect_Simple_Storage_Pool_Type     => True,
 610       Aspect_Static                       => False,
 611       Aspect_Suppress_Debug_Info          => False,
 612       Aspect_Suppress_Initialization      => False,
 613       Aspect_Thread_Local_Storage         => True,
 614       Aspect_Unchecked_Union              => True,
 615       Aspect_Universal_Aliasing           => False,
 616       Aspect_Unmodified                   => False,
 617       Aspect_Unreferenced                 => False,
 618       Aspect_Unreferenced_Objects         => False,
 619       Aspect_Volatile                     => True,
 620       Aspect_Volatile_Components          => True,
 621       Aspect_Volatile_Full_Access         => True,
 622       Aspect_Yield                        => False);
 623
 624    -----------------------------------------
 625    -- Table Linking Names and Aspect_Id's --
 626    -----------------------------------------
 627
 628    --  Table linking aspect names and id's
 629
 630    Aspect_Names : constant array (Aspect_Id) of Name_Id :=
 631      (No_Aspect                           => No_Name,
 632       Aspect_Abstract_State               => Name_Abstract_State,
 633       Aspect_Address                      => Name_Address,
 634       Aspect_Aggregate                    => Name_Aggregate,
 635       Aspect_Alignment                    => Name_Alignment,
 636       Aspect_All_Calls_Remote             => Name_All_Calls_Remote,
 637       Aspect_Always_Terminates            => Name_Always_Terminates,
 638       Aspect_Annotate                     => Name_Annotate,
 639       Aspect_Async_Readers                => Name_Async_Readers,
 640       Aspect_Async_Writers                => Name_Async_Writers,
 641       Aspect_Asynchronous                 => Name_Asynchronous,
 642       Aspect_Atomic                       => Name_Atomic,
 643       Aspect_Atomic_Components            => Name_Atomic_Components,
 644       Aspect_Attach_Handler               => Name_Attach_Handler,
 645       Aspect_Bit_Order                    => Name_Bit_Order,
 646       Aspect_Component_Size               => Name_Component_Size,
 647       Aspect_Constant_After_Elaboration   => Name_Constant_After_Elaboration,
 648       Aspect_Constant_Indexing            => Name_Constant_Indexing,
 649       Aspect_Contract_Cases               => Name_Contract_Cases,
 650       Aspect_Convention                   => Name_Convention,
 651       Aspect_CPU                          => Name_CPU,
 652       Aspect_CUDA_Device                  => Name_CUDA_Device,
 653       Aspect_CUDA_Global                  => Name_CUDA_Global,
 654       Aspect_Default_Component_Value      => Name_Default_Component_Value,
 655       Aspect_Default_Initial_Condition    => Name_Default_Initial_Condition,
 656       Aspect_Default_Iterator             => Name_Default_Iterator,
 657       Aspect_Default_Storage_Pool         => Name_Default_Storage_Pool,
 658       Aspect_Default_Value                => Name_Default_Value,
 659       Aspect_Depends                      => Name_Depends,
 660       Aspect_Designated_Storage_Model     => Name_Designated_Storage_Model,
 661       Aspect_Dimension                    => Name_Dimension,
 662       Aspect_Dimension_System             => Name_Dimension_System,
 663       Aspect_Disable_Controlled           => Name_Disable_Controlled,
 664       Aspect_Discard_Names                => Name_Discard_Names,
 665       Aspect_Dispatching_Domain           => Name_Dispatching_Domain,
 666       Aspect_Dynamic_Predicate            => Name_Dynamic_Predicate,
 667       Aspect_Effective_Reads              => Name_Effective_Reads,
 668       Aspect_Effective_Writes             => Name_Effective_Writes,
 669       Aspect_Elaborate_Body               => Name_Elaborate_Body,
 670       Aspect_Exceptional_Cases            => Name_Exceptional_Cases,
 671       Aspect_Exclusive_Functions          => Name_Exclusive_Functions,
 672       Aspect_Export                       => Name_Export,
 673       Aspect_Extensions_Visible           => Name_Extensions_Visible,
 674       Aspect_External_Name                => Name_External_Name,
 675       Aspect_External_Tag                 => Name_External_Tag,
 676       Aspect_Favor_Top_Level              => Name_Favor_Top_Level,
 677       Aspect_Full_Access_Only             => Name_Full_Access_Only,
 678       Aspect_Ghost                        => Name_Ghost,
 679       Aspect_Ghost_Predicate              => Name_Ghost_Predicate,
 680       Aspect_Global                       => Name_Global,
 681       Aspect_GNAT_Annotate                => Name_GNAT_Annotate,
 682       Aspect_Implicit_Dereference         => Name_Implicit_Dereference,
 683       Aspect_Import                       => Name_Import,
 684       Aspect_Independent                  => Name_Independent,
 685       Aspect_Independent_Components       => Name_Independent_Components,
 686       Aspect_Inline                       => Name_Inline,
 687       Aspect_Inline_Always                => Name_Inline_Always,
 688       Aspect_Initial_Condition            => Name_Initial_Condition,
 689       Aspect_Initializes                  => Name_Initializes,
 690       Aspect_Input                        => Name_Input,
 691       Aspect_Integer_Literal              => Name_Integer_Literal,
 692       Aspect_Interrupt_Handler            => Name_Interrupt_Handler,
 693       Aspect_Interrupt_Priority           => Name_Interrupt_Priority,
 694       Aspect_Invariant                    => Name_Invariant,
 695       Aspect_Iterator_Element             => Name_Iterator_Element,
 696       Aspect_Iterable                     => Name_Iterable,
 697       Aspect_Link_Name                    => Name_Link_Name,
 698       Aspect_Linker_Section               => Name_Linker_Section,
 699       Aspect_Lock_Free                    => Name_Lock_Free,
 700       Aspect_Machine_Radix                => Name_Machine_Radix,
 701       Aspect_Max_Entry_Queue_Depth        => Name_Max_Entry_Queue_Depth,
 702       Aspect_Max_Entry_Queue_Length       => Name_Max_Entry_Queue_Length,
 703       Aspect_Max_Queue_Length             => Name_Max_Queue_Length,
 704       Aspect_No_Caching                   => Name_No_Caching,
 705       Aspect_No_Controlled_Parts          => Name_No_Controlled_Parts,
 706       Aspect_No_Task_Parts                => Name_No_Task_Parts,
 707       Aspect_No_Elaboration_Code_All      => Name_No_Elaboration_Code_All,
 708       Aspect_No_Inline                    => Name_No_Inline,
 709       Aspect_No_Return                    => Name_No_Return,
 710       Aspect_No_Tagged_Streams            => Name_No_Tagged_Streams,
 711       Aspect_Object_Size                  => Name_Object_Size,
 712       Aspect_Obsolescent                  => Name_Obsolescent,
 713       Aspect_Output                       => Name_Output,
 714       Aspect_Pack                         => Name_Pack,
 715       Aspect_Part_Of                      => Name_Part_Of,
 716       Aspect_Persistent_BSS               => Name_Persistent_BSS,
 717       Aspect_Post                         => Name_Post,
 718       Aspect_Postcondition                => Name_Postcondition,
 719       Aspect_Pre                          => Name_Pre,
 720       Aspect_Precondition                 => Name_Precondition,
 721       Aspect_Predicate                    => Name_Predicate,
 722       Aspect_Predicate_Failure            => Name_Predicate_Failure,
 723       Aspect_Preelaborable_Initialization => Name_Preelaborable_Initialization,
 724       Aspect_Preelaborate                 => Name_Preelaborate,
 725       Aspect_Priority                     => Name_Priority,
 726       Aspect_Pure                         => Name_Pure,
 727       Aspect_Pure_Function                => Name_Pure_Function,
 728       Aspect_Put_Image                    => Name_Put_Image,
 729       Aspect_Read                         => Name_Read,
 730       Aspect_Real_Literal                 => Name_Real_Literal,
 731       Aspect_Refined_Depends              => Name_Refined_Depends,
 732       Aspect_Refined_Global               => Name_Refined_Global,
 733       Aspect_Refined_Post                 => Name_Refined_Post,
 734       Aspect_Refined_State                => Name_Refined_State,
 735       Aspect_Relative_Deadline            => Name_Relative_Deadline,
 736       Aspect_Relaxed_Initialization       => Name_Relaxed_Initialization,
 737       Aspect_Remote_Access_Type           => Name_Remote_Access_Type,
 738       Aspect_Remote_Call_Interface        => Name_Remote_Call_Interface,
 739       Aspect_Remote_Types                 => Name_Remote_Types,
 740       Aspect_Scalar_Storage_Order         => Name_Scalar_Storage_Order,
 741       Aspect_Secondary_Stack_Size         => Name_Secondary_Stack_Size,
 742       Aspect_Shared                       => Name_Shared,
 743       Aspect_Shared_Passive               => Name_Shared_Passive,
 744       Aspect_Simple_Storage_Pool          => Name_Simple_Storage_Pool,
 745       Aspect_Simple_Storage_Pool_Type     => Name_Simple_Storage_Pool_Type,
 746       Aspect_Size                         => Name_Size,
 747       Aspect_Small                        => Name_Small,
 748       Aspect_SPARK_Mode                   => Name_SPARK_Mode,
 749       Aspect_Stable_Properties            => Name_Stable_Properties,
 750       Aspect_Static                       => Name_Static,
 751       Aspect_Static_Predicate             => Name_Static_Predicate,
 752       Aspect_Storage_Model_Type           => Name_Storage_Model_Type,
 753       Aspect_Storage_Pool                 => Name_Storage_Pool,
 754       Aspect_Storage_Size                 => Name_Storage_Size,
 755       Aspect_Stream_Size                  => Name_Stream_Size,
 756       Aspect_String_Literal               => Name_String_Literal,
 757       Aspect_Subprogram_Variant           => Name_Subprogram_Variant,
 758       Aspect_Suppress                     => Name_Suppress,
 759       Aspect_Suppress_Debug_Info          => Name_Suppress_Debug_Info,
 760       Aspect_Suppress_Initialization      => Name_Suppress_Initialization,
 761       Aspect_Thread_Local_Storage         => Name_Thread_Local_Storage,
 762       Aspect_Synchronization              => Name_Synchronization,
 763       Aspect_Test_Case                    => Name_Test_Case,
 764       Aspect_Type_Invariant               => Name_Type_Invariant,
 765       Aspect_Unchecked_Union              => Name_Unchecked_Union,
 766       Aspect_Unimplemented                => Name_Unimplemented,
 767       Aspect_Universal_Aliasing           => Name_Universal_Aliasing,
 768       Aspect_Unmodified                   => Name_Unmodified,
 769       Aspect_Unreferenced                 => Name_Unreferenced,
 770       Aspect_Unreferenced_Objects         => Name_Unreferenced_Objects,
 771       Aspect_Unsuppress                   => Name_Unsuppress,
 772       Aspect_Value_Size                   => Name_Value_Size,
 773       Aspect_Variable_Indexing            => Name_Variable_Indexing,
 774       Aspect_Volatile                     => Name_Volatile,
 775       Aspect_Volatile_Components          => Name_Volatile_Components,
 776       Aspect_Volatile_Full_Access         => Name_Volatile_Full_Access,
 777       Aspect_Volatile_Function            => Name_Volatile_Function,
 778       Aspect_Warnings                     => Name_Warnings,
 779       Aspect_Write                        => Name_Write,
 780       Aspect_Yield                        => Name_Yield);
 781
 782    function Get_Aspect_Id (Name : Name_Id) return Aspect_Id;
 783    pragma Inline (Get_Aspect_Id);
 784    --  Given a name Nam, returns the corresponding aspect id value. If the name
 785    --  does not match any aspect, then No_Aspect is returned as the result.
 786
 787    function Get_Aspect_Id (Aspect : Node_Id) return Aspect_Id;
 788    pragma Inline (Get_Aspect_Id);
 789    --  Given an aspect specification, return the corresponding aspect_id value.
 790    --  If the name does not match any aspect, return No_Aspect.
 791
 792    function Is_Aspect_Id (Aspect : Name_Id) return Boolean;
 793    pragma Inline (Is_Aspect_Id);
 794    --  Return True if a corresponding aspect id exists
 795
 796    function Is_Aspect_Id (Aspect : Node_Id) return Boolean;
 797    pragma Inline (Is_Aspect_Id);
 798    --  Return True if a corresponding aspect id exists
 799
 800    ------------------------------------
 801    -- Delaying Evaluation of Aspects --
 802    ------------------------------------
 803
 804    --  The RM requires that all language defined aspects taking an expression
 805    --  delay evaluation of the expression till the freeze point of the entity
 806    --  to which the aspect applies. This allows forward references, and is of
 807    --  use for example in connection with preconditions and postconditions
 808    --  where the requirement of making all references in contracts to local
 809    --  functions be backwards references would be onerous.
 810
 811    --  For consistency, even attributes like Size are delayed, so we can do:
 812
 813    --    type A is range 1 .. 10
 814    --      with Size => Not_Defined_Yet;
 815    --    ..
 816    --    Not_Defined_Yet : constant := 64;
 817
 818    --  Resulting in A having a size of 64, which gets set when A is frozen.
 819    --  Furthermore, we can have a situation like
 820
 821    --    type A is range 1 .. 10
 822    --      with Size => Not_Defined_Yet;
 823    --    ..
 824    --    type B is new A;
 825    --    ..
 826    --    Not_Defined_Yet : constant := 64;
 827
 828    --  where the Size of A is considered to have been previously specified at
 829    --  the point of derivation, even though the actual value of the size is
 830    --  not known yet, and in this example B inherits the size value of 64.
 831
 832    --  Our normal implementation model (prior to Ada 2012) was simply to copy
 833    --  inheritable attributes at the point of derivation. Then any subsequent
 834    --  representation items apply either to the parent type, not affecting the
 835    --  derived type, or to the derived type, not affecting the parent type.
 836
 837    --  To deal with the delayed aspect case, we use two flags. The first is
 838    --  set on the parent type if it has delayed representation aspects. This
 839    --  flag Has_Delayed_Rep_Aspects indicates that if we derive from this type
 840    --  we have to worry about making sure we inherit any delayed aspects. The
 841    --  second flag is set on a derived type: May_Inherit_Delayed_Rep_Aspects
 842    --  is set if the parent type has Has_Delayed_Rep_Aspects set.
 843
 844    --  When we freeze a derived type, if the May_Inherit_Delayed_Rep_Aspects
 845    --  flag is set, then we call Sem_Ch13.Inherit_Delayed_Rep_Aspects when
 846    --  the derived type is frozen, which deals with the necessary copying of
 847    --  information from the parent type, which must be frozen at that point
 848    --  (since freezing the derived type first freezes the parent type).
 849
 850    --  SPARK 2014 aspects do not follow the general delay mechanism as they
 851    --  act as annotations and cannot modify the attributes of their related
 852    --  constructs. To handle forward references in such aspects, the compiler
 853    --  delays the analysis of their respective pragmas by collecting them in
 854    --  N_Contract nodes. The pragmas are then analyzed at the end of the
 855    --  declarative region containing the related construct. For details,
 856    --  see routines Analyze_xxx_In_Decl_Part.
 857
 858    --  The following shows which aspects are delayed. There are three cases:
 859
 860    type Delay_Type is
 861      (Always_Delay,
 862       --  This aspect is not a representation aspect that can be inherited and
 863       --  is always delayed, as required by the language definition.
 864
 865       Never_Delay,
 866       --  There are two cases. There are language defined aspects like
 867       --  Convention where the "expression" is simply an uninterpreted
 868       --  identifier, and there is no issue of evaluating it and thus no
 869       --  issue of delaying the evaluation. The second case is implementation
 870       --  defined aspects where we have decided that we don't want to allow
 871       --  delays (and for our own aspects we can do what we like).
 872
 873       Rep_Aspect);
 874       --  These are the cases of representation aspects that are in general
 875       --  delayed, and where there is a potential issue of derived types that
 876       --  inherit delayed representation values.
 877
 878    --  Note: even if this table indicates that an aspect is delayed, we never
 879    --  delay Boolean aspects that have a missing expression (taken as True),
 880    --  or expressions for delayed rep items that consist of an integer literal
 881    --  (most cases of Size etc. in practice), since in these cases we know we
 882    --  can get the value of the expression without delay. Note that we still
 883    --  need to delay Boolean aspects that are specifically set to True:
 884
 885    --     type R is array (0 .. 31) of Boolean
 886    --       with Pack => True;
 887    --     True : constant Boolean := False;
 888
 889    --  This is nonsense, but we need to make it work and result in R not
 890    --  being packed, and if we have something like:
 891
 892    --     type R is array (0 .. 31) of Boolean
 893    --       with Pack => True;
 894    --     RR : R;
 895    --     True : constant Boolean := False;
 896
 897    --  This is illegal because the visibility of True changes after the freeze
 898    --  point, which is not allowed, and we need the delay mechanism to properly
 899    --  diagnose this error.
 900
 901    Aspect_Delay : constant array (Aspect_Id) of Delay_Type :=
 902      (No_Aspect                           => Always_Delay,
 903       Aspect_Address                      => Always_Delay,
 904       Aspect_Aggregate                    => Always_Delay,
 905       Aspect_All_Calls_Remote             => Always_Delay,
 906       Aspect_Asynchronous                 => Always_Delay,
 907       Aspect_Attach_Handler               => Always_Delay,
 908       Aspect_Constant_Indexing            => Always_Delay,
 909       Aspect_CPU                          => Always_Delay,
 910       Aspect_CUDA_Device                  => Always_Delay,
 911       Aspect_CUDA_Global                  => Always_Delay,
 912       Aspect_Default_Iterator             => Always_Delay,
 913       Aspect_Default_Storage_Pool         => Always_Delay,
 914       Aspect_Default_Value                => Always_Delay,
 915       Aspect_Default_Component_Value      => Always_Delay,
 916       Aspect_Designated_Storage_Model     => Always_Delay,
 917       Aspect_Discard_Names                => Always_Delay,
 918       Aspect_Dispatching_Domain           => Always_Delay,
 919       Aspect_Dynamic_Predicate            => Always_Delay,
 920       Aspect_Elaborate_Body               => Always_Delay,
 921       Aspect_Exclusive_Functions          => Always_Delay,
 922       Aspect_External_Name                => Always_Delay,
 923       Aspect_External_Tag                 => Always_Delay,
 924       Aspect_Favor_Top_Level              => Always_Delay,
 925       Aspect_Ghost_Predicate              => Always_Delay,
 926       Aspect_Implicit_Dereference         => Always_Delay,
 927       Aspect_Independent                  => Always_Delay,
 928       Aspect_Independent_Components       => Always_Delay,
 929       Aspect_Inline                       => Always_Delay,
 930       Aspect_Inline_Always                => Always_Delay,
 931       Aspect_Input                        => Always_Delay,
 932       Aspect_Integer_Literal              => Always_Delay,
 933       Aspect_Interrupt_Handler            => Always_Delay,
 934       Aspect_Interrupt_Priority           => Always_Delay,
 935       Aspect_Invariant                    => Always_Delay,
 936       Aspect_Iterable                     => Always_Delay,
 937       Aspect_Iterator_Element             => Always_Delay,
 938       Aspect_Link_Name                    => Always_Delay,
 939       Aspect_Linker_Section               => Always_Delay,
 940       Aspect_Lock_Free                    => Always_Delay,
 941       Aspect_No_Inline                    => Always_Delay,
 942       Aspect_No_Return                    => Always_Delay,
 943       Aspect_Output                       => Always_Delay,
 944       Aspect_Persistent_BSS               => Always_Delay,
 945       Aspect_Post                         => Always_Delay,
 946       Aspect_Postcondition                => Always_Delay,
 947       Aspect_Pre                          => Always_Delay,
 948       Aspect_Precondition                 => Always_Delay,
 949       Aspect_Predicate                    => Always_Delay,
 950       Aspect_Predicate_Failure            => Always_Delay,
 951       Aspect_Preelaborable_Initialization => Always_Delay,
 952       Aspect_Preelaborate                 => Always_Delay,
 953       Aspect_Priority                     => Always_Delay,
 954       Aspect_Pure                         => Always_Delay,
 955       Aspect_Pure_Function                => Always_Delay,
 956       Aspect_Put_Image                    => Always_Delay,
 957       Aspect_Read                         => Always_Delay,
 958       Aspect_Real_Literal                 => Always_Delay,
 959       Aspect_Relative_Deadline            => Always_Delay,
 960       Aspect_Remote_Access_Type           => Always_Delay,
 961       Aspect_Remote_Call_Interface        => Always_Delay,
 962       Aspect_Remote_Types                 => Always_Delay,
 963       Aspect_Secondary_Stack_Size         => Always_Delay,
 964       Aspect_Shared                       => Always_Delay,
 965       Aspect_Shared_Passive               => Always_Delay,
 966       Aspect_Simple_Storage_Pool          => Always_Delay,
 967       Aspect_Simple_Storage_Pool_Type     => Always_Delay,
 968       Aspect_Static_Predicate             => Always_Delay,
 969       Aspect_Storage_Model_Type           => Always_Delay,
 970       Aspect_Storage_Pool                 => Always_Delay,
 971       Aspect_Stream_Size                  => Always_Delay,
 972       Aspect_String_Literal               => Always_Delay,
 973       Aspect_Suppress                     => Always_Delay,
 974       Aspect_Suppress_Debug_Info          => Always_Delay,
 975       Aspect_Suppress_Initialization      => Always_Delay,
 976       Aspect_Thread_Local_Storage         => Always_Delay,
 977       Aspect_Type_Invariant               => Always_Delay,
 978       Aspect_Unchecked_Union              => Always_Delay,
 979       Aspect_Universal_Aliasing           => Always_Delay,
 980       Aspect_Unmodified                   => Always_Delay,
 981       Aspect_Unreferenced                 => Always_Delay,
 982       Aspect_Unreferenced_Objects         => Always_Delay,
 983       Aspect_Unsuppress                   => Always_Delay,
 984       Aspect_Variable_Indexing            => Always_Delay,
 985       Aspect_Write                        => Always_Delay,
 986
 987       Aspect_Abstract_State               => Never_Delay,
 988       Aspect_Always_Terminates            => Never_Delay,
 989       Aspect_Annotate                     => Never_Delay,
 990       Aspect_Async_Readers                => Never_Delay,
 991       Aspect_Async_Writers                => Never_Delay,
 992       Aspect_Constant_After_Elaboration   => Never_Delay,
 993       Aspect_Contract_Cases               => Never_Delay,
 994       Aspect_Convention                   => Never_Delay,
 995       Aspect_Default_Initial_Condition    => Never_Delay,
 996       Aspect_Depends                      => Never_Delay,
 997       Aspect_Dimension                    => Never_Delay,
 998       Aspect_Dimension_System             => Never_Delay,
 999       Aspect_Disable_Controlled           => Never_Delay,
1000       Aspect_Effective_Reads              => Never_Delay,
1001       Aspect_Effective_Writes             => Never_Delay,
1002       Aspect_Exceptional_Cases            => Never_Delay,
1003       Aspect_Export                       => Never_Delay,
1004       Aspect_Extensions_Visible           => Never_Delay,
1005       Aspect_Ghost                        => Never_Delay,
1006       Aspect_Global                       => Never_Delay,
1007       Aspect_GNAT_Annotate                => Never_Delay,
1008       Aspect_Import                       => Never_Delay,
1009       Aspect_Initial_Condition            => Never_Delay,
1010       Aspect_Initializes                  => Never_Delay,
1011       Aspect_Max_Entry_Queue_Depth        => Never_Delay,
1012       Aspect_Max_Entry_Queue_Length       => Never_Delay,
1013       Aspect_Max_Queue_Length             => Never_Delay,
1014       Aspect_No_Caching                   => Never_Delay,
1015       Aspect_No_Controlled_Parts          => Never_Delay,
1016       Aspect_No_Task_Parts                => Never_Delay,
1017       Aspect_No_Elaboration_Code_All      => Never_Delay,
1018       Aspect_No_Tagged_Streams            => Never_Delay,
1019       Aspect_Obsolescent                  => Never_Delay,
1020       Aspect_Part_Of                      => Never_Delay,
1021       Aspect_Refined_Depends              => Never_Delay,
1022       Aspect_Refined_Global               => Never_Delay,
1023       Aspect_Refined_Post                 => Never_Delay,
1024       Aspect_Refined_State                => Never_Delay,
1025       Aspect_Relaxed_Initialization       => Never_Delay,
1026       Aspect_SPARK_Mode                   => Never_Delay,
1027       Aspect_Stable_Properties            => Always_Delay,
1028       Aspect_Static                       => Never_Delay,
1029       Aspect_Subprogram_Variant           => Never_Delay,
1030       Aspect_Synchronization              => Never_Delay,
1031       Aspect_Test_Case                    => Never_Delay,
1032       Aspect_Unimplemented                => Never_Delay,
1033       Aspect_Volatile_Function            => Never_Delay,
1034       Aspect_Warnings                     => Never_Delay,
1035       Aspect_Yield                        => Never_Delay,
1036
1037       Aspect_Alignment                    => Rep_Aspect,
1038       Aspect_Atomic                       => Rep_Aspect,
1039       Aspect_Atomic_Components            => Rep_Aspect,
1040       Aspect_Bit_Order                    => Rep_Aspect,
1041       Aspect_Component_Size               => Rep_Aspect,
1042       Aspect_Full_Access_Only             => Rep_Aspect,
1043       Aspect_Machine_Radix                => Rep_Aspect,
1044       Aspect_Object_Size                  => Rep_Aspect,
1045       Aspect_Pack                         => Rep_Aspect,
1046       Aspect_Scalar_Storage_Order         => Rep_Aspect,
1047       Aspect_Size                         => Rep_Aspect,
1048       Aspect_Small                        => Rep_Aspect,
1049       Aspect_Storage_Size                 => Rep_Aspect,
1050       Aspect_Value_Size                   => Rep_Aspect,
1051       Aspect_Volatile                     => Rep_Aspect,
1052       Aspect_Volatile_Components          => Rep_Aspect,
1053       Aspect_Volatile_Full_Access         => Rep_Aspect);
1054
1055    ------------------------------------------------
1056    -- Handling of Aspect Specifications on Stubs --
1057    ------------------------------------------------
1058
1059    --  Aspects that appear on the following stub nodes
1060
1061    --    N_Package_Body_Stub
1062    --    N_Protected_Body_Stub
1063    --    N_Subprogram_Body_Stub
1064    --    N_Task_Body_Stub
1065
1066    --  are treated as if they apply to the corresponding proper body. Their
1067    --  analysis is postponed until the analysis of the proper body takes place
1068    --  (see Analyze_Proper_Body). The delay is required because the analysis
1069    --  may generate extra code which would be harder to relocate to the body.
1070    --  If the proper body is present, the aspect specifications are relocated
1071    --  to the corresponding body node:
1072
1073    --    N_Package_Body
1074    --    N_Protected_Body
1075    --    N_Subprogram_Body
1076    --    N_Task_Body
1077
1078    --  The subsequent analysis takes care of the aspect-to-pragma conversions
1079    --  and verification of pragma legality. In the case where the proper body
1080    --  is not available, the aspect specifications are analyzed on the spot
1081    --  (see Analyze_Proper_Body) to catch potential errors.
1082
1083    --  The following table lists all aspects that can apply to a subprogram
1084    --  body [stub]. For instance, the following example is legal:
1085
1086    --    package P with SPARK_Mode ...;
1087    --    package body P with SPARK_Mode is ...;
1088
1089    --  The table should be synchronized with Pragma_On_Body_Or_Stub_OK in unit
1090    --  Sem_Prag.
1091
1092    Aspect_On_Body_Or_Stub_OK : constant array (Aspect_Id) of Boolean :=
1093      (Aspect_Refined_Depends              => True,
1094       Aspect_Refined_Global               => True,
1095       Aspect_Refined_Post                 => True,
1096       Aspect_SPARK_Mode                   => True,
1097       Aspect_Warnings                     => True,
1098       others                              => False);
1099
1100    -------------------------------------------------------------------
1101    -- Handling of Aspects Specifications on Single Concurrent Types --
1102    -------------------------------------------------------------------
1103
1104    --  Certain aspects that appear on the following nodes
1105
1106    --    N_Single_Protected_Declaration
1107    --    N_Single_Task_Declaration
1108
1109    --  are treated as if they apply to the anonymous object produced by the
1110    --  analysis of a single concurrent type. The following table lists all
1111    --  aspects that should apply to the anonymous object. The table should
1112    --  be synchronized with Pragma_On_Anonymous_Object_OK in unit Sem_Prag.
1113
1114    Aspect_On_Anonymous_Object_OK : constant array (Aspect_Id) of Boolean :=
1115      (Aspect_Depends                      => True,
1116       Aspect_Global                       => True,
1117       Aspect_Part_Of                      => True,
1118       others                              => False);
1119
1120    ---------------------------------------------------
1121    -- Handling of Aspect Specifications in the Tree --
1122    ---------------------------------------------------
1123
1124    --  Several kinds of declaration node permit aspect specifications in Ada
1125    --  2012 mode. If there was room in all the corresponding declaration nodes,
1126    --  we could just have a field Aspect_Specifications pointing to a list of
1127    --  nodes for the aspects (N_Aspect_Specification nodes). But there isn't
1128    --  room, so we adopt a different approach.
1129
1130    --  The following subprograms provide access to a specialized interface
1131    --  implemented internally with a hash table in the body, that provides
1132    --  access to aspect specifications.
1133
1134    function Aspect_Specifications (N : Node_Id) return List_Id;
1135    --  Given a node N, returns the list of N_Aspect_Specification nodes that
1136    --  are attached to this declaration node. If the node is in the class of
1137    --  declaration nodes that permit aspect specifications, as defined by the
1138    --  predicate above, and if their Has_Aspects flag is set to True, then this
1139    --  will always be a non-empty list. If this flag is set to False, then
1140    --  No_List is returned. Normally, the only nodes that have Has_Aspects set
1141    --  True are the nodes for which Permits_Aspect_Specifications would return
1142    --  True (i.e. the declaration nodes defined in the RM as permitting the
1143    --  presence of Aspect_Specifications). However, it is possible for the
1144    --  flag Has_Aspects to be set on other nodes as a result of Rewrite and
1145    --  Replace calls, and this function may be used to retrieve the aspect
1146    --  specifications for the original rewritten node in such cases.
1147
1148    function Aspects_On_Body_Or_Stub_OK (N : Node_Id) return Boolean;
1149    --  N denotes a body [stub] with aspects. Determine whether all aspects of N
1150    --  are allowed to appear on a body [stub].
1151
1152    procedure Exchange_Aspects (N1 : Node_Id; N2 : Node_Id);
1153    --  Exchange the aspect specifications of two nodes. If either node lacks an
1154    --  aspect specification list, the routine has no effect. It is assumed that
1155    --  both nodes can support aspects.
1156
1157    function Find_Aspect (Id            : Entity_Id;
1158                          A             : Aspect_Id;
1159                          Class_Present : Boolean := False;
1160                          Or_Rep_Item   : Boolean := False) return Node_Id;
1161    --  Find the aspect specification of aspect A (or A'Class if Class_Present)
1162    --  associated with entity I.
1163    --  If found, then return the aspect specification.
1164    --  If not found and Or_Rep_Item is true, then look for a representation
1165    --  item (as opposed to an N_Aspect_Specification node) which specifies
1166    --  the given aspect; if found, then return the representation item.
1167    --  [Currently only N_Attribute_Definition_Clause representation items
1168    --  are checked for, but support for detecting N_Pragma representation
1169    --  items could easily be added in the future if there is a need.]
1170    --  Otherwise, return Empty.
1171
1172    function Find_Value_Of_Aspect
1173      (Id            : Entity_Id;
1174       A             : Aspect_Id;
1175       Class_Present : Boolean := False) return Node_Id;
1176    --  Find the value of aspect A (or A'Class, if Class_Present) associated
1177    --  with entity Id. Return Empty if Id does not have the requested aspect.
1178
1179    function Has_Aspect (Id            : Entity_Id;
1180                         A             : Aspect_Id;
1181                         Class_Present : Boolean := False) return Boolean;
1182    --  Determine whether entity Id has aspect A (or A'Class, if Class_Present)
1183
1184    procedure Move_Aspects (From : Node_Id; To : Node_Id);
1185    --  Relocate the aspect specifications of node From to node To. On entry it
1186    --  is assumed that To does not have aspect specifications. If From has no
1187    --  aspects, the routine has no effect.
1188
1189    procedure Move_Or_Merge_Aspects (From : Node_Id; To : Node_Id);
1190    --  Relocate the aspect specifications of node From to node To. If To has
1191    --  aspects, the aspects of From are appended to the aspects of To. If From
1192    --  has no aspects, the routine has no effect. Special behavior:
1193    --    * When node From denotes a subprogram body stub without a previous
1194    --      declaration, the only aspects relocated to node To are those found
1195    --      in table Aspect_On_Body_Or_Stub_OK.
1196    --    * When node From denotes a single synchronized type declaration, the
1197    --      only aspects relocated to node To are those found in table
1198    --      Aspect_On_Anonymous_Object_OK.
1199
1200    function Permits_Aspect_Specifications (N : Node_Id) return Boolean;
1201    --  Returns True if the node N is a declaration node that permits aspect
1202    --  specifications in the grammar. It is possible for other nodes to have
1203    --  aspect specifications as a result of Rewrite or Replace calls.
1204
1205    procedure Remove_Aspects (N : Node_Id);
1206    --  Delete the aspect specifications associated with node N. If the node has
1207    --  no aspects, the routine has no effect.
1208
1209    function Same_Aspect (A1 : Aspect_Id; A2 : Aspect_Id) return Boolean;
1210    --  Returns True if A1 and A2 are (essentially) the same aspect. This is not
1211    --  a simple equality test because e.g. Post and Postcondition are the same.
1212    --  This is used for detecting duplicate aspects.
1213
1214    procedure Set_Aspect_Specifications (N : Node_Id; L : List_Id);
1215    --  The node N must be in the class of declaration nodes that permit aspect
1216    --  specifications and the Has_Aspects flag must be False on entry. L must
1217    --  be a non-empty list of N_Aspect_Specification nodes. This procedure sets
1218    --  the Has_Aspects flag to True, and makes an entry that can be retrieved
1219    --  by a subsequent Aspect_Specifications call. It is an error to call this
1220    --  procedure with a node that does not permit aspect specifications, or a
1221    --  node that has its Has_Aspects flag set True on entry, or with L being an
1222    --  empty list or No_List.
1223
1224 end Aspects;