gcc/ada/sem_prag.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                             S E M _ P R A G                              --
   6 --                                                                          --
   7 --                                 B o d y                                  --
   8 --                                                                          --
   9 --          Copyright (C) 1992-2009, 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 unit contains the semantic processing for all pragmas, both language
  27 --  and implementation defined. For most pragmas, the parser only does the
  28 --  most basic job of checking the syntax, so Sem_Prag also contains the code
  29 --  to complete the syntax checks. Certain pragmas are handled partially or
  30 --  completely by the parser (see Par.Prag for further details).
  31
  32 with Atree;    use Atree;
  33 with Casing;   use Casing;
  34 with Checks;   use Checks;
  35 with Csets;    use Csets;
  36 with Debug;    use Debug;
  37 with Einfo;    use Einfo;
  38 with Elists;   use Elists;
  39 with Errout;   use Errout;
  40 with Exp_Dist; use Exp_Dist;
  41 with Lib;      use Lib;
  42 with Lib.Writ; use Lib.Writ;
  43 with Lib.Xref; use Lib.Xref;
  44 with Namet.Sp; use Namet.Sp;
  45 with Nlists;   use Nlists;
  46 with Nmake;    use Nmake;
  47 with Opt;      use Opt;
  48 with Output;   use Output;
  49 with Restrict; use Restrict;
  50 with Rident;   use Rident;
  51 with Rtsfind;  use Rtsfind;
  52 with Sem;      use Sem;
  53 with Sem_Aux;  use Sem_Aux;
  54 with Sem_Ch3;  use Sem_Ch3;
  55 with Sem_Ch6;  use Sem_Ch6;
  56 with Sem_Ch8;  use Sem_Ch8;
  57 with Sem_Ch12; use Sem_Ch12;
  58 with Sem_Ch13; use Sem_Ch13;
  59 with Sem_Dist; use Sem_Dist;
  60 with Sem_Elim; use Sem_Elim;
  61 with Sem_Eval; use Sem_Eval;
  62 with Sem_Intr; use Sem_Intr;
  63 with Sem_Mech; use Sem_Mech;
  64 with Sem_Res;  use Sem_Res;
  65 with Sem_Type; use Sem_Type;
  66 with Sem_Util; use Sem_Util;
  67 with Sem_VFpt; use Sem_VFpt;
  68 with Sem_Warn; use Sem_Warn;
  69 with Stand;    use Stand;
  70 with Sinfo;    use Sinfo;
  71 with Sinfo.CN; use Sinfo.CN;
  72 with Sinput;   use Sinput;
  73 with Snames;   use Snames;
  74 with Stringt;  use Stringt;
  75 with Stylesw;  use Stylesw;
  76 with Table;
  77 with Targparm; use Targparm;
  78 with Tbuild;   use Tbuild;
  79 with Ttypes;
  80 with Uintp;    use Uintp;
  81 with Uname;    use Uname;
  82 with Urealp;   use Urealp;
  83 with Validsw;  use Validsw;
  84
  85 package body Sem_Prag is
  86
  87    ----------------------------------------------
  88    -- Common Handling of Import-Export Pragmas --
  89    ----------------------------------------------
  90
  91    --  In the following section, a number of Import_xxx and Export_xxx
  92    --  pragmas are defined by GNAT. These are compatible with the DEC
  93    --  pragmas of the same name, and all have the following common
  94    --  form and processing:
  95
  96    --  pragma Export_xxx
  97    --        [Internal                 =>] LOCAL_NAME
  98    --     [, [External                 =>] EXTERNAL_SYMBOL]
  99    --     [, other optional parameters   ]);
 100
 101    --  pragma Import_xxx
 102    --        [Internal                 =>] LOCAL_NAME
 103    --     [, [External                 =>] EXTERNAL_SYMBOL]
 104    --     [, other optional parameters   ]);
 105
 106    --   EXTERNAL_SYMBOL ::=
 107    --     IDENTIFIER
 108    --   | static_string_EXPRESSION
 109
 110    --  The internal LOCAL_NAME designates the entity that is imported or
 111    --  exported, and must refer to an entity in the current declarative
 112    --  part (as required by the rules for LOCAL_NAME).
 113
 114    --  The external linker name is designated by the External parameter if
 115    --  given, or the Internal parameter if not (if there is no External
 116    --  parameter, the External parameter is a copy of the Internal name).
 117
 118    --  If the External parameter is given as a string, then this string is
 119    --  treated as an external name (exactly as though it had been given as an
 120    --  External_Name parameter for a normal Import pragma).
 121
 122    --  If the External parameter is given as an identifier (or there is no
 123    --  External parameter, so that the Internal identifier is used), then
 124    --  the external name is the characters of the identifier, translated
 125    --  to all upper case letters for OpenVMS versions of GNAT, and to all
 126    --  lower case letters for all other versions
 127
 128    --  Note: the external name specified or implied by any of these special
 129    --  Import_xxx or Export_xxx pragmas override an external or link name
 130    --  specified in a previous Import or Export pragma.
 131
 132    --  Note: these and all other DEC-compatible GNAT pragmas allow full use of
 133    --  named notation, following the standard rules for subprogram calls, i.e.
 134    --  parameters can be given in any order if named notation is used, and
 135    --  positional and named notation can be mixed, subject to the rule that all
 136    --  positional parameters must appear first.
 137
 138    --  Note: All these pragmas are implemented exactly following the DEC design
 139    --  and implementation and are intended to be fully compatible with the use
 140    --  of these pragmas in the DEC Ada compiler.
 141
 142    --------------------------------------------
 143    -- Checking for Duplicated External Names --
 144    --------------------------------------------
 145
 146    --  It is suspicious if two separate Export pragmas use the same external
 147    --  name. The following table is used to diagnose this situation so that
 148    --  an appropriate warning can be issued.
 149
 150    --  The Node_Id stored is for the N_String_Literal node created to hold
 151    --  the value of the external name. The Sloc of this node is used to
 152    --  cross-reference the location of the duplication.
 153
 154    package Externals is new Table.Table (
 155      Table_Component_Type => Node_Id,
 156      Table_Index_Type     => Int,
 157      Table_Low_Bound      => 0,
 158      Table_Initial        => 100,
 159      Table_Increment      => 100,
 160      Table_Name           => "Name_Externals");
 161
 162    -------------------------------------
 163    -- Local Subprograms and Variables --
 164    -------------------------------------
 165
 166    function Adjust_External_Name_Case (N : Node_Id) return Node_Id;
 167    --  This routine is used for possible casing adjustment of an explicit
 168    --  external name supplied as a string literal (the node N), according to
 169    --  the casing requirement of Opt.External_Name_Casing. If this is set to
 170    --  As_Is, then the string literal is returned unchanged, but if it is set
 171    --  to Uppercase or Lowercase, then a new string literal with appropriate
 172    --  casing is constructed.
 173
 174    function Get_Base_Subprogram (Def_Id : Entity_Id) return Entity_Id;
 175    --  If Def_Id refers to a renamed subprogram, then the base subprogram (the
 176    --  original one, following the renaming chain) is returned. Otherwise the
 177    --  entity is returned unchanged. Should be in Einfo???
 178
 179    function Get_Pragma_Arg (Arg : Node_Id) return Node_Id;
 180    --  All the routines that check pragma arguments take either a pragma
 181    --  argument association (in which case the expression of the argument
 182    --  association is checked), or the expression directly. The function
 183    --  Get_Pragma_Arg is a utility used to deal with these two cases. If Arg
 184    --  is a pragma argument association node, then its expression is returned,
 185    --  otherwise Arg is returned unchanged.
 186
 187    procedure rv;
 188    --  This is a dummy function called by the processing for pragma Reviewable.
 189    --  It is there for assisting front end debugging. By placing a Reviewable
 190    --  pragma in the source program, a breakpoint on rv catches this place in
 191    --  the source, allowing convenient stepping to the point of interest.
 192
 193    procedure Set_Unit_Name (N : Node_Id; With_Item : Node_Id);
 194    --  Place semantic information on the argument of an Elaborate/Elaborate_All
 195    --  pragma. Entity name for unit and its parents is taken from item in
 196    --  previous with_clause that mentions the unit.
 197
 198    -------------------------------
 199    -- Adjust_External_Name_Case --
 200    -------------------------------
 201
 202    function Adjust_External_Name_Case (N : Node_Id) return Node_Id is
 203       CC : Char_Code;
 204
 205    begin
 206       --  Adjust case of literal if required
 207
 208       if Opt.External_Name_Exp_Casing = As_Is then
 209          return N;
 210
 211       else
 212          --  Copy existing string
 213
 214          Start_String;
 215
 216          --  Set proper casing
 217
 218          for J in 1 .. String_Length (Strval (N)) loop
 219             CC := Get_String_Char (Strval (N), J);
 220
 221             if Opt.External_Name_Exp_Casing = Uppercase
 222               and then CC >= Get_Char_Code ('a')
 223               and then CC <= Get_Char_Code ('z')
 224             then
 225                Store_String_Char (CC - 32);
 226
 227             elsif Opt.External_Name_Exp_Casing = Lowercase
 228               and then CC >= Get_Char_Code ('A')
 229               and then CC <= Get_Char_Code ('Z')
 230             then
 231                Store_String_Char (CC + 32);
 232
 233             else
 234                Store_String_Char (CC);
 235             end if;
 236          end loop;
 237
 238          return
 239            Make_String_Literal (Sloc (N),
 240              Strval => End_String);
 241       end if;
 242    end Adjust_External_Name_Case;
 243
 244    ------------------------------
 245    -- Analyze_PPC_In_Decl_Part --
 246    ------------------------------
 247
 248    procedure Analyze_PPC_In_Decl_Part (N : Node_Id; S : Entity_Id) is
 249       Arg1 : constant Node_Id :=
 250                First (Pragma_Argument_Associations (N));
 251       Arg2 : constant Node_Id := Next (Arg1);
 252
 253    begin
 254       --  Install formals and push subprogram spec onto scope stack so that we
 255       --  can see the formals from the pragma.
 256
 257       Install_Formals (S);
 258       Push_Scope (S);
 259
 260       --  Preanalyze the boolean expression, we treat this as a spec expression
 261       --  (i.e. similar to a default expression).
 262
 263       Preanalyze_Spec_Expression
 264         (Get_Pragma_Arg (Arg1), Standard_Boolean);
 265
 266       --  If there is a message argument, analyze it the same way
 267
 268       if Present (Arg2) then
 269          Preanalyze_Spec_Expression
 270            (Get_Pragma_Arg (Arg2), Standard_String);
 271       end if;
 272
 273       --  Remove the subprogram from the scope stack now that the pre-analysis
 274       --  of the precondition/postcondition is done.
 275
 276       End_Scope;
 277    end Analyze_PPC_In_Decl_Part;
 278
 279    --------------------
 280    -- Analyze_Pragma --
 281    --------------------
 282
 283    procedure Analyze_Pragma (N : Node_Id) is
 284       Loc     : constant Source_Ptr := Sloc (N);
 285       Pname   : constant Name_Id    := Pragma_Name (N);
 286       Prag_Id : Pragma_Id;
 287
 288       Pragma_Exit : exception;
 289       --  This exception is used to exit pragma processing completely. It is
 290       --  used when an error is detected, and no further processing is
 291       --  required. It is also used if an earlier error has left the tree in
 292       --  a state where the pragma should not be processed.
 293
 294       Arg_Count : Nat;
 295       --  Number of pragma argument associations
 296
 297       Arg1 : Node_Id;
 298       Arg2 : Node_Id;
 299       Arg3 : Node_Id;
 300       Arg4 : Node_Id;
 301       --  First four pragma arguments (pragma argument association nodes, or
 302       --  Empty if the corresponding argument does not exist).
 303
 304       type Name_List is array (Natural range <>) of Name_Id;
 305       type Args_List is array (Natural range <>) of Node_Id;
 306       --  Types used for arguments to Check_Arg_Order and Gather_Associations
 307
 308       procedure Ada_2005_Pragma;
 309       --  Called for pragmas defined in Ada 2005, that are not in Ada 95. In
 310       --  Ada 95 mode, these are implementation defined pragmas, so should be
 311       --  caught by the No_Implementation_Pragmas restriction
 312
 313       procedure Check_Ada_83_Warning;
 314       --  Issues a warning message for the current pragma if operating in Ada
 315       --  83 mode (used for language pragmas that are not a standard part of
 316       --  Ada 83). This procedure does not raise Error_Pragma. Also notes use
 317       --  of 95 pragma.
 318
 319       procedure Check_Arg_Count (Required : Nat);
 320       --  Check argument count for pragma is equal to given parameter. If not,
 321       --  then issue an error message and raise Pragma_Exit.
 322
 323       --  Note: all routines whose name is Check_Arg_Is_xxx take an argument
 324       --  Arg which can either be a pragma argument association, in which case
 325       --  the check is applied to the expression of the association or an
 326       --  expression directly.
 327
 328       procedure Check_Arg_Is_External_Name (Arg : Node_Id);
 329       --  Check that an argument has the right form for an EXTERNAL_NAME
 330       --  parameter of an extended import/export pragma. The rule is that the
 331       --  name must be an identifier or string literal (in Ada 83 mode) or a
 332       --  static string expression (in Ada 95 mode).
 333
 334       procedure Check_Arg_Is_Identifier (Arg : Node_Id);
 335       --  Check the specified argument Arg to make sure that it is an
 336       --  identifier. If not give error and raise Pragma_Exit.
 337
 338       procedure Check_Arg_Is_Integer_Literal (Arg : Node_Id);
 339       --  Check the specified argument Arg to make sure that it is an integer
 340       --  literal. If not give error and raise Pragma_Exit.
 341
 342       procedure Check_Arg_Is_Library_Level_Local_Name (Arg : Node_Id);
 343       --  Check the specified argument Arg to make sure that it has the proper
 344       --  syntactic form for a local name and meets the semantic requirements
 345       --  for a local name. The local name is analyzed as part of the
 346       --  processing for this call. In addition, the local name is required
 347       --  to represent an entity at the library level.
 348
 349       procedure Check_Arg_Is_Local_Name (Arg : Node_Id);
 350       --  Check the specified argument Arg to make sure that it has the proper
 351       --  syntactic form for a local name and meets the semantic requirements
 352       --  for a local name. The local name is analyzed as part of the
 353       --  processing for this call.
 354
 355       procedure Check_Arg_Is_Locking_Policy (Arg : Node_Id);
 356       --  Check the specified argument Arg to make sure that it is a valid
 357       --  locking policy name. If not give error and raise Pragma_Exit.
 358
 359       procedure Check_Arg_Is_One_Of (Arg : Node_Id; N1, N2 : Name_Id);
 360       procedure Check_Arg_Is_One_Of (Arg : Node_Id; N1, N2, N3 : Name_Id);
 361       procedure Check_Arg_Is_One_Of (Arg : Node_Id; N1, N2, N3, N4 : Name_Id);
 362       --  Check the specified argument Arg to make sure that it is an
 363       --  identifier whose name matches either N1 or N2 (or N3 if present).
 364       --  If not then give error and raise Pragma_Exit.
 365
 366       procedure Check_Arg_Is_Queuing_Policy (Arg : Node_Id);
 367       --  Check the specified argument Arg to make sure that it is a valid
 368       --  queuing policy name. If not give error and raise Pragma_Exit.
 369
 370       procedure Check_Arg_Is_Static_Expression
 371         (Arg : Node_Id;
 372          Typ : Entity_Id := Empty);
 373       --  Check the specified argument Arg to make sure that it is a static
 374       --  expression of the given type (i.e. it will be analyzed and resolved
 375       --  using this type, which can be any valid argument to Resolve, e.g.
 376       --  Any_Integer is OK). If not, given error and raise Pragma_Exit. If
 377       --  Typ is left Empty, then any static expression is allowed.
 378
 379       procedure Check_Arg_Is_String_Literal (Arg : Node_Id);
 380       --  Check the specified argument Arg to make sure that it is a string
 381       --  literal. If not give error and raise Pragma_Exit
 382
 383       procedure Check_Arg_Is_Task_Dispatching_Policy (Arg : Node_Id);
 384       --  Check the specified argument Arg to make sure that it is a valid task
 385       --  dispatching policy name. If not give error and raise Pragma_Exit.
 386
 387       procedure Check_Arg_Order (Names : Name_List);
 388       --  Checks for an instance of two arguments with identifiers for the
 389       --  current pragma which are not in the sequence indicated by Names,
 390       --  and if so, generates a fatal message about bad order of arguments.
 391
 392       procedure Check_At_Least_N_Arguments (N : Nat);
 393       --  Check there are at least N arguments present
 394
 395       procedure Check_At_Most_N_Arguments (N : Nat);
 396       --  Check there are no more than N arguments present
 397
 398       procedure Check_Component (Comp : Node_Id);
 399       --  Examine Unchecked_Union component for correct use of per-object
 400       --  constrained subtypes, and for restrictions on finalizable components.
 401
 402       procedure Check_Duplicated_Export_Name (Nam : Node_Id);
 403       --  Nam is an N_String_Literal node containing the external name set by
 404       --  an Import or Export pragma (or extended Import or Export pragma).
 405       --  This procedure checks for possible duplications if this is the export
 406       --  case, and if found, issues an appropriate error message.
 407
 408       procedure Check_First_Subtype (Arg : Node_Id);
 409       --  Checks that Arg, whose expression is an entity name referencing a
 410       --  subtype, does not reference a type that is not a first subtype.
 411
 412       procedure Check_In_Main_Program;
 413       --  Common checks for pragmas that appear within a main program
 414       --  (Priority, Main_Storage, Time_Slice, Relative_Deadline).
 415
 416       procedure Check_Interrupt_Or_Attach_Handler;
 417       --  Common processing for first argument of pragma Interrupt_Handler or
 418       --  pragma Attach_Handler.
 419
 420       procedure Check_Is_In_Decl_Part_Or_Package_Spec;
 421       --  Check that pragma appears in a declarative part, or in a package
 422       --  specification, i.e. that it does not occur in a statement sequence
 423       --  in a body.
 424
 425       procedure Check_No_Identifier (Arg : Node_Id);
 426       --  Checks that the given argument does not have an identifier. If
 427       --  an identifier is present, then an error message is issued, and
 428       --  Pragma_Exit is raised.
 429
 430       procedure Check_No_Identifiers;
 431       --  Checks that none of the arguments to the pragma has an identifier.
 432       --  If any argument has an identifier, then an error message is issued,
 433       --  and Pragma_Exit is raised.
 434
 435       procedure Check_Optional_Identifier (Arg : Node_Id; Id : Name_Id);
 436       --  Checks if the given argument has an identifier, and if so, requires
 437       --  it to match the given identifier name. If there is a non-matching
 438       --  identifier, then an error message is given and Error_Pragmas raised.
 439
 440       procedure Check_Optional_Identifier (Arg : Node_Id; Id : String);
 441       --  Checks if the given argument has an identifier, and if so, requires
 442       --  it to match the given identifier name. If there is a non-matching
 443       --  identifier, then an error message is given and Error_Pragmas raised.
 444       --  In this version of the procedure, the identifier name is given as
 445       --  a string with lower case letters.
 446
 447       procedure Check_Precondition_Postcondition (In_Body : out Boolean);
 448       --  Called to process a precondition or postcondition pragma. There are
 449       --  three cases:
 450       --
 451       --    The pragma appears after a subprogram spec
 452       --
 453       --      If the corresponding check is not enabled, the pragma is analyzed
 454       --      but otherwise ignored and control returns with In_Body set False.
 455       --
 456       --      If the check is enabled, then the first step is to analyze the
 457       --      pragma, but this is skipped if the subprogram spec appears within
 458       --      a package specification (because this is the case where we delay
 459       --      analysis till the end of the spec). Then (whether or not it was
 460       --      analyzed), the pragma is chained to the subprogram in question
 461       --      (using Spec_PPC_List and Next_Pragma) and control returns to the
 462       --      caller with In_Body set False.
 463       --
 464       --    The pragma appears at the start of subprogram body declarations
 465       --
 466       --      In this case an immediate return to the caller is made with
 467       --      In_Body set True, and the pragma is NOT analyzed.
 468       --
 469       --    In all other cases, an error message for bad placement is given
 470
 471       procedure Check_Static_Constraint (Constr : Node_Id);
 472       --  Constr is a constraint from an N_Subtype_Indication node from a
 473       --  component constraint in an Unchecked_Union type. This routine checks
 474       --  that the constraint is static as required by the restrictions for
 475       --  Unchecked_Union.
 476
 477       procedure Check_Valid_Configuration_Pragma;
 478       --  Legality checks for placement of a configuration pragma
 479
 480       procedure Check_Valid_Library_Unit_Pragma;
 481       --  Legality checks for library unit pragmas. A special case arises for
 482       --  pragmas in generic instances that come from copies of the original
 483       --  library unit pragmas in the generic templates. In the case of other
 484       --  than library level instantiations these can appear in contexts which
 485       --  would normally be invalid (they only apply to the original template
 486       --  and to library level instantiations), and they are simply ignored,
 487       --  which is implemented by rewriting them as null statements.
 488
 489       procedure Check_Variant (Variant : Node_Id);
 490       --  Check Unchecked_Union variant for lack of nested variants and
 491       --  presence of at least one component.
 492
 493       procedure Error_Pragma (Msg : String);
 494       pragma No_Return (Error_Pragma);
 495       --  Outputs error message for current pragma. The message contains a %
 496       --  that will be replaced with the pragma name, and the flag is placed
 497       --  on the pragma itself. Pragma_Exit is then raised.
 498
 499       procedure Error_Pragma_Arg (Msg : String; Arg : Node_Id);
 500       pragma No_Return (Error_Pragma_Arg);
 501       --  Outputs error message for current pragma. The message may contain
 502       --  a % that will be replaced with the pragma name. The parameter Arg
 503       --  may either be a pragma argument association, in which case the flag
 504       --  is placed on the expression of this association, or an expression,
 505       --  in which case the flag is placed directly on the expression. The
 506       --  message is placed using Error_Msg_N, so the message may also contain
 507       --  an & insertion character which will reference the given Arg value.
 508       --  After placing the message, Pragma_Exit is raised.
 509
 510       procedure Error_Pragma_Arg (Msg1, Msg2 : String; Arg : Node_Id);
 511       pragma No_Return (Error_Pragma_Arg);
 512       --  Similar to above form of Error_Pragma_Arg except that two messages
 513       --  are provided, the second is a continuation comment starting with \.
 514
 515       procedure Error_Pragma_Arg_Ident (Msg : String; Arg : Node_Id);
 516       pragma No_Return (Error_Pragma_Arg_Ident);
 517       --  Outputs error message for current pragma. The message may contain
 518       --  a % that will be replaced with the pragma name. The parameter Arg
 519       --  must be a pragma argument association with a non-empty identifier
 520       --  (i.e. its Chars field must be set), and the error message is placed
 521       --  on the identifier. The message is placed using Error_Msg_N so
 522       --  the message may also contain an & insertion character which will
 523       --  reference the identifier. After placing the message, Pragma_Exit
 524       --  is raised.
 525
 526       procedure Error_Pragma_Ref (Msg : String; Ref : Entity_Id);
 527       pragma No_Return (Error_Pragma_Ref);
 528       --  Outputs error message for current pragma. The message may contain
 529       --  a % that will be replaced with the pragma name. The parameter Ref
 530       --  must be an entity whose name can be referenced by & and sloc by #.
 531       --  After placing the message, Pragma_Exit is raised.
 532
 533       function Find_Lib_Unit_Name return Entity_Id;
 534       --  Used for a library unit pragma to find the entity to which the
 535       --  library unit pragma applies, returns the entity found.
 536
 537       procedure Find_Program_Unit_Name (Id : Node_Id);
 538       --  If the pragma is a compilation unit pragma, the id must denote the
 539       --  compilation unit in the same compilation, and the pragma must appear
 540       --  in the list of preceding or trailing pragmas. If it is a program
 541       --  unit pragma that is not a compilation unit pragma, then the
 542       --  identifier must be visible.
 543
 544       function Find_Unique_Parameterless_Procedure
 545         (Name : Entity_Id;
 546          Arg  : Node_Id) return Entity_Id;
 547       --  Used for a procedure pragma to find the unique parameterless
 548       --  procedure identified by Name, returns it if it exists, otherwise
 549       --  errors out and uses Arg as the pragma argument for the message.
 550
 551       procedure Gather_Associations
 552         (Names : Name_List;
 553          Args  : out Args_List);
 554       --  This procedure is used to gather the arguments for a pragma that
 555       --  permits arbitrary ordering of parameters using the normal rules
 556       --  for named and positional parameters. The Names argument is a list
 557       --  of Name_Id values that corresponds to the allowed pragma argument
 558       --  association identifiers in order. The result returned in Args is
 559       --  a list of corresponding expressions that are the pragma arguments.
 560       --  Note that this is a list of expressions, not of pragma argument
 561       --  associations (Gather_Associations has completely checked all the
 562       --  optional identifiers when it returns). An entry in Args is Empty
 563       --  on return if the corresponding argument is not present.
 564
 565       procedure GNAT_Pragma;
 566       --  Called for all GNAT defined pragmas to check the relevant restriction
 567       --  (No_Implementation_Pragmas).
 568
 569       function Is_Before_First_Decl
 570         (Pragma_Node : Node_Id;
 571          Decls       : List_Id) return Boolean;
 572       --  Return True if Pragma_Node is before the first declarative item in
 573       --  Decls where Decls is the list of declarative items.
 574
 575       function Is_Configuration_Pragma return Boolean;
 576       --  Determines if the placement of the current pragma is appropriate
 577       --  for a configuration pragma.
 578
 579       function Is_In_Context_Clause return Boolean;
 580       --  Returns True if pragma appears within the context clause of a unit,
 581       --  and False for any other placement (does not generate any messages).
 582
 583       function Is_Static_String_Expression (Arg : Node_Id) return Boolean;
 584       --  Analyzes the argument, and determines if it is a static string
 585       --  expression, returns True if so, False if non-static or not String.
 586
 587       procedure Pragma_Misplaced;
 588       pragma No_Return (Pragma_Misplaced);
 589       --  Issue fatal error message for misplaced pragma
 590
 591       procedure Process_Atomic_Shared_Volatile;
 592       --  Common processing for pragmas Atomic, Shared, Volatile. Note that
 593       --  Shared is an obsolete Ada 83 pragma, treated as being identical
 594       --  in effect to pragma Atomic.
 595
 596       procedure Process_Compile_Time_Warning_Or_Error;
 597       --  Common processing for Compile_Time_Error and Compile_Time_Warning
 598
 599       procedure Process_Convention
 600         (C   : out Convention_Id;
 601          Ent : out Entity_Id);
 602       --  Common processing for Convention, Interface, Import and Export.
 603       --  Checks first two arguments of pragma, and sets the appropriate
 604       --  convention value in the specified entity or entities. On return
 605       --  C is the convention, Ent is the referenced entity.
 606
 607       procedure Process_Extended_Import_Export_Exception_Pragma
 608         (Arg_Internal : Node_Id;
 609          Arg_External : Node_Id;
 610          Arg_Form     : Node_Id;
 611          Arg_Code     : Node_Id);
 612       --  Common processing for the pragmas Import/Export_Exception. The three
 613       --  arguments correspond to the three named parameters of the pragma. An
 614       --  argument is empty if the corresponding parameter is not present in
 615       --  the pragma.
 616
 617       procedure Process_Extended_Import_Export_Object_Pragma
 618         (Arg_Internal : Node_Id;
 619          Arg_External : Node_Id;
 620          Arg_Size     : Node_Id);
 621       --  Common processing for the pragmas Import/Export_Object. The three
 622       --  arguments correspond to the three named parameters of the pragmas. An
 623       --  argument is empty if the corresponding parameter is not present in
 624       --  the pragma.
 625
 626       procedure Process_Extended_Import_Export_Internal_Arg
 627         (Arg_Internal : Node_Id := Empty);
 628       --  Common processing for all extended Import and Export pragmas. The
 629       --  argument is the pragma parameter for the Internal argument. If
 630       --  Arg_Internal is empty or inappropriate, an error message is posted.
 631       --  Otherwise, on normal return, the Entity_Field of Arg_Internal is
 632       --  set to identify the referenced entity.
 633
 634       procedure Process_Extended_Import_Export_Subprogram_Pragma
 635         (Arg_Internal                 : Node_Id;
 636          Arg_External                 : Node_Id;
 637          Arg_Parameter_Types          : Node_Id;
 638          Arg_Result_Type              : Node_Id := Empty;
 639          Arg_Mechanism                : Node_Id;
 640          Arg_Result_Mechanism         : Node_Id := Empty;
 641          Arg_First_Optional_Parameter : Node_Id := Empty);
 642       --  Common processing for all extended Import and Export pragmas applying
 643       --  to subprograms. The caller omits any arguments that do not apply to
 644       --  the pragma in question (for example, Arg_Result_Type can be non-Empty
 645       --  only in the Import_Function and Export_Function cases). The argument
 646       --  names correspond to the allowed pragma association identifiers.
 647
 648       procedure Process_Generic_List;
 649       --  Common processing for Share_Generic and Inline_Generic
 650
 651       procedure Process_Import_Or_Interface;
 652       --  Common processing for Import of Interface
 653
 654       procedure Process_Inline (Active : Boolean);
 655       --  Common processing for Inline and Inline_Always. The parameter
 656       --  indicates if the inline pragma is active, i.e. if it should actually
 657       --  cause inlining to occur.
 658
 659       procedure Process_Interface_Name
 660         (Subprogram_Def : Entity_Id;
 661          Ext_Arg        : Node_Id;
 662          Link_Arg       : Node_Id);
 663       --  Given the last two arguments of pragma Import, pragma Export, or
 664       --  pragma Interface_Name, performs validity checks and sets the
 665       --  Interface_Name field of the given subprogram entity to the
 666       --  appropriate external or link name, depending on the arguments given.
 667       --  Ext_Arg is always present, but Link_Arg may be missing. Note that
 668       --  Ext_Arg may represent the Link_Name if Link_Arg is missing, and
 669       --  appropriate named notation is used for Ext_Arg. If neither Ext_Arg
 670       --  nor Link_Arg is present, the interface name is set to the default
 671       --  from the subprogram name.
 672
 673       procedure Process_Interrupt_Or_Attach_Handler;
 674       --  Common processing for Interrupt and Attach_Handler pragmas
 675
 676       procedure Process_Restrictions_Or_Restriction_Warnings (Warn : Boolean);
 677       --  Common processing for Restrictions and Restriction_Warnings pragmas.
 678       --  Warn is True for Restriction_Warnings, or for Restrictions if the
 679       --  flag Treat_Restrictions_As_Warnings is set, and False if this flag
 680       --  is not set in the Restrictions case.
 681
 682       procedure Process_Suppress_Unsuppress (Suppress_Case : Boolean);
 683       --  Common processing for Suppress and Unsuppress. The boolean parameter
 684       --  Suppress_Case is True for the Suppress case, and False for the
 685       --  Unsuppress case.
 686
 687       procedure Set_Exported (E : Entity_Id; Arg : Node_Id);
 688       --  This procedure sets the Is_Exported flag for the given entity,
 689       --  checking that the entity was not previously imported. Arg is
 690       --  the argument that specified the entity. A check is also made
 691       --  for exporting inappropriate entities.
 692
 693       procedure Set_Extended_Import_Export_External_Name
 694         (Internal_Ent : Entity_Id;
 695          Arg_External : Node_Id);
 696       --  Common processing for all extended import export pragmas. The first
 697       --  argument, Internal_Ent, is the internal entity, which has already
 698       --  been checked for validity by the caller. Arg_External is from the
 699       --  Import or Export pragma, and may be null if no External parameter
 700       --  was present. If Arg_External is present and is a non-null string
 701       --  (a null string is treated as the default), then the Interface_Name
 702       --  field of Internal_Ent is set appropriately.
 703
 704       procedure Set_Imported (E : Entity_Id);
 705       --  This procedure sets the Is_Imported flag for the given entity,
 706       --  checking that it is not previously exported or imported.
 707
 708       procedure Set_Mechanism_Value (Ent : Entity_Id; Mech_Name : Node_Id);
 709       --  Mech is a parameter passing mechanism (see Import_Function syntax
 710       --  for MECHANISM_NAME). This routine checks that the mechanism argument
 711       --  has the right form, and if not issues an error message. If the
 712       --  argument has the right form then the Mechanism field of Ent is
 713       --  set appropriately.
 714
 715       procedure Set_Ravenscar_Profile (N : Node_Id);
 716       --  Activate the set of configuration pragmas and restrictions that make
 717       --  up the Ravenscar Profile. N is the corresponding pragma node, which
 718       --  is used for error messages on any constructs that violate the
 719       --  profile.
 720
 721       ---------------------
 722       -- Ada_2005_Pragma --
 723       ---------------------
 724
 725       procedure Ada_2005_Pragma is
 726       begin
 727          if Ada_Version <= Ada_95 then
 728             Check_Restriction (No_Implementation_Pragmas, N);
 729          end if;
 730       end Ada_2005_Pragma;
 731
 732       --------------------------
 733       -- Check_Ada_83_Warning --
 734       --------------------------
 735
 736       procedure Check_Ada_83_Warning is
 737       begin
 738          if Ada_Version = Ada_83 and then Comes_From_Source (N) then
 739             Error_Msg_N ("(Ada 83) pragma& is non-standard?", N);
 740          end if;
 741       end Check_Ada_83_Warning;
 742
 743       ---------------------
 744       -- Check_Arg_Count --
 745       ---------------------
 746
 747       procedure Check_Arg_Count (Required : Nat) is
 748       begin
 749          if Arg_Count /= Required then
 750             Error_Pragma ("wrong number of arguments for pragma%");
 751          end if;
 752       end Check_Arg_Count;
 753
 754       --------------------------------
 755       -- Check_Arg_Is_External_Name --
 756       --------------------------------
 757
 758       procedure Check_Arg_Is_External_Name (Arg : Node_Id) is
 759          Argx : constant Node_Id := Get_Pragma_Arg (Arg);
 760
 761       begin
 762          if Nkind (Argx) = N_Identifier then
 763             return;
 764
 765          else
 766             Analyze_And_Resolve (Argx, Standard_String);
 767
 768             if Is_OK_Static_Expression (Argx) then
 769                return;
 770
 771             elsif Etype (Argx) = Any_Type then
 772                raise Pragma_Exit;
 773
 774             --  An interesting special case, if we have a string literal and
 775             --  we are in Ada 83 mode, then we allow it even though it will
 776             --  not be flagged as static. This allows expected Ada 83 mode
 777             --  use of external names which are string literals, even though
 778             --  technically these are not static in Ada 83.
 779
 780             elsif Ada_Version = Ada_83
 781               and then Nkind (Argx) = N_String_Literal
 782             then
 783                return;
 784
 785             --  Static expression that raises Constraint_Error. This has
 786             --  already been flagged, so just exit from pragma processing.
 787
 788             elsif Is_Static_Expression (Argx) then
 789                raise Pragma_Exit;
 790
 791             --  Here we have a real error (non-static expression)
 792
 793             else
 794                Error_Msg_Name_1 := Pname;
 795                Flag_Non_Static_Expr
 796                  ("argument for pragma% must be a identifier or " &
 797                   "static string expression!", Argx);
 798                raise Pragma_Exit;
 799             end if;
 800          end if;
 801       end Check_Arg_Is_External_Name;
 802
 803       -----------------------------
 804       -- Check_Arg_Is_Identifier --
 805       -----------------------------
 806
 807       procedure Check_Arg_Is_Identifier (Arg : Node_Id) is
 808          Argx : constant Node_Id := Get_Pragma_Arg (Arg);
 809       begin
 810          if Nkind (Argx) /= N_Identifier then
 811             Error_Pragma_Arg
 812               ("argument for pragma% must be identifier", Argx);
 813          end if;
 814       end Check_Arg_Is_Identifier;
 815
 816       ----------------------------------
 817       -- Check_Arg_Is_Integer_Literal --
 818       ----------------------------------
 819
 820       procedure Check_Arg_Is_Integer_Literal (Arg : Node_Id) is
 821          Argx : constant Node_Id := Get_Pragma_Arg (Arg);
 822       begin
 823          if Nkind (Argx) /= N_Integer_Literal then
 824             Error_Pragma_Arg
 825               ("argument for pragma% must be integer literal", Argx);
 826          end if;
 827       end Check_Arg_Is_Integer_Literal;
 828
 829       -------------------------------------------
 830       -- Check_Arg_Is_Library_Level_Local_Name --
 831       -------------------------------------------
 832
 833       --  LOCAL_NAME ::=
 834       --    DIRECT_NAME
 835       --  | DIRECT_NAME'ATTRIBUTE_DESIGNATOR
 836       --  | library_unit_NAME
 837
 838       procedure Check_Arg_Is_Library_Level_Local_Name (Arg : Node_Id) is
 839       begin
 840          Check_Arg_Is_Local_Name (Arg);
 841
 842          if not Is_Library_Level_Entity (Entity (Expression (Arg)))
 843            and then Comes_From_Source (N)
 844          then
 845             Error_Pragma_Arg
 846               ("argument for pragma% must be library level entity", Arg);
 847          end if;
 848       end Check_Arg_Is_Library_Level_Local_Name;
 849
 850       -----------------------------
 851       -- Check_Arg_Is_Local_Name --
 852       -----------------------------
 853
 854       --  LOCAL_NAME ::=
 855       --    DIRECT_NAME
 856       --  | DIRECT_NAME'ATTRIBUTE_DESIGNATOR
 857       --  | library_unit_NAME
 858
 859       procedure Check_Arg_Is_Local_Name (Arg : Node_Id) is
 860          Argx : constant Node_Id := Get_Pragma_Arg (Arg);
 861
 862       begin
 863          Analyze (Argx);
 864
 865          if Nkind (Argx) not in N_Direct_Name
 866            and then (Nkind (Argx) /= N_Attribute_Reference
 867                       or else Present (Expressions (Argx))
 868                       or else Nkind (Prefix (Argx)) /= N_Identifier)
 869            and then (not Is_Entity_Name (Argx)
 870                       or else not Is_Compilation_Unit (Entity (Argx)))
 871          then
 872             Error_Pragma_Arg ("argument for pragma% must be local name", Argx);
 873          end if;
 874
 875          if Is_Entity_Name (Argx)
 876            and then Scope (Entity (Argx)) /= Current_Scope
 877          then
 878             Error_Pragma_Arg
 879               ("pragma% argument must be in same declarative part", Arg);
 880          end if;
 881       end Check_Arg_Is_Local_Name;
 882
 883       ---------------------------------
 884       -- Check_Arg_Is_Locking_Policy --
 885       ---------------------------------
 886
 887       procedure Check_Arg_Is_Locking_Policy (Arg : Node_Id) is
 888          Argx : constant Node_Id := Get_Pragma_Arg (Arg);
 889
 890       begin
 891          Check_Arg_Is_Identifier (Argx);
 892
 893          if not Is_Locking_Policy_Name (Chars (Argx)) then
 894             Error_Pragma_Arg
 895               ("& is not a valid locking policy name", Argx);
 896          end if;
 897       end Check_Arg_Is_Locking_Policy;
 898
 899       -------------------------
 900       -- Check_Arg_Is_One_Of --
 901       -------------------------
 902
 903       procedure Check_Arg_Is_One_Of (Arg : Node_Id; N1, N2 : Name_Id) is
 904          Argx : constant Node_Id := Get_Pragma_Arg (Arg);
 905
 906       begin
 907          Check_Arg_Is_Identifier (Argx);
 908
 909          if Chars (Argx) /= N1 and then Chars (Argx) /= N2 then
 910             Error_Msg_Name_2 := N1;
 911             Error_Msg_Name_3 := N2;
 912             Error_Pragma_Arg ("argument for pragma% must be% or%", Argx);
 913          end if;
 914       end Check_Arg_Is_One_Of;
 915
 916       procedure Check_Arg_Is_One_Of
 917         (Arg        : Node_Id;
 918          N1, N2, N3 : Name_Id)
 919       is
 920          Argx : constant Node_Id := Get_Pragma_Arg (Arg);
 921
 922       begin
 923          Check_Arg_Is_Identifier (Argx);
 924
 925          if Chars (Argx) /= N1
 926            and then Chars (Argx) /= N2
 927            and then Chars (Argx) /= N3
 928          then
 929             Error_Pragma_Arg ("invalid argument for pragma%", Argx);
 930          end if;
 931       end Check_Arg_Is_One_Of;
 932
 933       procedure Check_Arg_Is_One_Of
 934         (Arg            : Node_Id;
 935          N1, N2, N3, N4 : Name_Id)
 936       is
 937          Argx : constant Node_Id := Get_Pragma_Arg (Arg);
 938
 939       begin
 940          Check_Arg_Is_Identifier (Argx);
 941
 942          if Chars (Argx) /= N1
 943            and then Chars (Argx) /= N2
 944            and then Chars (Argx) /= N3
 945            and then Chars (Argx) /= N4
 946          then
 947             Error_Pragma_Arg ("invalid argument for pragma%", Argx);
 948          end if;
 949       end Check_Arg_Is_One_Of;
 950
 951       ---------------------------------
 952       -- Check_Arg_Is_Queuing_Policy --
 953       ---------------------------------
 954
 955       procedure Check_Arg_Is_Queuing_Policy (Arg : Node_Id) is
 956          Argx : constant Node_Id := Get_Pragma_Arg (Arg);
 957
 958       begin
 959          Check_Arg_Is_Identifier (Argx);
 960
 961          if not Is_Queuing_Policy_Name (Chars (Argx)) then
 962             Error_Pragma_Arg
 963               ("& is not a valid queuing policy name", Argx);
 964          end if;
 965       end Check_Arg_Is_Queuing_Policy;
 966
 967       ------------------------------------
 968       -- Check_Arg_Is_Static_Expression --
 969       ------------------------------------
 970
 971       procedure Check_Arg_Is_Static_Expression
 972         (Arg : Node_Id;
 973          Typ : Entity_Id := Empty)
 974       is
 975          Argx : constant Node_Id := Get_Pragma_Arg (Arg);
 976
 977       begin
 978          if Present (Typ) then
 979             Analyze_And_Resolve (Argx, Typ);
 980          else
 981             Analyze_And_Resolve (Argx);
 982          end if;
 983
 984          if Is_OK_Static_Expression (Argx) then
 985             return;
 986
 987          elsif Etype (Argx) = Any_Type then
 988             raise Pragma_Exit;
 989
 990          --  An interesting special case, if we have a string literal and we
 991          --  are in Ada 83 mode, then we allow it even though it will not be
 992          --  flagged as static. This allows the use of Ada 95 pragmas like
 993          --  Import in Ada 83 mode. They will of course be flagged with
 994          --  warnings as usual, but will not cause errors.
 995
 996          elsif Ada_Version = Ada_83
 997            and then Nkind (Argx) = N_String_Literal
 998          then
 999             return;
1000
1001          --  Static expression that raises Constraint_Error. This has already
1002          --  been flagged, so just exit from pragma processing.
1003
1004          elsif Is_Static_Expression (Argx) then
1005             raise Pragma_Exit;
1006
1007          --  Finally, we have a real error
1008
1009          else
1010             Error_Msg_Name_1 := Pname;
1011             Flag_Non_Static_Expr
1012               ("argument for pragma% must be a static expression!", Argx);
1013             raise Pragma_Exit;
1014          end if;
1015       end Check_Arg_Is_Static_Expression;
1016
1017       ---------------------------------
1018       -- Check_Arg_Is_String_Literal --
1019       ---------------------------------
1020
1021       procedure Check_Arg_Is_String_Literal (Arg : Node_Id) is
1022          Argx : constant Node_Id := Get_Pragma_Arg (Arg);
1023       begin
1024          if Nkind (Argx) /= N_String_Literal then
1025             Error_Pragma_Arg
1026               ("argument for pragma% must be string literal", Argx);
1027          end if;
1028       end Check_Arg_Is_String_Literal;
1029
1030       ------------------------------------------
1031       -- Check_Arg_Is_Task_Dispatching_Policy --
1032       ------------------------------------------
1033
1034       procedure Check_Arg_Is_Task_Dispatching_Policy (Arg : Node_Id) is
1035          Argx : constant Node_Id := Get_Pragma_Arg (Arg);
1036
1037       begin
1038          Check_Arg_Is_Identifier (Argx);
1039
1040          if not Is_Task_Dispatching_Policy_Name (Chars (Argx)) then
1041             Error_Pragma_Arg
1042               ("& is not a valid task dispatching policy name", Argx);
1043          end if;
1044       end Check_Arg_Is_Task_Dispatching_Policy;
1045
1046       ---------------------
1047       -- Check_Arg_Order --
1048       ---------------------
1049
1050       procedure Check_Arg_Order (Names : Name_List) is
1051          Arg : Node_Id;
1052
1053          Highest_So_Far : Natural := 0;
1054          --  Highest index in Names seen do far
1055
1056       begin
1057          Arg := Arg1;
1058          for J in 1 .. Arg_Count loop
1059             if Chars (Arg) /= No_Name then
1060                for K in Names'Range loop
1061                   if Chars (Arg) = Names (K) then
1062                      if K < Highest_So_Far then
1063                         Error_Msg_Name_1 := Pname;
1064                         Error_Msg_N
1065                           ("parameters out of order for pragma%", Arg);
1066                         Error_Msg_Name_1 := Names (K);
1067                         Error_Msg_Name_2 := Names (Highest_So_Far);
1068                         Error_Msg_N ("\% must appear before %", Arg);
1069                         raise Pragma_Exit;
1070
1071                      else
1072                         Highest_So_Far := K;
1073                      end if;
1074                   end if;
1075                end loop;
1076             end if;
1077
1078             Arg := Next (Arg);
1079          end loop;
1080       end Check_Arg_Order;
1081
1082       --------------------------------
1083       -- Check_At_Least_N_Arguments --
1084       --------------------------------
1085
1086       procedure Check_At_Least_N_Arguments (N : Nat) is
1087       begin
1088          if Arg_Count < N then
1089             Error_Pragma ("too few arguments for pragma%");
1090          end if;
1091       end Check_At_Least_N_Arguments;
1092
1093       -------------------------------
1094       -- Check_At_Most_N_Arguments --
1095       -------------------------------
1096
1097       procedure Check_At_Most_N_Arguments (N : Nat) is
1098          Arg : Node_Id;
1099       begin
1100          if Arg_Count > N then
1101             Arg := Arg1;
1102             for J in 1 .. N loop
1103                Next (Arg);
1104                Error_Pragma_Arg ("too many arguments for pragma%", Arg);
1105             end loop;
1106          end if;
1107       end Check_At_Most_N_Arguments;
1108
1109       ---------------------
1110       -- Check_Component --
1111       ---------------------
1112
1113       procedure Check_Component (Comp : Node_Id) is
1114       begin
1115          if Nkind (Comp) = N_Component_Declaration then
1116             declare
1117                Sindic : constant Node_Id :=
1118                           Subtype_Indication (Component_Definition (Comp));
1119                Typ    : constant Entity_Id :=
1120                           Etype (Defining_Identifier (Comp));
1121             begin
1122                if Nkind (Sindic) = N_Subtype_Indication then
1123
1124                   --  Ada 2005 (AI-216): If a component subtype is subject to
1125                   --  a per-object constraint, then the component type shall
1126                   --  be an Unchecked_Union.
1127
1128                   if Has_Per_Object_Constraint (Defining_Identifier (Comp))
1129                     and then
1130                       not Is_Unchecked_Union (Etype (Subtype_Mark (Sindic)))
1131                   then
1132                      Error_Msg_N ("component subtype subject to per-object" &
1133                        " constraint must be an Unchecked_Union", Comp);
1134                   end if;
1135                end if;
1136
1137                if Is_Controlled (Typ) then
1138                   Error_Msg_N
1139                    ("component of unchecked union cannot be controlled", Comp);
1140
1141                elsif Has_Task (Typ) then
1142                   Error_Msg_N
1143                    ("component of unchecked union cannot have tasks", Comp);
1144                end if;
1145             end;
1146          end if;
1147       end Check_Component;
1148
1149       ----------------------------------
1150       -- Check_Duplicated_Export_Name --
1151       ----------------------------------
1152
1153       procedure Check_Duplicated_Export_Name (Nam : Node_Id) is
1154          String_Val : constant String_Id := Strval (Nam);
1155
1156       begin
1157          --  We allow duplicated export names in CIL, as they are always
1158          --  enclosed in a namespace that differentiates them, and overloaded
1159          --  entities are supported by the VM.
1160
1161          if VM_Target = CLI_Target then
1162             return;
1163          end if;
1164
1165          --  We are only interested in the export case, and in the case of
1166          --  generics, it is the instance, not the template, that is the
1167          --  problem (the template will generate a warning in any case).
1168
1169          if not Inside_A_Generic
1170            and then (Prag_Id = Pragma_Export
1171                        or else
1172                      Prag_Id = Pragma_Export_Procedure
1173                        or else
1174                      Prag_Id = Pragma_Export_Valued_Procedure
1175                        or else
1176                      Prag_Id = Pragma_Export_Function)
1177          then
1178             for J in Externals.First .. Externals.Last loop
1179                if String_Equal (String_Val, Strval (Externals.Table (J))) then
1180                   Error_Msg_Sloc := Sloc (Externals.Table (J));
1181                   Error_Msg_N ("external name duplicates name given#", Nam);
1182                   exit;
1183                end if;
1184             end loop;
1185
1186             Externals.Append (Nam);
1187          end if;
1188       end Check_Duplicated_Export_Name;
1189
1190       -------------------------
1191       -- Check_First_Subtype --
1192       -------------------------
1193
1194       procedure Check_First_Subtype (Arg : Node_Id) is
1195          Argx : constant Node_Id := Get_Pragma_Arg (Arg);
1196       begin
1197          if not Is_First_Subtype (Entity (Argx)) then
1198             Error_Pragma_Arg
1199               ("pragma% cannot apply to subtype", Argx);
1200          end if;
1201       end Check_First_Subtype;
1202
1203       ---------------------------
1204       -- Check_In_Main_Program --
1205       ---------------------------
1206
1207       procedure Check_In_Main_Program is
1208          P : constant Node_Id := Parent (N);
1209
1210       begin
1211          --  Must be at in subprogram body
1212
1213          if Nkind (P) /= N_Subprogram_Body then
1214             Error_Pragma ("% pragma allowed only in subprogram");
1215
1216          --  Otherwise warn if obviously not main program
1217
1218          elsif Present (Parameter_Specifications (Specification (P)))
1219            or else not Is_Compilation_Unit (Defining_Entity (P))
1220          then
1221             Error_Msg_Name_1 := Pname;
1222             Error_Msg_N
1223               ("?pragma% is only effective in main program", N);
1224          end if;
1225       end Check_In_Main_Program;
1226
1227       ---------------------------------------
1228       -- Check_Interrupt_Or_Attach_Handler --
1229       ---------------------------------------
1230
1231       procedure Check_Interrupt_Or_Attach_Handler is
1232          Arg1_X : constant Node_Id := Expression (Arg1);
1233          Handler_Proc, Proc_Scope : Entity_Id;
1234
1235       begin
1236          Analyze (Arg1_X);
1237
1238          if Prag_Id = Pragma_Interrupt_Handler then
1239             Check_Restriction (No_Dynamic_Attachment, N);
1240          end if;
1241
1242          Handler_Proc := Find_Unique_Parameterless_Procedure (Arg1_X, Arg1);
1243          Proc_Scope := Scope (Handler_Proc);
1244
1245          --  On AAMP only, a pragma Interrupt_Handler is supported for
1246          --  nonprotected parameterless procedures.
1247
1248          if not AAMP_On_Target
1249            or else Prag_Id = Pragma_Attach_Handler
1250          then
1251             if Ekind (Proc_Scope) /= E_Protected_Type then
1252                Error_Pragma_Arg
1253                  ("argument of pragma% must be protected procedure", Arg1);
1254             end if;
1255
1256             if Parent (N) /= Protected_Definition (Parent (Proc_Scope)) then
1257                Error_Pragma ("pragma% must be in protected definition");
1258             end if;
1259          end if;
1260
1261          if not Is_Library_Level_Entity (Proc_Scope)
1262            or else (AAMP_On_Target
1263                      and then not Is_Library_Level_Entity (Handler_Proc))
1264          then
1265             Error_Pragma_Arg
1266               ("argument for pragma% must be library level entity", Arg1);
1267          end if;
1268       end Check_Interrupt_Or_Attach_Handler;
1269
1270       -------------------------------------------
1271       -- Check_Is_In_Decl_Part_Or_Package_Spec --
1272       -------------------------------------------
1273
1274       procedure Check_Is_In_Decl_Part_Or_Package_Spec is
1275          P : Node_Id;
1276
1277       begin
1278          P := Parent (N);
1279          loop
1280             if No (P) then
1281                exit;
1282
1283             elsif Nkind (P) = N_Handled_Sequence_Of_Statements then
1284                exit;
1285
1286             elsif Nkind_In (P, N_Package_Specification,
1287                                N_Block_Statement)
1288             then
1289                return;
1290
1291             --  Note: the following tests seem a little peculiar, because
1292             --  they test for bodies, but if we were in the statement part
1293             --  of the body, we would already have hit the handled statement
1294             --  sequence, so the only way we get here is by being in the
1295             --  declarative part of the body.
1296
1297             elsif Nkind_In (P, N_Subprogram_Body,
1298                                N_Package_Body,
1299                                N_Task_Body,
1300                                N_Entry_Body)
1301             then
1302                return;
1303             end if;
1304
1305             P := Parent (P);
1306          end loop;
1307
1308          Error_Pragma ("pragma% is not in declarative part or package spec");
1309       end Check_Is_In_Decl_Part_Or_Package_Spec;
1310
1311       -------------------------
1312       -- Check_No_Identifier --
1313       -------------------------
1314
1315       procedure Check_No_Identifier (Arg : Node_Id) is
1316       begin
1317          if Chars (Arg) /= No_Name then
1318             Error_Pragma_Arg_Ident
1319               ("pragma% does not permit identifier& here", Arg);
1320          end if;
1321       end Check_No_Identifier;
1322
1323       --------------------------
1324       -- Check_No_Identifiers --
1325       --------------------------
1326
1327       procedure Check_No_Identifiers is
1328          Arg_Node : Node_Id;
1329       begin
1330          if Arg_Count > 0 then
1331             Arg_Node := Arg1;
1332             while Present (Arg_Node) loop
1333                Check_No_Identifier (Arg_Node);
1334                Next (Arg_Node);
1335             end loop;
1336          end if;
1337       end Check_No_Identifiers;
1338
1339       -------------------------------
1340       -- Check_Optional_Identifier --
1341       -------------------------------
1342
1343       procedure Check_Optional_Identifier (Arg : Node_Id; Id : Name_Id) is
1344       begin
1345          if Present (Arg) and then Chars (Arg) /= No_Name then
1346             if Chars (Arg) /= Id then
1347                Error_Msg_Name_1 := Pname;
1348                Error_Msg_Name_2 := Id;
1349                Error_Msg_N ("pragma% argument expects identifier%", Arg);
1350                raise Pragma_Exit;
1351             end if;
1352          end if;
1353       end Check_Optional_Identifier;
1354
1355       procedure Check_Optional_Identifier (Arg : Node_Id; Id : String) is
1356       begin
1357          Name_Buffer (1 .. Id'Length) := Id;
1358          Name_Len := Id'Length;
1359          Check_Optional_Identifier (Arg, Name_Find);
1360       end Check_Optional_Identifier;
1361
1362       --------------------------------------
1363       -- Check_Precondition_Postcondition --
1364       --------------------------------------
1365
1366       procedure Check_Precondition_Postcondition (In_Body : out Boolean) is
1367          P  : Node_Id;
1368          PO : Node_Id;
1369
1370          procedure Chain_PPC (PO : Node_Id);
1371          --  If PO is a subprogram declaration node (or a generic subprogram
1372          --  declaration node), then the precondition/postcondition applies
1373          --  to this subprogram and the processing for the pragma is completed.
1374          --  Otherwise the pragma is misplaced.
1375
1376          ---------------
1377          -- Chain_PPC --
1378          ---------------
1379
1380          procedure Chain_PPC (PO : Node_Id) is
1381             S : Node_Id;
1382
1383          begin
1384             if not Nkind_In (PO, N_Subprogram_Declaration,
1385                                  N_Generic_Subprogram_Declaration)
1386             then
1387                Pragma_Misplaced;
1388             end if;
1389
1390             --  Here if we have subprogram or generic subprogram declaration
1391
1392             S := Defining_Unit_Name (Specification (PO));
1393
1394             --  Analyze the pragma unless it appears within a package spec,
1395             --  which is the case where we delay the analysis of the PPC until
1396             --  the end of the package declarations (for details, see
1397             --  Analyze_Package_Specification.Analyze_PPCs).
1398
1399             if not Is_Package_Or_Generic_Package (Scope (S)) then
1400                Analyze_PPC_In_Decl_Part (N, S);
1401             end if;
1402
1403             --  Chain spec PPC pragma to list for subprogram
1404
1405             Set_Next_Pragma (N, Spec_PPC_List (S));
1406             Set_Spec_PPC_List (S, N);
1407
1408             --  Return indicating spec case
1409
1410             In_Body := False;
1411             return;
1412          end Chain_PPC;
1413
1414          --  Start of processing for Check_Precondition_Postcondition
1415
1416       begin
1417          if not Is_List_Member (N) then
1418             Pragma_Misplaced;
1419          end if;
1420
1421          --  Record whether pragma is enabled
1422
1423          Set_PPC_Enabled (N, Check_Enabled (Pname));
1424
1425          --  If we are within an inlined body, the legality of the pragma
1426          --  has been checked already.
1427
1428          if In_Inlined_Body then
1429             In_Body := True;
1430             return;
1431          end if;
1432
1433          --  Search prior declarations
1434
1435          P := N;
1436          while Present (Prev (P)) loop
1437             P := Prev (P);
1438
1439             --  If the previous node is a generic subprogram, do not go to to
1440             --  the original node, which is the unanalyzed tree: we need to
1441             --  attach the pre/postconditions to the analyzed version at this
1442             --  point. They get propagated to the original tree when analyzing
1443             --  the corresponding body.
1444
1445             if Nkind (P) not in N_Generic_Declaration then
1446                PO := Original_Node (P);
1447             else
1448                PO := P;
1449             end if;
1450
1451             --  Skip past prior pragma
1452
1453             if Nkind (PO) = N_Pragma then
1454                null;
1455
1456             --  Skip stuff not coming from source
1457
1458             elsif not Comes_From_Source (PO) then
1459                null;
1460
1461             --  Only remaining possibility is subprogram declaration
1462
1463             else
1464                Chain_PPC (PO);
1465                return;
1466             end if;
1467          end loop;
1468
1469          --  If we fall through loop, pragma is at start of list, so see if it
1470          --  is at the start of declarations of a subprogram body.
1471
1472          if Nkind (Parent (N)) = N_Subprogram_Body
1473            and then List_Containing (N) = Declarations (Parent (N))
1474          then
1475             if Operating_Mode /= Generate_Code
1476               or else Inside_A_Generic
1477             then
1478
1479                --  Analyze expression in pragma, for correctness
1480                --  and for ASIS use.
1481
1482                Preanalyze_Spec_Expression
1483                  (Get_Pragma_Arg (Arg1), Standard_Boolean);
1484             end if;
1485
1486             In_Body := True;
1487             return;
1488
1489          --  See if it is in the pragmas after a library level subprogram
1490
1491          elsif Nkind (Parent (N)) = N_Compilation_Unit_Aux then
1492             Chain_PPC (Unit (Parent (Parent (N))));
1493             return;
1494          end if;
1495
1496          --  If we fall through, pragma was misplaced
1497
1498          Pragma_Misplaced;
1499       end Check_Precondition_Postcondition;
1500
1501       -----------------------------
1502       -- Check_Static_Constraint --
1503       -----------------------------
1504
1505       --  Note: for convenience in writing this procedure, in addition to
1506       --  the officially (i.e. by spec) allowed argument which is always a
1507       --  constraint, it also allows ranges and discriminant associations.
1508       --  Above is not clear ???
1509
1510       procedure Check_Static_Constraint (Constr : Node_Id) is
1511
1512          procedure Require_Static (E : Node_Id);
1513          --  Require given expression to be static expression
1514
1515          --------------------
1516          -- Require_Static --
1517          --------------------
1518
1519          procedure Require_Static (E : Node_Id) is
1520          begin
1521             if not Is_OK_Static_Expression (E) then
1522                Flag_Non_Static_Expr
1523                  ("non-static constraint not allowed in Unchecked_Union!", E);
1524                raise Pragma_Exit;
1525             end if;
1526          end Require_Static;
1527
1528       --  Start of processing for Check_Static_Constraint
1529
1530       begin
1531          case Nkind (Constr) is
1532             when N_Discriminant_Association =>
1533                Require_Static (Expression (Constr));
1534
1535             when N_Range =>
1536                Require_Static (Low_Bound (Constr));
1537                Require_Static (High_Bound (Constr));
1538
1539             when N_Attribute_Reference =>
1540                Require_Static (Type_Low_Bound  (Etype (Prefix (Constr))));
1541                Require_Static (Type_High_Bound (Etype (Prefix (Constr))));
1542
1543             when N_Range_Constraint =>
1544                Check_Static_Constraint (Range_Expression (Constr));
1545
1546             when N_Index_Or_Discriminant_Constraint =>
1547                declare
1548                   IDC : Entity_Id;
1549                begin
1550                   IDC := First (Constraints (Constr));
1551                   while Present (IDC) loop
1552                      Check_Static_Constraint (IDC);
1553                      Next (IDC);
1554                   end loop;
1555                end;
1556
1557             when others =>
1558                null;
1559          end case;
1560       end Check_Static_Constraint;
1561
1562       --------------------------------------
1563       -- Check_Valid_Configuration_Pragma --
1564       --------------------------------------
1565
1566       --  A configuration pragma must appear in the context clause of a
1567       --  compilation unit, and only other pragmas may precede it. Note that
1568       --  the test also allows use in a configuration pragma file.
1569
1570       procedure Check_Valid_Configuration_Pragma is
1571       begin
1572          if not Is_Configuration_Pragma then
1573             Error_Pragma ("incorrect placement for configuration pragma%");
1574          end if;
1575       end Check_Valid_Configuration_Pragma;
1576
1577       -------------------------------------
1578       -- Check_Valid_Library_Unit_Pragma --
1579       -------------------------------------
1580
1581       procedure Check_Valid_Library_Unit_Pragma is
1582          Plist       : List_Id;
1583          Parent_Node : Node_Id;
1584          Unit_Name   : Entity_Id;
1585          Unit_Kind   : Node_Kind;
1586          Unit_Node   : Node_Id;
1587          Sindex      : Source_File_Index;
1588
1589       begin
1590          if not Is_List_Member (N) then
1591             Pragma_Misplaced;
1592
1593          else
1594             Plist := List_Containing (N);
1595             Parent_Node := Parent (Plist);
1596
1597             if Parent_Node = Empty then
1598                Pragma_Misplaced;
1599
1600             --  Case of pragma appearing after a compilation unit. In this case
1601             --  it must have an argument with the corresponding name and must
1602             --  be part of the following pragmas of its parent.
1603
1604             elsif Nkind (Parent_Node) = N_Compilation_Unit_Aux then
1605                if Plist /= Pragmas_After (Parent_Node) then
1606                   Pragma_Misplaced;
1607
1608                elsif Arg_Count = 0 then
1609                   Error_Pragma
1610                     ("argument required if outside compilation unit");
1611
1612                else
1613                   Check_No_Identifiers;
1614                   Check_Arg_Count (1);
1615                   Unit_Node := Unit (Parent (Parent_Node));
1616                   Unit_Kind := Nkind (Unit_Node);
1617
1618                   Analyze (Expression (Arg1));
1619
1620                   if Unit_Kind = N_Generic_Subprogram_Declaration
1621                     or else Unit_Kind = N_Subprogram_Declaration
1622                   then
1623                      Unit_Name := Defining_Entity (Unit_Node);
1624
1625                   elsif Unit_Kind in N_Generic_Instantiation then
1626                      Unit_Name := Defining_Entity (Unit_Node);
1627
1628                   else
1629                      Unit_Name := Cunit_Entity (Current_Sem_Unit);
1630                   end if;
1631
1632                   if Chars (Unit_Name) /=
1633                      Chars (Entity (Expression (Arg1)))
1634                   then
1635                      Error_Pragma_Arg
1636                        ("pragma% argument is not current unit name", Arg1);
1637                   end if;
1638
1639                   if Ekind (Unit_Name) = E_Package
1640                     and then Present (Renamed_Entity (Unit_Name))
1641                   then
1642                      Error_Pragma ("pragma% not allowed for renamed package");
1643                   end if;
1644                end if;
1645
1646             --  Pragma appears other than after a compilation unit
1647
1648             else
1649                --  Here we check for the generic instantiation case and also
1650                --  for the case of processing a generic formal package. We
1651                --  detect these cases by noting that the Sloc on the node
1652                --  does not belong to the current compilation unit.
1653
1654                Sindex := Source_Index (Current_Sem_Unit);
1655
1656                if Loc not in Source_First (Sindex) .. Source_Last (Sindex) then
1657                   Rewrite (N, Make_Null_Statement (Loc));
1658                   return;
1659
1660                --  If before first declaration, the pragma applies to the
1661                --  enclosing unit, and the name if present must be this name.
1662
1663                elsif Is_Before_First_Decl (N, Plist) then
1664                   Unit_Node := Unit_Declaration_Node (Current_Scope);
1665                   Unit_Kind := Nkind (Unit_Node);
1666
1667                   if Nkind (Parent (Unit_Node)) /= N_Compilation_Unit then
1668                      Pragma_Misplaced;
1669
1670                   elsif Unit_Kind = N_Subprogram_Body
1671                     and then not Acts_As_Spec (Unit_Node)
1672                   then
1673                      Pragma_Misplaced;
1674
1675                   elsif Nkind (Parent_Node) = N_Package_Body then
1676                      Pragma_Misplaced;
1677
1678                   elsif Nkind (Parent_Node) = N_Package_Specification
1679                     and then Plist = Private_Declarations (Parent_Node)
1680                   then
1681                      Pragma_Misplaced;
1682
1683                   elsif (Nkind (Parent_Node) = N_Generic_Package_Declaration
1684                            or else Nkind (Parent_Node) =
1685                                              N_Generic_Subprogram_Declaration)
1686                     and then Plist = Generic_Formal_Declarations (Parent_Node)
1687                   then
1688                      Pragma_Misplaced;
1689
1690                   elsif Arg_Count > 0 then
1691                      Analyze (Expression (Arg1));
1692
1693                      if Entity (Expression (Arg1)) /= Current_Scope then
1694                         Error_Pragma_Arg
1695                           ("name in pragma% must be enclosing unit", Arg1);
1696                      end if;
1697
1698                   --  It is legal to have no argument in this context
1699
1700                   else
1701                      return;
1702                   end if;
1703
1704                --  Error if not before first declaration. This is because a
1705                --  library unit pragma argument must be the name of a library
1706                --  unit (RM 10.1.5(7)), but the only names permitted in this
1707                --  context are (RM 10.1.5(6)) names of subprogram declarations,
1708                --  generic subprogram declarations or generic instantiations.
1709
1710                else
1711                   Error_Pragma
1712                     ("pragma% misplaced, must be before first declaration");
1713                end if;
1714             end if;
1715          end if;
1716       end Check_Valid_Library_Unit_Pragma;
1717
1718       -------------------
1719       -- Check_Variant --
1720       -------------------
1721
1722       procedure Check_Variant (Variant : Node_Id) is
1723          Clist : constant Node_Id := Component_List (Variant);
1724          Comp  : Node_Id;
1725
1726       begin
1727          if not Is_Non_Empty_List (Component_Items (Clist)) then
1728             Error_Msg_N
1729               ("Unchecked_Union may not have empty component list",
1730                Variant);
1731             return;
1732          end if;
1733
1734          Comp := First (Component_Items (Clist));
1735          while Present (Comp) loop
1736             Check_Component (Comp);
1737             Next (Comp);
1738          end loop;
1739       end Check_Variant;
1740
1741       ------------------
1742       -- Error_Pragma --
1743       ------------------
1744
1745       procedure Error_Pragma (Msg : String) is
1746       begin
1747          Error_Msg_Name_1 := Pname;
1748          Error_Msg_N (Msg, N);
1749          raise Pragma_Exit;
1750       end Error_Pragma;
1751
1752       ----------------------
1753       -- Error_Pragma_Arg --
1754       ----------------------
1755
1756       procedure Error_Pragma_Arg (Msg : String; Arg : Node_Id) is
1757       begin
1758          Error_Msg_Name_1 := Pname;
1759          Error_Msg_N (Msg, Get_Pragma_Arg (Arg));
1760          raise Pragma_Exit;
1761       end Error_Pragma_Arg;
1762
1763       procedure Error_Pragma_Arg (Msg1, Msg2 : String; Arg : Node_Id) is
1764       begin
1765          Error_Msg_Name_1 := Pname;
1766          Error_Msg_N (Msg1, Get_Pragma_Arg (Arg));
1767          Error_Pragma_Arg (Msg2, Arg);
1768       end Error_Pragma_Arg;
1769
1770       ----------------------------
1771       -- Error_Pragma_Arg_Ident --
1772       ----------------------------
1773
1774       procedure Error_Pragma_Arg_Ident (Msg : String; Arg : Node_Id) is
1775       begin
1776          Error_Msg_Name_1 := Pname;
1777          Error_Msg_N (Msg, Arg);
1778          raise Pragma_Exit;
1779       end Error_Pragma_Arg_Ident;
1780
1781       ----------------------
1782       -- Error_Pragma_Ref --
1783       ----------------------
1784
1785       procedure Error_Pragma_Ref (Msg : String; Ref : Entity_Id) is
1786       begin
1787          Error_Msg_Name_1 := Pname;
1788          Error_Msg_Sloc   := Sloc (Ref);
1789          Error_Msg_NE (Msg, N, Ref);
1790          raise Pragma_Exit;
1791       end Error_Pragma_Ref;
1792
1793       ------------------------
1794       -- Find_Lib_Unit_Name --
1795       ------------------------
1796
1797       function Find_Lib_Unit_Name return Entity_Id is
1798       begin
1799          --  Return inner compilation unit entity, for case of nested
1800          --  categorization pragmas. This happens in generic unit.
1801
1802          if Nkind (Parent (N)) = N_Package_Specification
1803            and then Defining_Entity (Parent (N)) /= Current_Scope
1804          then
1805             return Defining_Entity (Parent (N));
1806          else
1807             return Current_Scope;
1808          end if;
1809       end Find_Lib_Unit_Name;
1810
1811       ----------------------------
1812       -- Find_Program_Unit_Name --
1813       ----------------------------
1814
1815       procedure Find_Program_Unit_Name (Id : Node_Id) is
1816          Unit_Name : Entity_Id;
1817          Unit_Kind : Node_Kind;
1818          P         : constant Node_Id := Parent (N);
1819
1820       begin
1821          if Nkind (P) = N_Compilation_Unit then
1822             Unit_Kind := Nkind (Unit (P));
1823
1824             if Unit_Kind = N_Subprogram_Declaration
1825               or else Unit_Kind = N_Package_Declaration
1826               or else Unit_Kind in N_Generic_Declaration
1827             then
1828                Unit_Name := Defining_Entity (Unit (P));
1829
1830                if Chars (Id) = Chars (Unit_Name) then
1831                   Set_Entity (Id, Unit_Name);
1832                   Set_Etype (Id, Etype (Unit_Name));
1833                else
1834                   Set_Etype (Id, Any_Type);
1835                   Error_Pragma
1836                     ("cannot find program unit referenced by pragma%");
1837                end if;
1838
1839             else
1840                Set_Etype (Id, Any_Type);
1841                Error_Pragma ("pragma% inapplicable to this unit");
1842             end if;
1843
1844          else
1845             Analyze (Id);
1846          end if;
1847       end Find_Program_Unit_Name;
1848
1849       -----------------------------------------
1850       -- Find_Unique_Parameterless_Procedure --
1851       -----------------------------------------
1852
1853       function Find_Unique_Parameterless_Procedure
1854         (Name : Entity_Id;
1855          Arg  : Node_Id) return Entity_Id
1856       is
1857          Proc : Entity_Id := Empty;
1858
1859       begin
1860          --  The body of this procedure needs some comments ???
1861
1862          if not Is_Entity_Name (Name) then
1863             Error_Pragma_Arg
1864               ("argument of pragma% must be entity name", Arg);
1865
1866          elsif not Is_Overloaded (Name) then
1867             Proc := Entity (Name);
1868
1869             if Ekind (Proc) /= E_Procedure
1870                  or else Present (First_Formal (Proc)) then
1871                Error_Pragma_Arg
1872                  ("argument of pragma% must be parameterless procedure", Arg);
1873             end if;
1874
1875          else
1876             declare
1877                Found : Boolean := False;
1878                It    : Interp;
1879                Index : Interp_Index;
1880
1881             begin
1882                Get_First_Interp (Name, Index, It);
1883                while Present (It.Nam) loop
1884                   Proc := It.Nam;
1885
1886                   if Ekind (Proc) = E_Procedure
1887                     and then No (First_Formal (Proc))
1888                   then
1889                      if not Found then
1890                         Found := True;
1891                         Set_Entity (Name, Proc);
1892                         Set_Is_Overloaded (Name, False);
1893                      else
1894                         Error_Pragma_Arg
1895                           ("ambiguous handler name for pragma% ", Arg);
1896                      end if;
1897                   end if;
1898
1899                   Get_Next_Interp (Index, It);
1900                end loop;
1901
1902                if not Found then
1903                   Error_Pragma_Arg
1904                     ("argument of pragma% must be parameterless procedure",
1905                      Arg);
1906                else
1907                   Proc := Entity (Name);
1908                end if;
1909             end;
1910          end if;
1911
1912          return Proc;
1913       end Find_Unique_Parameterless_Procedure;
1914
1915       -------------------------
1916       -- Gather_Associations --
1917       -------------------------
1918
1919       procedure Gather_Associations
1920         (Names : Name_List;
1921          Args  : out Args_List)
1922       is
1923          Arg : Node_Id;
1924
1925       begin
1926          --  Initialize all parameters to Empty
1927
1928          for J in Args'Range loop
1929             Args (J) := Empty;
1930          end loop;
1931
1932          --  That's all we have to do if there are no argument associations
1933
1934          if No (Pragma_Argument_Associations (N)) then
1935             return;
1936          end if;
1937
1938          --  Otherwise first deal with any positional parameters present
1939
1940          Arg := First (Pragma_Argument_Associations (N));
1941          for Index in Args'Range loop
1942             exit when No (Arg) or else Chars (Arg) /= No_Name;
1943             Args (Index) := Expression (Arg);
1944             Next (Arg);
1945          end loop;
1946
1947          --  Positional parameters all processed, if any left, then we
1948          --  have too many positional parameters.
1949
1950          if Present (Arg) and then Chars (Arg) = No_Name then
1951             Error_Pragma_Arg
1952               ("too many positional associations for pragma%", Arg);
1953          end if;
1954
1955          --  Process named parameters if any are present
1956
1957          while Present (Arg) loop
1958             if Chars (Arg) = No_Name then
1959                Error_Pragma_Arg
1960                  ("positional association cannot follow named association",
1961                   Arg);
1962
1963             else
1964                for Index in Names'Range loop
1965                   if Names (Index) = Chars (Arg) then
1966                      if Present (Args (Index)) then
1967                         Error_Pragma_Arg
1968                           ("duplicate argument association for pragma%", Arg);
1969                      else
1970                         Args (Index) := Expression (Arg);
1971                         exit;
1972                      end if;
1973                   end if;
1974
1975                   if Index = Names'Last then
1976                      Error_Msg_Name_1 := Pname;
1977                      Error_Msg_N ("pragma% does not allow & argument", Arg);
1978
1979                      --  Check for possible misspelling
1980
1981                      for Index1 in Names'Range loop
1982                         if Is_Bad_Spelling_Of
1983                              (Chars (Arg), Names (Index1))
1984                         then
1985                            Error_Msg_Name_1 := Names (Index1);
1986                            Error_Msg_N -- CODEFIX
1987                              ("\possible misspelling of%", Arg);
1988                            exit;
1989                         end if;
1990                      end loop;
1991
1992                      raise Pragma_Exit;
1993                   end if;
1994                end loop;
1995             end if;
1996
1997             Next (Arg);
1998          end loop;
1999       end Gather_Associations;
2000
2001       -----------------
2002       -- GNAT_Pragma --
2003       -----------------
2004
2005       procedure GNAT_Pragma is
2006       begin
2007          Check_Restriction (No_Implementation_Pragmas, N);
2008       end GNAT_Pragma;
2009
2010       --------------------------
2011       -- Is_Before_First_Decl --
2012       --------------------------
2013
2014       function Is_Before_First_Decl
2015         (Pragma_Node : Node_Id;
2016          Decls       : List_Id) return Boolean
2017       is
2018          Item : Node_Id := First (Decls);
2019
2020       begin
2021          --  Only other pragmas can come before this pragma
2022
2023          loop
2024             if No (Item) or else Nkind (Item) /= N_Pragma then
2025                return False;
2026
2027             elsif Item = Pragma_Node then
2028                return True;
2029             end if;
2030
2031             Next (Item);
2032          end loop;
2033       end Is_Before_First_Decl;
2034
2035       -----------------------------
2036       -- Is_Configuration_Pragma --
2037       -----------------------------
2038
2039       --  A configuration pragma must appear in the context clause of a
2040       --  compilation unit, and only other pragmas may precede it. Note that
2041       --  the test below also permits use in a configuration pragma file.
2042
2043       function Is_Configuration_Pragma return Boolean is
2044          Lis : constant List_Id := List_Containing (N);
2045          Par : constant Node_Id := Parent (N);
2046          Prg : Node_Id;
2047
2048       begin
2049          --  If no parent, then we are in the configuration pragma file,
2050          --  so the placement is definitely appropriate.
2051
2052          if No (Par) then
2053             return True;
2054
2055          --  Otherwise we must be in the context clause of a compilation unit
2056          --  and the only thing allowed before us in the context list is more
2057          --  configuration pragmas.
2058
2059          elsif Nkind (Par) = N_Compilation_Unit
2060            and then Context_Items (Par) = Lis
2061          then
2062             Prg := First (Lis);
2063
2064             loop
2065                if Prg = N then
2066                   return True;
2067                elsif Nkind (Prg) /= N_Pragma then
2068                   return False;
2069                end if;
2070
2071                Next (Prg);
2072             end loop;
2073
2074          else
2075             return False;
2076          end if;
2077       end Is_Configuration_Pragma;
2078
2079       --------------------------
2080       -- Is_In_Context_Clause --
2081       --------------------------
2082
2083       function Is_In_Context_Clause return Boolean is
2084          Plist       : List_Id;
2085          Parent_Node : Node_Id;
2086
2087       begin
2088          if not Is_List_Member (N) then
2089             return False;
2090
2091          else
2092             Plist := List_Containing (N);
2093             Parent_Node := Parent (Plist);
2094
2095             if Parent_Node = Empty
2096               or else Nkind (Parent_Node) /= N_Compilation_Unit
2097               or else Context_Items (Parent_Node) /= Plist
2098             then
2099                return False;
2100             end if;
2101          end if;
2102
2103          return True;
2104       end Is_In_Context_Clause;
2105
2106       ---------------------------------
2107       -- Is_Static_String_Expression --
2108       ---------------------------------
2109
2110       function Is_Static_String_Expression (Arg : Node_Id) return Boolean is
2111          Argx : constant Node_Id := Get_Pragma_Arg (Arg);
2112
2113       begin
2114          Analyze_And_Resolve (Argx);
2115          return Is_OK_Static_Expression (Argx)
2116            and then Nkind (Argx) = N_String_Literal;
2117       end Is_Static_String_Expression;
2118
2119       ----------------------
2120       -- Pragma_Misplaced --
2121       ----------------------
2122
2123       procedure Pragma_Misplaced is
2124       begin
2125          Error_Pragma ("incorrect placement of pragma%");
2126       end Pragma_Misplaced;
2127
2128       ------------------------------------
2129       -- Process Atomic_Shared_Volatile --
2130       ------------------------------------
2131
2132       procedure Process_Atomic_Shared_Volatile is
2133          E_Id : Node_Id;
2134          E    : Entity_Id;
2135          D    : Node_Id;
2136          K    : Node_Kind;
2137          Utyp : Entity_Id;
2138
2139          procedure Set_Atomic (E : Entity_Id);
2140          --  Set given type as atomic, and if no explicit alignment was given,
2141          --  set alignment to unknown, since back end knows what the alignment
2142          --  requirements are for atomic arrays. Note: this step is necessary
2143          --  for derived types.
2144
2145          ----------------
2146          -- Set_Atomic --
2147          ----------------
2148
2149          procedure Set_Atomic (E : Entity_Id) is
2150          begin
2151             Set_Is_Atomic (E);
2152
2153             if not Has_Alignment_Clause (E) then
2154                Set_Alignment (E, Uint_0);
2155             end if;
2156          end Set_Atomic;
2157
2158       --  Start of processing for Process_Atomic_Shared_Volatile
2159
2160       begin
2161          Check_Ada_83_Warning;
2162          Check_No_Identifiers;
2163          Check_Arg_Count (1);
2164          Check_Arg_Is_Local_Name (Arg1);
2165          E_Id := Expression (Arg1);
2166
2167          if Etype (E_Id) = Any_Type then
2168             return;
2169          end if;
2170
2171          E := Entity (E_Id);
2172          D := Declaration_Node (E);
2173          K := Nkind (D);
2174
2175          if Is_Type (E) then
2176             if Rep_Item_Too_Early (E, N)
2177                  or else
2178                Rep_Item_Too_Late (E, N)
2179             then
2180                return;
2181             else
2182                Check_First_Subtype (Arg1);
2183             end if;
2184
2185             if Prag_Id /= Pragma_Volatile then
2186                Set_Atomic (E);
2187                Set_Atomic (Underlying_Type (E));
2188                Set_Atomic (Base_Type (E));
2189             end if;
2190
2191             --  Attribute belongs on the base type. If the view of the type is
2192             --  currently private, it also belongs on the underlying type.
2193
2194             Set_Is_Volatile (Base_Type (E));
2195             Set_Is_Volatile (Underlying_Type (E));
2196
2197             Set_Treat_As_Volatile (E);
2198             Set_Treat_As_Volatile (Underlying_Type (E));
2199
2200          elsif K = N_Object_Declaration
2201            or else (K = N_Component_Declaration
2202                      and then Original_Record_Component (E) = E)
2203          then
2204             if Rep_Item_Too_Late (E, N) then
2205                return;
2206             end if;
2207
2208             if Prag_Id /= Pragma_Volatile then
2209                Set_Is_Atomic (E);
2210
2211                --  If the object declaration has an explicit initialization, a
2212                --  temporary may have to be created to hold the expression, to
2213                --  ensure that access to the object remain atomic.
2214
2215                if Nkind (Parent (E)) = N_Object_Declaration
2216                  and then Present (Expression (Parent (E)))
2217                then
2218                   Set_Has_Delayed_Freeze (E);
2219                end if;
2220
2221                --  An interesting improvement here. If an object of type X is
2222                --  declared atomic, and the type X is not atomic, that's a
2223                --  pity, since it may not have appropriate alignment etc. We
2224                --  can rescue this in the special case where the object and
2225                --  type are in the same unit by just setting the type as
2226                --  atomic, so that the back end will process it as atomic.
2227
2228                Utyp := Underlying_Type (Etype (E));
2229
2230                if Present (Utyp)
2231                  and then Sloc (E) > No_Location
2232                  and then Sloc (Utyp) > No_Location
2233                  and then
2234                    Get_Source_File_Index (Sloc (E)) =
2235                    Get_Source_File_Index (Sloc (Underlying_Type (Etype (E))))
2236                then
2237                   Set_Is_Atomic (Underlying_Type (Etype (E)));
2238                end if;
2239             end if;
2240
2241             Set_Is_Volatile (E);
2242             Set_Treat_As_Volatile (E);
2243
2244          else
2245             Error_Pragma_Arg
2246               ("inappropriate entity for pragma%", Arg1);
2247          end if;
2248       end Process_Atomic_Shared_Volatile;
2249
2250       -------------------------------------------
2251       -- Process_Compile_Time_Warning_Or_Error --
2252       -------------------------------------------
2253
2254       procedure Process_Compile_Time_Warning_Or_Error is
2255          Arg1x : constant Node_Id := Get_Pragma_Arg (Arg1);
2256
2257       begin
2258          Check_Arg_Count (2);
2259          Check_No_Identifiers;
2260          Check_Arg_Is_Static_Expression (Arg2, Standard_String);
2261          Analyze_And_Resolve (Arg1x, Standard_Boolean);
2262
2263          if Compile_Time_Known_Value (Arg1x) then
2264             if Is_True (Expr_Value (Get_Pragma_Arg (Arg1))) then
2265                declare
2266                   Str   : constant String_Id :=
2267                             Strval (Get_Pragma_Arg (Arg2));
2268                   Len   : constant Int := String_Length (Str);
2269                   Cont  : Boolean;
2270                   Ptr   : Nat;
2271                   CC    : Char_Code;
2272                   C     : Character;
2273                   Cent  : constant Entity_Id :=
2274                             Cunit_Entity (Current_Sem_Unit);
2275
2276                   Force : constant Boolean :=
2277                             Prag_Id = Pragma_Compile_Time_Warning
2278                               and then
2279                                 Is_Spec_Name (Unit_Name (Current_Sem_Unit))
2280                               and then (Ekind (Cent) /= E_Package
2281                                           or else not In_Private_Part (Cent));
2282                   --  Set True if this is the warning case, and we are in the
2283                   --  visible part of a package spec, or in a subprogram spec,
2284                   --  in which case we want to force the client to see the
2285                   --  warning, even though it is not in the main unit.
2286
2287                begin
2288                   --  Loop through segments of message separated by line feeds.
2289                   --  We output these segments as separate messages with
2290                   --  continuation marks for all but the first.
2291
2292                   Cont := False;
2293                   Ptr := 1;
2294                   loop
2295                      Error_Msg_Strlen := 0;
2296
2297                      --  Loop to copy characters from argument to error message
2298                      --  string buffer.
2299
2300                      loop
2301                         exit when Ptr > Len;
2302                         CC := Get_String_Char (Str, Ptr);
2303                         Ptr := Ptr + 1;
2304
2305                         --  Ignore wide chars ??? else store character
2306
2307                         if In_Character_Range (CC) then
2308                            C := Get_Character (CC);
2309                            exit when C = ASCII.LF;
2310                            Error_Msg_Strlen := Error_Msg_Strlen + 1;
2311                            Error_Msg_String (Error_Msg_Strlen) := C;
2312                         end if;
2313                      end loop;
2314
2315                      --  Here with one line ready to go
2316
2317                      Error_Msg_Warn := Prag_Id = Pragma_Compile_Time_Warning;
2318
2319                      --  If this is a warning in a spec, then we want clients
2320                      --  to see the warning, so mark the message with the
2321                      --  special sequence !! to force the warning. In the case
2322                      --  of a package spec, we do not force this if we are in
2323                      --  the private part of the spec.
2324
2325                      if Force then
2326                         if Cont = False then
2327                            Error_Msg_N ("<~!!", Arg1);
2328                            Cont := True;
2329                         else
2330                            Error_Msg_N ("\<~!!", Arg1);
2331                         end if;
2332
2333                      --  Error, rather than warning, or in a body, so we do not
2334                      --  need to force visibility for client (error will be
2335                      --  output in any case, and this is the situation in which
2336                      --  we do not want a client to get a warning, since the
2337                      --  warning is in the body or the spec private part.
2338
2339                      else
2340                         if Cont = False then
2341                            Error_Msg_N ("<~", Arg1);
2342                            Cont := True;
2343                         else
2344                            Error_Msg_N ("\<~", Arg1);
2345                         end if;
2346                      end if;
2347
2348                      exit when Ptr > Len;
2349                   end loop;
2350                end;
2351             end if;
2352          end if;
2353       end Process_Compile_Time_Warning_Or_Error;
2354
2355       ------------------------
2356       -- Process_Convention --
2357       ------------------------
2358
2359       procedure Process_Convention
2360         (C   : out Convention_Id;
2361          Ent : out Entity_Id)
2362       is
2363          Id        : Node_Id;
2364          E         : Entity_Id;
2365          E1        : Entity_Id;
2366          Cname     : Name_Id;
2367          Comp_Unit : Unit_Number_Type;
2368
2369          procedure Set_Convention_From_Pragma (E : Entity_Id);
2370          --  Set convention in entity E, and also flag that the entity has a
2371          --  convention pragma. If entity is for a private or incomplete type,
2372          --  also set convention and flag on underlying type. This procedure
2373          --  also deals with the special case of C_Pass_By_Copy convention.
2374
2375          --------------------------------
2376          -- Set_Convention_From_Pragma --
2377          --------------------------------
2378
2379          procedure Set_Convention_From_Pragma (E : Entity_Id) is
2380          begin
2381             --  Ada 2005 (AI-430): Check invalid attempt to change convention
2382             --  for an overridden dispatching operation. Technically this is
2383             --  an amendment and should only be done in Ada 2005 mode. However,
2384             --  this is clearly a mistake, since the problem that is addressed
2385             --  by this AI is that there is a clear gap in the RM!
2386
2387             if Is_Dispatching_Operation (E)
2388               and then Present (Overridden_Operation (E))
2389               and then C /= Convention (Overridden_Operation (E))
2390             then
2391                Error_Pragma_Arg
2392                  ("cannot change convention for " &
2393                   "overridden dispatching operation",
2394                   Arg1);
2395             end if;
2396
2397             --  Set the convention
2398
2399             Set_Convention (E, C);
2400             Set_Has_Convention_Pragma (E);
2401
2402             if Is_Incomplete_Or_Private_Type (E) then
2403                Set_Convention            (Underlying_Type (E), C);
2404                Set_Has_Convention_Pragma (Underlying_Type (E), True);
2405             end if;
2406
2407             --  A class-wide type should inherit the convention of the specific
2408             --  root type (although this isn't specified clearly by the RM).
2409
2410             if Is_Type (E) and then Present (Class_Wide_Type (E)) then
2411                Set_Convention (Class_Wide_Type (E), C);
2412             end if;
2413
2414             --  If the entity is a record type, then check for special case of
2415             --  C_Pass_By_Copy, which is treated the same as C except that the
2416             --  special record flag is set. This convention is only permitted
2417             --  on record types (see AI95-00131).
2418
2419             if Cname = Name_C_Pass_By_Copy then
2420                if Is_Record_Type (E) then
2421                   Set_C_Pass_By_Copy (Base_Type (E));
2422                elsif Is_Incomplete_Or_Private_Type (E)
2423                  and then Is_Record_Type (Underlying_Type (E))
2424                then
2425                   Set_C_Pass_By_Copy (Base_Type (Underlying_Type (E)));
2426                else
2427                   Error_Pragma_Arg
2428                     ("C_Pass_By_Copy convention allowed only for record type",
2429                      Arg2);
2430                end if;
2431             end if;
2432
2433             --  If the entity is a derived boolean type, check for the special
2434             --  case of convention C, C++, or Fortran, where we consider any
2435             --  nonzero value to represent true.
2436
2437             if Is_Discrete_Type (E)
2438               and then Root_Type (Etype (E)) = Standard_Boolean
2439               and then
2440                 (C = Convention_C
2441                    or else
2442                  C = Convention_CPP
2443                    or else
2444                  C = Convention_Fortran)
2445             then
2446                Set_Nonzero_Is_True (Base_Type (E));
2447             end if;
2448          end Set_Convention_From_Pragma;
2449
2450       --  Start of processing for Process_Convention
2451
2452       begin
2453          Check_At_Least_N_Arguments (2);
2454          Check_Optional_Identifier (Arg1, Name_Convention);
2455          Check_Arg_Is_Identifier (Arg1);
2456          Cname := Chars (Expression (Arg1));
2457
2458          --  C_Pass_By_Copy is treated as a synonym for convention C (this is
2459          --  tested again below to set the critical flag).
2460          if Cname = Name_C_Pass_By_Copy then
2461             C := Convention_C;
2462
2463          --  Otherwise we must have something in the standard convention list
2464
2465          elsif Is_Convention_Name (Cname) then
2466             C := Get_Convention_Id (Chars (Expression (Arg1)));
2467
2468          --  In DEC VMS, it seems that there is an undocumented feature that
2469          --  any unrecognized convention is treated as the default, which for
2470          --  us is convention C. It does not seem so terrible to do this
2471          --  unconditionally, silently in the VMS case, and with a warning
2472          --  in the non-VMS case.
2473
2474          else
2475             if Warn_On_Export_Import and not OpenVMS_On_Target then
2476                Error_Msg_N
2477                  ("?unrecognized convention name, C assumed",
2478                   Expression (Arg1));
2479             end if;
2480
2481             C := Convention_C;
2482          end if;
2483
2484          Check_Optional_Identifier (Arg2, Name_Entity);
2485          Check_Arg_Is_Local_Name (Arg2);
2486
2487          Id := Expression (Arg2);
2488          Analyze (Id);
2489
2490          if not Is_Entity_Name (Id) then
2491             Error_Pragma_Arg ("entity name required", Arg2);
2492          end if;
2493
2494          E := Entity (Id);
2495
2496          --  Set entity to return
2497
2498          Ent := E;
2499
2500          --  Go to renamed subprogram if present, since convention applies to
2501          --  the actual renamed entity, not to the renaming entity. If the
2502          --  subprogram is inherited, go to parent subprogram.
2503
2504          if Is_Subprogram (E)
2505            and then Present (Alias (E))
2506          then
2507             if Nkind (Parent (Declaration_Node (E))) =
2508                                        N_Subprogram_Renaming_Declaration
2509             then
2510                if Scope (E) /= Scope (Alias (E)) then
2511                   Error_Pragma_Ref
2512                     ("cannot apply pragma% to non-local entity&#", E);
2513                end if;
2514
2515                E := Alias (E);
2516
2517             elsif Nkind_In (Parent (E), N_Full_Type_Declaration,
2518                                         N_Private_Extension_Declaration)
2519               and then Scope (E) = Scope (Alias (E))
2520             then
2521                E := Alias (E);
2522
2523                --  Return the parent subprogram the entity was inherited from
2524
2525                Ent := E;
2526             end if;
2527          end if;
2528
2529          --  Check that we are not applying this to a specless body
2530
2531          if Is_Subprogram (E)
2532            and then Nkind (Parent (Declaration_Node (E))) = N_Subprogram_Body
2533          then
2534             Error_Pragma
2535               ("pragma% requires separate spec and must come before body");
2536          end if;
2537
2538          --  Check that we are not applying this to a named constant
2539
2540          if Ekind (E) = E_Named_Integer
2541               or else
2542             Ekind (E) = E_Named_Real
2543          then
2544             Error_Msg_Name_1 := Pname;
2545             Error_Msg_N
2546               ("cannot apply pragma% to named constant!",
2547                Get_Pragma_Arg (Arg2));
2548             Error_Pragma_Arg
2549               ("\supply appropriate type for&!", Arg2);
2550          end if;
2551
2552          if Ekind (E) = E_Enumeration_Literal then
2553             Error_Pragma ("enumeration literal not allowed for pragma%");
2554          end if;
2555
2556          --  Check for rep item appearing too early or too late
2557
2558          if Etype (E) = Any_Type
2559            or else Rep_Item_Too_Early (E, N)
2560          then
2561             raise Pragma_Exit;
2562          else
2563             E := Underlying_Type (E);
2564          end if;
2565
2566          if Rep_Item_Too_Late (E, N) then
2567             raise Pragma_Exit;
2568          end if;
2569
2570          if Has_Convention_Pragma (E) then
2571             Error_Pragma_Arg
2572               ("at most one Convention/Export/Import pragma is allowed", Arg2);
2573
2574          elsif Convention (E) = Convention_Protected
2575            or else Ekind (Scope (E)) = E_Protected_Type
2576          then
2577             Error_Pragma_Arg
2578               ("a protected operation cannot be given a different convention",
2579                 Arg2);
2580          end if;
2581
2582          --  For Intrinsic, a subprogram is required
2583
2584          if C = Convention_Intrinsic
2585            and then not Is_Subprogram (E)
2586            and then not Is_Generic_Subprogram (E)
2587          then
2588             Error_Pragma_Arg
2589               ("second argument of pragma% must be a subprogram", Arg2);
2590          end if;
2591
2592          --  For Stdcall, a subprogram, variable or subprogram type is required
2593
2594          if C = Convention_Stdcall
2595            and then not Is_Subprogram (E)
2596            and then not Is_Generic_Subprogram (E)
2597            and then Ekind (E) /= E_Variable
2598            and then not
2599              (Is_Access_Type (E)
2600                 and then Ekind (Designated_Type (E)) = E_Subprogram_Type)
2601          then
2602             Error_Pragma_Arg
2603               ("second argument of pragma% must be subprogram (type)",
2604                Arg2);
2605          end if;
2606
2607          if not Is_Subprogram (E)
2608            and then not Is_Generic_Subprogram (E)
2609          then
2610             Set_Convention_From_Pragma (E);
2611
2612             if Is_Type (E) then
2613
2614                Check_First_Subtype (Arg2);
2615                Set_Convention_From_Pragma (Base_Type (E));
2616
2617                --  For subprograms, we must set the convention on the
2618                --  internally generated directly designated type as well.
2619
2620                if Ekind (E) = E_Access_Subprogram_Type then
2621                   Set_Convention_From_Pragma (Directly_Designated_Type (E));
2622                end if;
2623             end if;
2624
2625          --  For the subprogram case, set proper convention for all homonyms
2626          --  in same scope and the same declarative part, i.e. the same
2627          --  compilation unit.
2628
2629          else
2630             Comp_Unit := Get_Source_Unit (E);
2631             Set_Convention_From_Pragma (E);
2632
2633             --  Treat a pragma Import as an implicit body, for GPS use
2634
2635             if Prag_Id = Pragma_Import then
2636                Generate_Reference (E, Id, 'b');
2637             end if;
2638
2639             --  Loop through the homonyms of the pragma argument's entity
2640
2641             E1 := Ent;
2642             loop
2643                E1 := Homonym (E1);
2644                exit when No (E1) or else Scope (E1) /= Current_Scope;
2645
2646                --  Do not set the pragma on inherited operations or on formal
2647                --  subprograms.
2648
2649                if Comes_From_Source (E1)
2650                  and then Comp_Unit = Get_Source_Unit (E1)
2651                  and then not Is_Formal_Subprogram (E1)
2652                  and then Nkind (Original_Node (Parent (E1))) /=
2653                                                     N_Full_Type_Declaration
2654                then
2655                   if Present (Alias (E1))
2656                     and then Scope (E1) /= Scope (Alias (E1))
2657                   then
2658                      Error_Pragma_Ref
2659                        ("cannot apply pragma% to non-local entity& declared#",
2660                         E1);
2661                   end if;
2662
2663                   Set_Convention_From_Pragma (E1);
2664
2665                   if Prag_Id = Pragma_Import then
2666                      Generate_Reference (E1, Id, 'b');
2667                   end if;
2668                end if;
2669             end loop;
2670          end if;
2671       end Process_Convention;
2672
2673       -----------------------------------------------------
2674       -- Process_Extended_Import_Export_Exception_Pragma --
2675       -----------------------------------------------------
2676
2677       procedure Process_Extended_Import_Export_Exception_Pragma
2678         (Arg_Internal : Node_Id;
2679          Arg_External : Node_Id;
2680          Arg_Form     : Node_Id;
2681          Arg_Code     : Node_Id)
2682       is
2683          Def_Id   : Entity_Id;
2684          Code_Val : Uint;
2685
2686       begin
2687          if not OpenVMS_On_Target then
2688             Error_Pragma
2689               ("?pragma% ignored (applies only to Open'V'M'S)");
2690          end if;
2691
2692          Process_Extended_Import_Export_Internal_Arg (Arg_Internal);
2693          Def_Id := Entity (Arg_Internal);
2694
2695          if Ekind (Def_Id) /= E_Exception then
2696             Error_Pragma_Arg
2697               ("pragma% must refer to declared exception", Arg_Internal);
2698          end if;
2699
2700          Set_Extended_Import_Export_External_Name (Def_Id, Arg_External);
2701
2702          if Present (Arg_Form) then
2703             Check_Arg_Is_One_Of (Arg_Form, Name_Ada, Name_VMS);
2704          end if;
2705
2706          if Present (Arg_Form)
2707            and then Chars (Arg_Form) = Name_Ada
2708          then
2709             null;
2710          else
2711             Set_Is_VMS_Exception (Def_Id);
2712             Set_Exception_Code (Def_Id, No_Uint);
2713          end if;
2714
2715          if Present (Arg_Code) then
2716             if not Is_VMS_Exception (Def_Id) then
2717                Error_Pragma_Arg
2718                  ("Code option for pragma% not allowed for Ada case",
2719                   Arg_Code);
2720             end if;
2721
2722             Check_Arg_Is_Static_Expression (Arg_Code, Any_Integer);
2723             Code_Val := Expr_Value (Arg_Code);
2724
2725             if not UI_Is_In_Int_Range (Code_Val) then
2726                Error_Pragma_Arg
2727                  ("Code option for pragma% must be in 32-bit range",
2728                   Arg_Code);
2729
2730             else
2731                Set_Exception_Code (Def_Id, Code_Val);
2732             end if;
2733          end if;
2734       end Process_Extended_Import_Export_Exception_Pragma;
2735
2736       -------------------------------------------------
2737       -- Process_Extended_Import_Export_Internal_Arg --
2738       -------------------------------------------------
2739
2740       procedure Process_Extended_Import_Export_Internal_Arg
2741         (Arg_Internal : Node_Id := Empty)
2742       is
2743       begin
2744          if No (Arg_Internal) then
2745             Error_Pragma ("Internal parameter required for pragma%");
2746          end if;
2747
2748          if Nkind (Arg_Internal) = N_Identifier then
2749             null;
2750
2751          elsif Nkind (Arg_Internal) = N_Operator_Symbol
2752            and then (Prag_Id = Pragma_Import_Function
2753                        or else
2754                      Prag_Id = Pragma_Export_Function)
2755          then
2756             null;
2757
2758          else
2759             Error_Pragma_Arg
2760               ("wrong form for Internal parameter for pragma%", Arg_Internal);
2761          end if;
2762
2763          Check_Arg_Is_Local_Name (Arg_Internal);
2764       end Process_Extended_Import_Export_Internal_Arg;
2765
2766       --------------------------------------------------
2767       -- Process_Extended_Import_Export_Object_Pragma --
2768       --------------------------------------------------
2769
2770       procedure Process_Extended_Import_Export_Object_Pragma
2771         (Arg_Internal : Node_Id;
2772          Arg_External : Node_Id;
2773          Arg_Size     : Node_Id)
2774       is
2775          Def_Id : Entity_Id;
2776
2777       begin
2778          Process_Extended_Import_Export_Internal_Arg (Arg_Internal);
2779          Def_Id := Entity (Arg_Internal);
2780
2781          if Ekind (Def_Id) /= E_Constant
2782            and then Ekind (Def_Id) /= E_Variable
2783          then
2784             Error_Pragma_Arg
2785               ("pragma% must designate an object", Arg_Internal);
2786          end if;
2787
2788          if Has_Rep_Pragma (Def_Id, Name_Common_Object)
2789               or else
2790             Has_Rep_Pragma (Def_Id, Name_Psect_Object)
2791          then
2792             Error_Pragma_Arg
2793               ("previous Common/Psect_Object applies, pragma % not permitted",
2794                Arg_Internal);
2795          end if;
2796
2797          if Rep_Item_Too_Late (Def_Id, N) then
2798             raise Pragma_Exit;
2799          end if;
2800
2801          Set_Extended_Import_Export_External_Name (Def_Id, Arg_External);
2802
2803          if Present (Arg_Size) then
2804             Check_Arg_Is_External_Name (Arg_Size);
2805          end if;
2806
2807          --  Export_Object case
2808
2809          if Prag_Id = Pragma_Export_Object then
2810             if not Is_Library_Level_Entity (Def_Id) then
2811                Error_Pragma_Arg
2812                  ("argument for pragma% must be library level entity",
2813                   Arg_Internal);
2814             end if;
2815
2816             if Ekind (Current_Scope) = E_Generic_Package then
2817                Error_Pragma ("pragma& cannot appear in a generic unit");
2818             end if;
2819
2820             if not Size_Known_At_Compile_Time (Etype (Def_Id)) then
2821                Error_Pragma_Arg
2822                  ("exported object must have compile time known size",
2823                   Arg_Internal);
2824             end if;
2825
2826             if Warn_On_Export_Import and then Is_Exported (Def_Id) then
2827                Error_Msg_N ("?duplicate Export_Object pragma", N);
2828             else
2829                Set_Exported (Def_Id, Arg_Internal);
2830             end if;
2831
2832          --  Import_Object case
2833
2834          else
2835             if Is_Concurrent_Type (Etype (Def_Id)) then
2836                Error_Pragma_Arg
2837                  ("cannot use pragma% for task/protected object",
2838                   Arg_Internal);
2839             end if;
2840
2841             if Ekind (Def_Id) = E_Constant then
2842                Error_Pragma_Arg
2843                  ("cannot import a constant", Arg_Internal);
2844             end if;
2845
2846             if Warn_On_Export_Import
2847               and then Has_Discriminants (Etype (Def_Id))
2848             then
2849                Error_Msg_N
2850                  ("imported value must be initialized?", Arg_Internal);
2851             end if;
2852
2853             if Warn_On_Export_Import
2854               and then Is_Access_Type (Etype (Def_Id))
2855             then
2856                Error_Pragma_Arg
2857                  ("cannot import object of an access type?", Arg_Internal);
2858             end if;
2859
2860             if Warn_On_Export_Import
2861               and then Is_Imported (Def_Id)
2862             then
2863                Error_Msg_N
2864                  ("?duplicate Import_Object pragma", N);
2865
2866             --  Check for explicit initialization present. Note that an
2867             --  initialization generated by the code generator, e.g. for an
2868             --  access type, does not count here.
2869
2870             elsif Present (Expression (Parent (Def_Id)))
2871                and then
2872                  Comes_From_Source
2873                    (Original_Node (Expression (Parent (Def_Id))))
2874             then
2875                Error_Msg_Sloc := Sloc (Def_Id);
2876                Error_Pragma_Arg
2877                  ("imported entities cannot be initialized (RM B.1(24))",
2878                   "\no initialization allowed for & declared#", Arg1);
2879             else
2880                Set_Imported (Def_Id);
2881                Note_Possible_Modification (Arg_Internal, Sure => False);
2882             end if;
2883          end if;
2884       end Process_Extended_Import_Export_Object_Pragma;
2885
2886       ------------------------------------------------------
2887       -- Process_Extended_Import_Export_Subprogram_Pragma --
2888       ------------------------------------------------------
2889
2890       procedure Process_Extended_Import_Export_Subprogram_Pragma
2891         (Arg_Internal                 : Node_Id;
2892          Arg_External                 : Node_Id;
2893          Arg_Parameter_Types          : Node_Id;
2894          Arg_Result_Type              : Node_Id := Empty;
2895          Arg_Mechanism                : Node_Id;
2896          Arg_Result_Mechanism         : Node_Id := Empty;
2897          Arg_First_Optional_Parameter : Node_Id := Empty)
2898       is
2899          Ent       : Entity_Id;
2900          Def_Id    : Entity_Id;
2901          Hom_Id    : Entity_Id;
2902          Formal    : Entity_Id;
2903          Ambiguous : Boolean;
2904          Match     : Boolean;
2905          Dval      : Node_Id;
2906
2907          function Same_Base_Type
2908           (Ptype  : Node_Id;
2909            Formal : Entity_Id) return Boolean;
2910          --  Determines if Ptype references the type of Formal. Note that only
2911          --  the base types need to match according to the spec. Ptype here is
2912          --  the argument from the pragma, which is either a type name, or an
2913          --  access attribute.
2914
2915          --------------------
2916          -- Same_Base_Type --
2917          --------------------
2918
2919          function Same_Base_Type
2920            (Ptype  : Node_Id;
2921             Formal : Entity_Id) return Boolean
2922          is
2923             Ftyp : constant Entity_Id := Base_Type (Etype (Formal));
2924             Pref : Node_Id;
2925
2926          begin
2927             --  Case where pragma argument is typ'Access
2928
2929             if Nkind (Ptype) = N_Attribute_Reference
2930               and then Attribute_Name (Ptype) = Name_Access
2931             then
2932                Pref := Prefix (Ptype);
2933                Find_Type (Pref);
2934
2935                if not Is_Entity_Name (Pref)
2936                  or else Entity (Pref) = Any_Type
2937                then
2938                   raise Pragma_Exit;
2939                end if;
2940
2941                --  We have a match if the corresponding argument is of an
2942                --  anonymous access type, and its designated type matches the
2943                --  type of the prefix of the access attribute
2944
2945                return Ekind (Ftyp) = E_Anonymous_Access_Type
2946                  and then Base_Type (Entity (Pref)) =
2947                             Base_Type (Etype (Designated_Type (Ftyp)));
2948
2949             --  Case where pragma argument is a type name
2950
2951             else
2952                Find_Type (Ptype);
2953
2954                if not Is_Entity_Name (Ptype)
2955                  or else Entity (Ptype) = Any_Type
2956                then
2957                   raise Pragma_Exit;
2958                end if;
2959
2960                --  We have a match if the corresponding argument is of the type
2961                --  given in the pragma (comparing base types)
2962
2963                return Base_Type (Entity (Ptype)) = Ftyp;
2964             end if;
2965          end Same_Base_Type;
2966
2967       --  Start of processing for
2968       --  Process_Extended_Import_Export_Subprogram_Pragma
2969
2970       begin
2971          Process_Extended_Import_Export_Internal_Arg (Arg_Internal);
2972          Ent := Empty;
2973          Ambiguous := False;
2974
2975          --  Loop through homonyms (overloadings) of the entity
2976
2977          Hom_Id := Entity (Arg_Internal);
2978          while Present (Hom_Id) loop
2979             Def_Id := Get_Base_Subprogram (Hom_Id);
2980
2981             --  We need a subprogram in the current scope
2982
2983             if not Is_Subprogram (Def_Id)
2984               or else Scope (Def_Id) /= Current_Scope
2985             then
2986                null;
2987
2988             else
2989                Match := True;
2990
2991                --  Pragma cannot apply to subprogram body
2992
2993                if Is_Subprogram (Def_Id)
2994                  and then Nkind (Parent (Declaration_Node (Def_Id))) =
2995                                                              N_Subprogram_Body
2996                then
2997                   Error_Pragma
2998                     ("pragma% requires separate spec"
2999                       & " and must come before body");
3000                end if;
3001
3002                --  Test result type if given, note that the result type
3003                --  parameter can only be present for the function cases.
3004
3005                if Present (Arg_Result_Type)
3006                  and then not Same_Base_Type (Arg_Result_Type, Def_Id)
3007                then
3008                   Match := False;
3009
3010                elsif Etype (Def_Id) /= Standard_Void_Type
3011                  and then
3012                    (Pname = Name_Export_Procedure
3013                       or else
3014                     Pname = Name_Import_Procedure)
3015                then
3016                   Match := False;
3017
3018                --  Test parameter types if given. Note that this parameter
3019                --  has not been analyzed (and must not be, since it is
3020                --  semantic nonsense), so we get it as the parser left it.
3021
3022                elsif Present (Arg_Parameter_Types) then
3023                   Check_Matching_Types : declare
3024                      Formal : Entity_Id;
3025                      Ptype  : Node_Id;
3026
3027                   begin
3028                      Formal := First_Formal (Def_Id);
3029
3030                      if Nkind (Arg_Parameter_Types) = N_Null then
3031                         if Present (Formal) then
3032                            Match := False;
3033                         end if;
3034
3035                      --  A list of one type, e.g. (List) is parsed as
3036                      --  a parenthesized expression.
3037
3038                      elsif Nkind (Arg_Parameter_Types) /= N_Aggregate
3039                        and then Paren_Count (Arg_Parameter_Types) = 1
3040                      then
3041                         if No (Formal)
3042                           or else Present (Next_Formal (Formal))
3043                         then
3044                            Match := False;
3045                         else
3046                            Match :=
3047                              Same_Base_Type (Arg_Parameter_Types, Formal);
3048                         end if;
3049
3050                      --  A list of more than one type is parsed as a aggregate
3051
3052                      elsif Nkind (Arg_Parameter_Types) = N_Aggregate
3053                        and then Paren_Count (Arg_Parameter_Types) = 0
3054                      then
3055                         Ptype := First (Expressions (Arg_Parameter_Types));
3056                         while Present (Ptype) or else Present (Formal) loop
3057                            if No (Ptype)
3058                              or else No (Formal)
3059                              or else not Same_Base_Type (Ptype, Formal)
3060                            then
3061                               Match := False;
3062                               exit;
3063                            else
3064                               Next_Formal (Formal);
3065                               Next (Ptype);
3066                            end if;
3067                         end loop;
3068
3069                      --  Anything else is of the wrong form
3070
3071                      else
3072                         Error_Pragma_Arg
3073                           ("wrong form for Parameter_Types parameter",
3074                            Arg_Parameter_Types);
3075                      end if;
3076                   end Check_Matching_Types;
3077                end if;
3078
3079                --  Match is now False if the entry we found did not match
3080                --  either a supplied Parameter_Types or Result_Types argument
3081
3082                if Match then
3083                   if No (Ent) then
3084                      Ent := Def_Id;
3085
3086                   --  Ambiguous case, the flag Ambiguous shows if we already
3087                   --  detected this and output the initial messages.
3088
3089                   else
3090                      if not Ambiguous then
3091                         Ambiguous := True;
3092                         Error_Msg_Name_1 := Pname;
3093                         Error_Msg_N
3094                           ("pragma% does not uniquely identify subprogram!",
3095                            N);
3096                         Error_Msg_Sloc := Sloc (Ent);
3097                         Error_Msg_N ("matching subprogram #!", N);
3098                         Ent := Empty;
3099                      end if;
3100
3101                      Error_Msg_Sloc := Sloc (Def_Id);
3102                      Error_Msg_N ("matching subprogram #!", N);
3103                   end if;
3104                end if;
3105             end if;
3106
3107             Hom_Id := Homonym (Hom_Id);
3108          end loop;
3109
3110          --  See if we found an entry
3111
3112          if No (Ent) then
3113             if not Ambiguous then
3114                if Is_Generic_Subprogram (Entity (Arg_Internal)) then
3115                   Error_Pragma
3116                     ("pragma% cannot be given for generic subprogram");
3117                else
3118                   Error_Pragma
3119                     ("pragma% does not identify local subprogram");
3120                end if;
3121             end if;
3122
3123             return;
3124          end if;
3125
3126          --  Import pragmas must be for imported entities
3127
3128          if Prag_Id = Pragma_Import_Function
3129               or else
3130             Prag_Id = Pragma_Import_Procedure
3131               or else
3132             Prag_Id = Pragma_Import_Valued_Procedure
3133          then
3134             if not Is_Imported (Ent) then
3135                Error_Pragma -- CODEFIX???
3136                  ("pragma Import or Interface must precede pragma%");
3137             end if;
3138
3139          --  Here we have the Export case which can set the entity as exported
3140
3141          --  But does not do so if the specified external name is null, since
3142          --  that is taken as a signal in DEC Ada 83 (with which we want to be
3143          --  compatible) to request no external name.
3144
3145          elsif Nkind (Arg_External) = N_String_Literal
3146            and then String_Length (Strval (Arg_External)) = 0
3147          then
3148             null;
3149
3150          --  In all other cases, set entity as exported
3151
3152          else
3153             Set_Exported (Ent, Arg_Internal);
3154          end if;
3155
3156          --  Special processing for Valued_Procedure cases
3157
3158          if Prag_Id = Pragma_Import_Valued_Procedure
3159            or else
3160             Prag_Id = Pragma_Export_Valued_Procedure
3161          then
3162             Formal := First_Formal (Ent);
3163
3164             if No (Formal) then
3165                Error_Pragma ("at least one parameter required for pragma%");
3166
3167             elsif Ekind (Formal) /= E_Out_Parameter then
3168                Error_Pragma ("first parameter must have mode out for pragma%");
3169
3170             else
3171                Set_Is_Valued_Procedure (Ent);
3172             end if;
3173          end if;
3174
3175          Set_Extended_Import_Export_External_Name (Ent, Arg_External);
3176
3177          --  Process Result_Mechanism argument if present. We have already
3178          --  checked that this is only allowed for the function case.
3179
3180          if Present (Arg_Result_Mechanism) then
3181             Set_Mechanism_Value (Ent, Arg_Result_Mechanism);
3182          end if;
3183
3184          --  Process Mechanism parameter if present. Note that this parameter
3185          --  is not analyzed, and must not be analyzed since it is semantic
3186          --  nonsense, so we get it in exactly as the parser left it.
3187
3188          if Present (Arg_Mechanism) then
3189             declare
3190                Formal : Entity_Id;
3191                Massoc : Node_Id;
3192                Mname  : Node_Id;
3193                Choice : Node_Id;
3194
3195             begin
3196                --  A single mechanism association without a formal parameter
3197                --  name is parsed as a parenthesized expression. All other
3198                --  cases are parsed as aggregates, so we rewrite the single
3199                --  parameter case as an aggregate for consistency.
3200
3201                if Nkind (Arg_Mechanism) /= N_Aggregate
3202                  and then Paren_Count (Arg_Mechanism) = 1
3203                then
3204                   Rewrite (Arg_Mechanism,
3205                     Make_Aggregate (Sloc (Arg_Mechanism),
3206                       Expressions => New_List (
3207                         Relocate_Node (Arg_Mechanism))));
3208                end if;
3209
3210                --  Case of only mechanism name given, applies to all formals
3211
3212                if Nkind (Arg_Mechanism) /= N_Aggregate then
3213                   Formal := First_Formal (Ent);
3214                   while Present (Formal) loop
3215                      Set_Mechanism_Value (Formal, Arg_Mechanism);
3216                      Next_Formal (Formal);
3217                   end loop;
3218
3219                --  Case of list of mechanism associations given
3220
3221                else
3222                   if Null_Record_Present (Arg_Mechanism) then
3223                      Error_Pragma_Arg
3224                        ("inappropriate form for Mechanism parameter",
3225                         Arg_Mechanism);
3226                   end if;
3227
3228                   --  Deal with positional ones first
3229
3230                   Formal := First_Formal (Ent);
3231
3232                   if Present (Expressions (Arg_Mechanism)) then
3233                      Mname := First (Expressions (Arg_Mechanism));
3234                      while Present (Mname) loop
3235                         if No (Formal) then
3236                            Error_Pragma_Arg
3237                              ("too many mechanism associations", Mname);
3238                         end if;
3239
3240                         Set_Mechanism_Value (Formal, Mname);
3241                         Next_Formal (Formal);
3242                         Next (Mname);
3243                      end loop;
3244                   end if;
3245
3246                   --  Deal with named entries
3247
3248                   if Present (Component_Associations (Arg_Mechanism)) then
3249                      Massoc := First (Component_Associations (Arg_Mechanism));
3250                      while Present (Massoc) loop
3251                         Choice := First (Choices (Massoc));
3252
3253                         if Nkind (Choice) /= N_Identifier
3254                           or else Present (Next (Choice))
3255                         then
3256                            Error_Pragma_Arg
3257                              ("incorrect form for mechanism association",
3258                               Massoc);
3259                         end if;
3260
3261                         Formal := First_Formal (Ent);
3262                         loop
3263                            if No (Formal) then
3264                               Error_Pragma_Arg
3265                                 ("parameter name & not present", Choice);
3266                            end if;
3267
3268                            if Chars (Choice) = Chars (Formal) then
3269                               Set_Mechanism_Value
3270                                 (Formal, Expression (Massoc));
3271
3272                               --  Set entity on identifier for ASIS
3273
3274                               Set_Entity (Choice, Formal);
3275
3276                               exit;
3277                            end if;
3278
3279                            Next_Formal (Formal);
3280                         end loop;
3281
3282                         Next (Massoc);
3283                      end loop;
3284                   end if;
3285                end if;
3286             end;
3287          end if;
3288
3289          --  Process First_Optional_Parameter argument if present. We have
3290          --  already checked that this is only allowed for the Import case.
3291
3292          if Present (Arg_First_Optional_Parameter) then
3293             if Nkind (Arg_First_Optional_Parameter) /= N_Identifier then
3294                Error_Pragma_Arg
3295                  ("first optional parameter must be formal parameter name",
3296                   Arg_First_Optional_Parameter);
3297             end if;
3298
3299             Formal := First_Formal (Ent);
3300             loop
3301                if No (Formal) then
3302                   Error_Pragma_Arg
3303                     ("specified formal parameter& not found",
3304                      Arg_First_Optional_Parameter);
3305                end if;
3306
3307                exit when Chars (Formal) =
3308                          Chars (Arg_First_Optional_Parameter);
3309
3310                Next_Formal (Formal);
3311             end loop;
3312
3313             Set_First_Optional_Parameter (Ent, Formal);
3314
3315             --  Check specified and all remaining formals have right form
3316
3317             while Present (Formal) loop
3318                if Ekind (Formal) /= E_In_Parameter then
3319                   Error_Msg_NE
3320                     ("optional formal& is not of mode in!",
3321                      Arg_First_Optional_Parameter, Formal);
3322
3323                else
3324                   Dval := Default_Value (Formal);
3325
3326                   if No (Dval) then
3327                      Error_Msg_NE
3328                        ("optional formal& does not have default value!",
3329                         Arg_First_Optional_Parameter, Formal);
3330
3331                   elsif Compile_Time_Known_Value_Or_Aggr (Dval) then
3332                      null;
3333
3334                   else
3335                      Error_Msg_FE
3336                        ("default value for optional formal& is non-static!",
3337                         Arg_First_Optional_Parameter, Formal);
3338                   end if;
3339                end if;
3340
3341                Set_Is_Optional_Parameter (Formal);
3342                Next_Formal (Formal);
3343             end loop;
3344          end if;
3345       end Process_Extended_Import_Export_Subprogram_Pragma;
3346
3347       --------------------------
3348       -- Process_Generic_List --
3349       --------------------------
3350
3351       procedure Process_Generic_List is
3352          Arg : Node_Id;
3353          Exp : Node_Id;
3354
3355       begin
3356          Check_No_Identifiers;
3357          Check_At_Least_N_Arguments (1);
3358
3359          Arg := Arg1;
3360          while Present (Arg) loop
3361             Exp := Expression (Arg);
3362             Analyze (Exp);
3363
3364             if not Is_Entity_Name (Exp)
3365               or else
3366                 (not Is_Generic_Instance (Entity (Exp))
3367                   and then
3368                  not Is_Generic_Unit (Entity (Exp)))
3369             then
3370                Error_Pragma_Arg
3371                  ("pragma% argument must be name of generic unit/instance",
3372                   Arg);
3373             end if;
3374
3375             Next (Arg);
3376          end loop;
3377       end Process_Generic_List;
3378
3379       ---------------------------------
3380       -- Process_Import_Or_Interface --
3381       ---------------------------------
3382
3383       procedure Process_Import_Or_Interface is
3384          C      : Convention_Id;
3385          Def_Id : Entity_Id;
3386          Hom_Id : Entity_Id;
3387
3388       begin
3389          Process_Convention (C, Def_Id);
3390          Kill_Size_Check_Code (Def_Id);
3391          Note_Possible_Modification (Expression (Arg2), Sure => False);
3392
3393          if Ekind (Def_Id) = E_Variable
3394               or else
3395             Ekind (Def_Id) = E_Constant
3396          then
3397             --  We do not permit Import to apply to a renaming declaration
3398
3399             if Present (Renamed_Object (Def_Id)) then
3400                Error_Pragma_Arg
3401                  ("pragma% not allowed for object renaming", Arg2);
3402
3403             --  User initialization is not allowed for imported object, but
3404             --  the object declaration may contain a default initialization,
3405             --  that will be discarded. Note that an explicit initialization
3406             --  only counts if it comes from source, otherwise it is simply
3407             --  the code generator making an implicit initialization explicit.
3408
3409             elsif Present (Expression (Parent (Def_Id)))
3410               and then Comes_From_Source (Expression (Parent (Def_Id)))
3411             then
3412                Error_Msg_Sloc := Sloc (Def_Id);
3413                Error_Pragma_Arg
3414                  ("no initialization allowed for declaration of& #",
3415                   "\imported entities cannot be initialized (RM B.1(24))",
3416                   Arg2);
3417
3418             else
3419                Set_Imported (Def_Id);
3420                Process_Interface_Name (Def_Id, Arg3, Arg4);
3421
3422                --  Note that we do not set Is_Public here. That's because we
3423                --  only want to set it if there is no address clause, and we
3424                --  don't know that yet, so we delay that processing till
3425                --  freeze time.
3426
3427                --  pragma Import completes deferred constants
3428
3429                if Ekind (Def_Id) = E_Constant then
3430                   Set_Has_Completion (Def_Id);
3431                end if;
3432
3433                --  It is not possible to import a constant of an unconstrained
3434                --  array type (e.g. string) because there is no simple way to
3435                --  write a meaningful subtype for it.
3436
3437                if Is_Array_Type (Etype (Def_Id))
3438                  and then not Is_Constrained (Etype (Def_Id))
3439                then
3440                   Error_Msg_NE
3441                     ("imported constant& must have a constrained subtype",
3442                       N, Def_Id);
3443                end if;
3444             end if;
3445
3446          elsif Is_Subprogram (Def_Id)
3447            or else Is_Generic_Subprogram (Def_Id)
3448          then
3449             --  If the name is overloaded, pragma applies to all of the
3450             --  denoted entities in the same declarative part.
3451
3452             Hom_Id := Def_Id;
3453             while Present (Hom_Id) loop
3454                Def_Id := Get_Base_Subprogram (Hom_Id);
3455
3456                --  Ignore inherited subprograms because the pragma will
3457                --  apply to the parent operation, which is the one called.
3458
3459                if Is_Overloadable (Def_Id)
3460                  and then Present (Alias (Def_Id))
3461                then
3462                   null;
3463
3464                --  If it is not a subprogram, it must be in an outer scope and
3465                --  pragma does not apply.
3466
3467                elsif not Is_Subprogram (Def_Id)
3468                  and then not Is_Generic_Subprogram (Def_Id)
3469                then
3470                   null;
3471
3472                --  Verify that the homonym is in the same declarative part (not
3473                --  just the same scope).
3474
3475                elsif Parent (Unit_Declaration_Node (Def_Id)) /= Parent (N)
3476                  and then Nkind (Parent (N)) /= N_Compilation_Unit_Aux
3477                then
3478                   exit;
3479
3480                else
3481                   Set_Imported (Def_Id);
3482
3483                   --  Reject an Import applied to an abstract subprogram
3484
3485                   if Is_Subprogram (Def_Id)
3486                     and then Is_Abstract_Subprogram (Def_Id)
3487                   then
3488                      Error_Msg_Sloc := Sloc (Def_Id);
3489                      Error_Msg_NE
3490                        ("cannot import abstract subprogram& declared#",
3491                         Arg2, Def_Id);
3492                   end if;
3493
3494                   --  Special processing for Convention_Intrinsic
3495
3496                   if C = Convention_Intrinsic then
3497
3498                      --  Link_Name argument not allowed for intrinsic
3499
3500                      if Present (Arg3)
3501                        and then Chars (Arg3) = Name_Link_Name
3502                      then
3503                         Arg4 := Arg3;
3504                      end if;
3505
3506                      if Present (Arg4) then
3507                         Error_Pragma_Arg
3508                           ("Link_Name argument not allowed for " &
3509                            "Import Intrinsic",
3510                            Arg4);
3511                      end if;
3512
3513                      Set_Is_Intrinsic_Subprogram (Def_Id);
3514
3515                      --  If no external name is present, then check that this
3516                      --  is a valid intrinsic subprogram. If an external name
3517                      --  is present, then this is handled by the back end.
3518
3519                      if No (Arg3) then
3520                         Check_Intrinsic_Subprogram (Def_Id, Expression (Arg2));
3521                      end if;
3522                   end if;
3523
3524                   --  All interfaced procedures need an external symbol created
3525                   --  for them since they are always referenced from another
3526                   --  object file.
3527
3528                   Set_Is_Public (Def_Id);
3529
3530                   --  Verify that the subprogram does not have a completion
3531                   --  through a renaming declaration. For other completions the
3532                   --  pragma appears as a too late representation.
3533
3534                   declare
3535                      Decl : constant Node_Id := Unit_Declaration_Node (Def_Id);
3536
3537                   begin
3538                      if Present (Decl)
3539                        and then Nkind (Decl) = N_Subprogram_Declaration
3540                        and then Present (Corresponding_Body (Decl))
3541                        and then Nkind (Unit_Declaration_Node
3542                                         (Corresponding_Body (Decl))) =
3543                                              N_Subprogram_Renaming_Declaration
3544                      then
3545                         Error_Msg_Sloc := Sloc (Def_Id);
3546                         Error_Msg_NE
3547                           ("cannot import&, renaming already provided for " &
3548                            "declaration #", N, Def_Id);
3549                      end if;
3550                   end;
3551
3552                   Set_Has_Completion (Def_Id);
3553                   Process_Interface_Name (Def_Id, Arg3, Arg4);
3554                end if;
3555
3556                if Is_Compilation_Unit (Hom_Id) then
3557
3558                   --  Its possible homonyms are not affected by the pragma.
3559                   --  Such homonyms might be present in the context of other
3560                   --  units being compiled.
3561
3562                   exit;
3563
3564                else
3565                   Hom_Id := Homonym (Hom_Id);
3566                end if;
3567             end loop;
3568
3569          --  When the convention is Java or CIL, we also allow Import to be
3570          --  given for packages, generic packages, exceptions, record
3571          --  components, and access to subprograms.
3572
3573          elsif (C = Convention_Java or else C = Convention_CIL)
3574            and then
3575              (Is_Package_Or_Generic_Package (Def_Id)
3576                or else Ekind (Def_Id) = E_Exception
3577                or else Ekind (Def_Id) = E_Access_Subprogram_Type
3578                or else Nkind (Parent (Def_Id)) = N_Component_Declaration)
3579          then
3580             Set_Imported (Def_Id);
3581             Set_Is_Public (Def_Id);
3582             Process_Interface_Name (Def_Id, Arg3, Arg4);
3583
3584          --  Import a CPP class
3585
3586          elsif Is_Record_Type (Def_Id)
3587            and then C = Convention_CPP
3588          then
3589             --  Types treated as CPP classes are treated as limited, but we
3590             --  don't require them to be declared this way. A warning is
3591             --  issued to encourage the user to declare them as limited.
3592             --  This is not an error, for compatibility reasons, because
3593             --  these types have been supported this way for some time.
3594
3595             if not Is_Limited_Type (Def_Id) then
3596                Error_Msg_N
3597                  ("imported 'C'P'P type should be " &
3598                     "explicitly declared limited?",
3599                   Get_Pragma_Arg (Arg2));
3600                Error_Msg_N
3601                  ("\type will be considered limited",
3602                   Get_Pragma_Arg (Arg2));
3603             end if;
3604
3605             Set_Is_CPP_Class (Def_Id);
3606             Set_Is_Limited_Record (Def_Id);
3607
3608             --  Imported CPP types must not have discriminants (because C++
3609             --  classes do not have discriminants).
3610
3611             if Has_Discriminants (Def_Id) then
3612                Error_Msg_N
3613                  ("imported 'C'P'P type cannot have discriminants",
3614                   First (Discriminant_Specifications
3615                           (Declaration_Node (Def_Id))));
3616             end if;
3617
3618             --  Components of imported CPP types must not have default
3619             --  expressions because the constructor (if any) is on the
3620             --  C++ side.
3621
3622             declare
3623                Tdef  : constant Node_Id :=
3624                          Type_Definition (Declaration_Node (Def_Id));
3625                Clist : Node_Id;
3626                Comp  : Node_Id;
3627
3628             begin
3629                if Nkind (Tdef) = N_Record_Definition then
3630                   Clist := Component_List (Tdef);
3631
3632                else
3633                   pragma Assert (Nkind (Tdef) = N_Derived_Type_Definition);
3634                   Clist := Component_List (Record_Extension_Part (Tdef));
3635                end if;
3636
3637                if Present (Clist) then
3638                   Comp := First (Component_Items (Clist));
3639                   while Present (Comp) loop
3640                      if Present (Expression (Comp)) then
3641                         Error_Msg_N
3642                           ("component of imported 'C'P'P type cannot have" &
3643                            " default expression", Expression (Comp));
3644                      end if;
3645
3646                      Next (Comp);
3647                   end loop;
3648                end if;
3649             end;
3650
3651          else
3652             Error_Pragma_Arg
3653               ("second argument of pragma% must be object or subprogram",
3654                Arg2);
3655          end if;
3656
3657          --  If this pragma applies to a compilation unit, then the unit, which
3658          --  is a subprogram, does not require (or allow) a body. We also do
3659          --  not need to elaborate imported procedures.
3660
3661          if Nkind (Parent (N)) = N_Compilation_Unit_Aux then
3662             declare
3663                Cunit : constant Node_Id := Parent (Parent (N));
3664             begin
3665                Set_Body_Required (Cunit, False);
3666             end;
3667          end if;
3668       end Process_Import_Or_Interface;
3669
3670       --------------------
3671       -- Process_Inline --
3672       --------------------
3673
3674       procedure Process_Inline (Active : Boolean) is
3675          Assoc     : Node_Id;
3676          Decl      : Node_Id;
3677          Subp_Id   : Node_Id;
3678          Subp      : Entity_Id;
3679          Applies   : Boolean;
3680          Effective : Boolean := False;
3681
3682          procedure Make_Inline (Subp : Entity_Id);
3683          --  Subp is the defining unit name of the subprogram declaration. Set
3684          --  the flag, as well as the flag in the corresponding body, if there
3685          --  is one present.
3686
3687          procedure Set_Inline_Flags (Subp : Entity_Id);
3688          --  Sets Is_Inlined and Has_Pragma_Inline flags for Subp and also
3689          --  Has_Pragma_Inline_Always for the Inline_Always case.
3690
3691          function Inlining_Not_Possible (Subp : Entity_Id) return Boolean;
3692          --  Returns True if it can be determined at this stage that inlining
3693          --  is not possible, for example if the body is available and contains
3694          --  exception handlers, we prevent inlining, since otherwise we can
3695          --  get undefined symbols at link time. This function also emits a
3696          --  warning if front-end inlining is enabled and the pragma appears
3697          --  too late.
3698          --
3699          --  ??? is business with link symbols still valid, or does it relate
3700          --  to front end ZCX which is being phased out ???
3701
3702          ---------------------------
3703          -- Inlining_Not_Possible --
3704          ---------------------------
3705
3706          function Inlining_Not_Possible (Subp : Entity_Id) return Boolean is
3707             Decl  : constant Node_Id := Unit_Declaration_Node (Subp);
3708             Stats : Node_Id;
3709
3710          begin
3711             if Nkind (Decl) = N_Subprogram_Body then
3712                Stats := Handled_Statement_Sequence (Decl);
3713                return Present (Exception_Handlers (Stats))
3714                  or else Present (At_End_Proc (Stats));
3715
3716             elsif Nkind (Decl) = N_Subprogram_Declaration
3717               and then Present (Corresponding_Body (Decl))
3718             then
3719                if Front_End_Inlining
3720                  and then Analyzed (Corresponding_Body (Decl))
3721                then
3722                   Error_Msg_N ("pragma appears too late, ignored?", N);
3723                   return True;
3724
3725                --  If the subprogram is a renaming as body, the body is just a
3726                --  call to the renamed subprogram, and inlining is trivially
3727                --  possible.
3728
3729                elsif
3730                  Nkind (Unit_Declaration_Node (Corresponding_Body (Decl))) =
3731                                              N_Subprogram_Renaming_Declaration
3732                then
3733                   return False;
3734
3735                else
3736                   Stats :=
3737                     Handled_Statement_Sequence
3738                         (Unit_Declaration_Node (Corresponding_Body (Decl)));
3739
3740                   return
3741                     Present (Exception_Handlers (Stats))
3742                       or else Present (At_End_Proc (Stats));
3743                end if;
3744
3745             else
3746                --  If body is not available, assume the best, the check is
3747                --  performed again when compiling enclosing package bodies.
3748
3749                return False;
3750             end if;
3751          end Inlining_Not_Possible;
3752
3753          -----------------
3754          -- Make_Inline --
3755          -----------------
3756
3757          procedure Make_Inline (Subp : Entity_Id) is
3758             Kind       : constant Entity_Kind := Ekind (Subp);
3759             Inner_Subp : Entity_Id   := Subp;
3760
3761          begin
3762             --  Ignore if bad type, avoid cascaded error
3763
3764             if Etype (Subp) = Any_Type then
3765                Applies := True;
3766                return;
3767
3768             --  Ignore if all inlining is suppressed
3769
3770             elsif Suppress_All_Inlining then
3771                Applies := True;
3772                return;
3773
3774             --  If inlining is not possible, for now do not treat as an error
3775
3776             elsif Inlining_Not_Possible (Subp) then
3777                Applies := True;
3778                return;
3779
3780             --  Here we have a candidate for inlining, but we must exclude
3781             --  derived operations. Otherwise we would end up trying to inline
3782             --  a phantom declaration, and the result would be to drag in a
3783             --  body which has no direct inlining associated with it. That
3784             --  would not only be inefficient but would also result in the
3785             --  backend doing cross-unit inlining in cases where it was
3786             --  definitely inappropriate to do so.
3787
3788             --  However, a simple Comes_From_Source test is insufficient, since
3789             --  we do want to allow inlining of generic instances which also do
3790             --  not come from source. We also need to recognize specs generated
3791             --  by the front-end for bodies that carry the pragma. Finally,
3792             --  predefined operators do not come from source but are not
3793             --  inlineable either.
3794
3795             elsif Is_Generic_Instance (Subp)
3796               or else Nkind (Parent (Parent (Subp))) = N_Subprogram_Declaration
3797             then
3798                null;
3799
3800             elsif not Comes_From_Source (Subp)
3801               and then Scope (Subp) /= Standard_Standard
3802             then
3803                Applies := True;
3804                return;
3805             end if;
3806
3807             --  The referenced entity must either be the enclosing entity, or
3808             --  an entity declared within the current open scope.
3809
3810             if Present (Scope (Subp))
3811               and then Scope (Subp) /= Current_Scope
3812               and then Subp /= Current_Scope
3813             then
3814                Error_Pragma_Arg
3815                  ("argument of% must be entity in current scope", Assoc);
3816                return;
3817             end if;
3818
3819             --  Processing for procedure, operator or function. If subprogram
3820             --  is aliased (as for an instance) indicate that the renamed
3821             --  entity (if declared in the same unit) is inlined.
3822
3823             if Is_Subprogram (Subp) then
3824                while Present (Alias (Inner_Subp)) loop
3825                   Inner_Subp := Alias (Inner_Subp);
3826                end loop;
3827
3828                if In_Same_Source_Unit (Subp, Inner_Subp) then
3829                   Set_Inline_Flags (Inner_Subp);
3830
3831                   Decl := Parent (Parent (Inner_Subp));
3832
3833                   if Nkind (Decl) = N_Subprogram_Declaration
3834                     and then Present (Corresponding_Body (Decl))
3835                   then
3836                      Set_Inline_Flags (Corresponding_Body (Decl));
3837
3838                   elsif Is_Generic_Instance (Subp) then
3839
3840                      --  Indicate that the body needs to be created for
3841                      --  inlining subsequent calls. The instantiation node
3842                      --  follows the declaration of the wrapper package
3843                      --  created for it.
3844
3845                      if Scope (Subp) /= Standard_Standard
3846                        and then
3847                          Need_Subprogram_Instance_Body
3848                           (Next (Unit_Declaration_Node (Scope (Alias (Subp)))),
3849                               Subp)
3850                      then
3851                         null;
3852                      end if;
3853                   end if;
3854                end if;
3855
3856                Applies := True;
3857
3858             --  For a generic subprogram set flag as well, for use at the point
3859             --  of instantiation, to determine whether the body should be
3860             --  generated.
3861
3862             elsif Is_Generic_Subprogram (Subp) then
3863                Set_Inline_Flags (Subp);
3864                Applies := True;
3865
3866             --  Literals are by definition inlined
3867
3868             elsif Kind = E_Enumeration_Literal then
3869                null;
3870
3871             --  Anything else is an error
3872
3873             else
3874                Error_Pragma_Arg
3875                  ("expect subprogram name for pragma%", Assoc);
3876             end if;
3877          end Make_Inline;
3878
3879          ----------------------
3880          -- Set_Inline_Flags --
3881          ----------------------
3882
3883          procedure Set_Inline_Flags (Subp : Entity_Id) is
3884          begin
3885             if Active then
3886                Set_Is_Inlined (Subp, True);
3887             end if;
3888
3889             if not Has_Pragma_Inline (Subp) then
3890                Set_Has_Pragma_Inline (Subp);
3891                Effective := True;
3892             end if;
3893
3894             if Prag_Id = Pragma_Inline_Always then
3895                Set_Has_Pragma_Inline_Always (Subp);
3896             end if;
3897          end Set_Inline_Flags;
3898
3899       --  Start of processing for Process_Inline
3900
3901       begin
3902          Check_No_Identifiers;
3903          Check_At_Least_N_Arguments (1);
3904
3905          if Active then
3906             Inline_Processing_Required := True;
3907          end if;
3908
3909          Assoc := Arg1;
3910          while Present (Assoc) loop
3911             Subp_Id := Expression (Assoc);
3912             Analyze (Subp_Id);
3913             Applies := False;
3914
3915             if Is_Entity_Name (Subp_Id) then
3916                Subp := Entity (Subp_Id);
3917
3918                if Subp = Any_Id then
3919
3920                   --  If previous error, avoid cascaded errors
3921
3922                   Applies := True;
3923                   Effective := True;
3924
3925                else
3926                   Make_Inline (Subp);
3927
3928                   while Present (Homonym (Subp))
3929                     and then Scope (Homonym (Subp)) = Current_Scope
3930                   loop
3931                      Make_Inline (Homonym (Subp));
3932                      Subp := Homonym (Subp);
3933                   end loop;
3934                end if;
3935             end if;
3936
3937             if not Applies then
3938                Error_Pragma_Arg
3939                  ("inappropriate argument for pragma%", Assoc);
3940
3941             elsif not Effective
3942               and then Warn_On_Redundant_Constructs
3943               and then not Suppress_All_Inlining
3944             then
3945                if Inlining_Not_Possible (Subp) then
3946                   Error_Msg_NE
3947                     ("pragma Inline for& is ignored?", N, Entity (Subp_Id));
3948                else
3949                   Error_Msg_NE
3950                     ("pragma Inline for& is redundant?", N, Entity (Subp_Id));
3951                end if;
3952             end if;
3953
3954             Next (Assoc);
3955          end loop;
3956       end Process_Inline;
3957
3958       ----------------------------
3959       -- Process_Interface_Name --
3960       ----------------------------
3961
3962       procedure Process_Interface_Name
3963         (Subprogram_Def : Entity_Id;
3964          Ext_Arg        : Node_Id;
3965          Link_Arg       : Node_Id)
3966       is
3967          Ext_Nam    : Node_Id;
3968          Link_Nam   : Node_Id;
3969          String_Val : String_Id;
3970
3971          procedure Check_Form_Of_Interface_Name
3972            (SN            : Node_Id;
3973             Ext_Name_Case : Boolean);
3974          --  SN is a string literal node for an interface name. This routine
3975          --  performs some minimal checks that the name is reasonable. In
3976          --  particular that no spaces or other obviously incorrect characters
3977          --  appear. This is only a warning, since any characters are allowed.
3978          --  Ext_Name_Case is True for an External_Name, False for a Link_Name.
3979
3980          ----------------------------------
3981          -- Check_Form_Of_Interface_Name --
3982          ----------------------------------
3983
3984          procedure Check_Form_Of_Interface_Name
3985            (SN            : Node_Id;
3986             Ext_Name_Case : Boolean)
3987          is
3988             S  : constant String_Id := Strval (Expr_Value_S (SN));
3989             SL : constant Nat       := String_Length (S);
3990             C  : Char_Code;
3991
3992          begin
3993             if SL = 0 then
3994                Error_Msg_N ("interface name cannot be null string", SN);
3995             end if;
3996
3997             for J in 1 .. SL loop
3998                C := Get_String_Char (S, J);
3999
4000                --  Look for dubious character and issue unconditional warning.
4001                --  Definitely dubious if not in character range.
4002
4003                if not In_Character_Range (C)
4004
4005                   --  For all cases except CLI target,
4006                   --  commas, spaces and slashes are dubious (in CLI, we use
4007                   --  commas and backslashes in external names to specify
4008                   --  assembly version and public key, while slashes and spaces
4009                   --  can be used in names to mark nested classes and
4010                   --  valuetypes).
4011
4012                   or else ((not Ext_Name_Case or else VM_Target /= CLI_Target)
4013                              and then (Get_Character (C) = ','
4014                                          or else
4015                                        Get_Character (C) = '\'))
4016                  or else (VM_Target /= CLI_Target
4017                             and then (Get_Character (C) = ' '
4018                                         or else
4019                                       Get_Character (C) = '/'))
4020                then
4021                   Error_Msg
4022                     ("?interface name contains illegal character",
4023                      Sloc (SN) + Source_Ptr (J));
4024                end if;
4025             end loop;
4026          end Check_Form_Of_Interface_Name;
4027
4028       --  Start of processing for Process_Interface_Name
4029
4030       begin
4031          if No (Link_Arg) then
4032             if No (Ext_Arg) then
4033                if VM_Target = CLI_Target
4034                  and then Ekind (Subprogram_Def) = E_Package
4035                  and then Nkind (Parent (Subprogram_Def)) =
4036                                                  N_Package_Specification
4037                  and then Present (Generic_Parent (Parent (Subprogram_Def)))
4038                then
4039                   Set_Interface_Name
4040                      (Subprogram_Def,
4041                       Interface_Name
4042                         (Generic_Parent (Parent (Subprogram_Def))));
4043                end if;
4044
4045                return;
4046
4047             elsif Chars (Ext_Arg) = Name_Link_Name then
4048                Ext_Nam  := Empty;
4049                Link_Nam := Expression (Ext_Arg);
4050
4051             else
4052                Check_Optional_Identifier (Ext_Arg, Name_External_Name);
4053                Ext_Nam  := Expression (Ext_Arg);
4054                Link_Nam := Empty;
4055             end if;
4056
4057          else
4058             Check_Optional_Identifier (Ext_Arg,  Name_External_Name);
4059             Check_Optional_Identifier (Link_Arg, Name_Link_Name);
4060             Ext_Nam  := Expression (Ext_Arg);
4061             Link_Nam := Expression (Link_Arg);
4062          end if;
4063
4064          --  Check expressions for external name and link name are static
4065
4066          if Present (Ext_Nam) then
4067             Check_Arg_Is_Static_Expression (Ext_Nam, Standard_String);
4068             Check_Form_Of_Interface_Name (Ext_Nam, Ext_Name_Case => True);
4069
4070             --  Verify that external name is not the name of a local entity,
4071             --  which would hide the imported one and could lead to run-time
4072             --  surprises. The problem can only arise for entities declared in
4073             --  a package body (otherwise the external name is fully qualified
4074             --  and will not conflict).
4075
4076             declare
4077                Nam : Name_Id;
4078                E   : Entity_Id;
4079                Par : Node_Id;
4080
4081             begin
4082                if Prag_Id = Pragma_Import then
4083                   String_To_Name_Buffer (Strval (Expr_Value_S (Ext_Nam)));
4084                   Nam := Name_Find;
4085                   E   := Entity_Id (Get_Name_Table_Info (Nam));
4086
4087                   if Nam /= Chars (Subprogram_Def)
4088                     and then Present (E)
4089                     and then not Is_Overloadable (E)
4090                     and then Is_Immediately_Visible (E)
4091                     and then not Is_Imported (E)
4092                     and then Ekind (Scope (E)) = E_Package
4093                   then
4094                      Par := Parent (E);
4095                      while Present (Par) loop
4096                         if Nkind (Par) = N_Package_Body then
4097                            Error_Msg_Sloc := Sloc (E);
4098                            Error_Msg_NE
4099                              ("imported entity is hidden by & declared#",
4100                               Ext_Arg, E);
4101                            exit;
4102                         end if;
4103
4104                         Par := Parent (Par);
4105                      end loop;
4106                   end if;
4107                end if;
4108             end;
4109          end if;
4110
4111          if Present (Link_Nam) then
4112             Check_Arg_Is_Static_Expression (Link_Nam, Standard_String);
4113             Check_Form_Of_Interface_Name (Link_Nam, Ext_Name_Case => False);
4114          end if;
4115
4116          --  If there is no link name, just set the external name
4117
4118          if No (Link_Nam) then
4119             Link_Nam := Adjust_External_Name_Case (Expr_Value_S (Ext_Nam));
4120
4121          --  For the Link_Name case, the given literal is preceded by an
4122          --  asterisk, which indicates to GCC that the given name should be
4123          --  taken literally, and in particular that no prepending of
4124          --  underlines should occur, even in systems where this is the
4125          --  normal default.
4126
4127          else
4128             Start_String;
4129
4130             if VM_Target = No_VM then
4131                Store_String_Char (Get_Char_Code ('*'));
4132             end if;
4133
4134             String_Val := Strval (Expr_Value_S (Link_Nam));
4135             Store_String_Chars (String_Val);
4136             Link_Nam :=
4137               Make_String_Literal (Sloc (Link_Nam),
4138                 Strval => End_String);
4139          end if;
4140
4141          Set_Encoded_Interface_Name
4142            (Get_Base_Subprogram (Subprogram_Def), Link_Nam);
4143          Check_Duplicated_Export_Name (Link_Nam);
4144       end Process_Interface_Name;
4145
4146       -----------------------------------------
4147       -- Process_Interrupt_Or_Attach_Handler --
4148       -----------------------------------------
4149
4150       procedure Process_Interrupt_Or_Attach_Handler is
4151          Arg1_X       : constant Node_Id   := Expression (Arg1);
4152          Handler_Proc : constant Entity_Id := Entity (Arg1_X);
4153          Proc_Scope   : constant Entity_Id := Scope (Handler_Proc);
4154
4155       begin
4156          Set_Is_Interrupt_Handler (Handler_Proc);
4157
4158          --  If the pragma is not associated with a handler procedure within a
4159          --  protected type, then it must be for a nonprotected procedure for
4160          --  the AAMP target, in which case we don't associate a representation
4161          --  item with the procedure's scope.
4162
4163          if Ekind (Proc_Scope) = E_Protected_Type then
4164             if Prag_Id = Pragma_Interrupt_Handler
4165                  or else
4166                Prag_Id = Pragma_Attach_Handler
4167             then
4168                Record_Rep_Item (Proc_Scope, N);
4169             end if;
4170          end if;
4171       end Process_Interrupt_Or_Attach_Handler;
4172
4173       --------------------------------------------------
4174       -- Process_Restrictions_Or_Restriction_Warnings --
4175       --------------------------------------------------
4176
4177       --  Note: some of the simple identifier cases were handled in par-prag,
4178       --  but it is harmless (and more straightforward) to simply handle all
4179       --  cases here, even if it means we repeat a bit of work in some cases.
4180
4181       procedure Process_Restrictions_Or_Restriction_Warnings
4182         (Warn : Boolean)
4183       is
4184          Arg   : Node_Id;
4185          R_Id  : Restriction_Id;
4186          Id    : Name_Id;
4187          Expr  : Node_Id;
4188          Val   : Uint;
4189
4190          procedure Check_Unit_Name (N : Node_Id);
4191          --  Checks unit name parameter for No_Dependence. Returns if it has
4192          --  an appropriate form, otherwise raises pragma argument error.
4193
4194          ---------------------
4195          -- Check_Unit_Name --
4196          ---------------------
4197
4198          procedure Check_Unit_Name (N : Node_Id) is
4199          begin
4200             if Nkind (N) = N_Selected_Component then
4201                Check_Unit_Name (Prefix (N));
4202                Check_Unit_Name (Selector_Name (N));
4203
4204             elsif Nkind (N) = N_Identifier then
4205                return;
4206
4207             else
4208                Error_Pragma_Arg
4209                  ("wrong form for unit name for No_Dependence", N);
4210             end if;
4211          end Check_Unit_Name;
4212
4213       --  Start of processing for Process_Restrictions_Or_Restriction_Warnings
4214
4215       begin
4216          Check_Ada_83_Warning;
4217          Check_At_Least_N_Arguments (1);
4218          Check_Valid_Configuration_Pragma;
4219
4220          Arg := Arg1;
4221          while Present (Arg) loop
4222             Id := Chars (Arg);
4223             Expr := Expression (Arg);
4224
4225             --  Case of no restriction identifier present
4226
4227             if Id = No_Name then
4228                if Nkind (Expr) /= N_Identifier then
4229                   Error_Pragma_Arg
4230                     ("invalid form for restriction", Arg);
4231                end if;
4232
4233                R_Id :=
4234                  Get_Restriction_Id
4235                    (Process_Restriction_Synonyms (Expr));
4236
4237                if R_Id not in All_Boolean_Restrictions then
4238                   Error_Msg_Name_1 := Pname;
4239                   Error_Msg_N
4240                     ("invalid restriction identifier&", Get_Pragma_Arg (Arg));
4241
4242                   --  Check for possible misspelling
4243
4244                   for J in Restriction_Id loop
4245                      declare
4246                         Rnm : constant String := Restriction_Id'Image (J);
4247
4248                      begin
4249                         Name_Buffer (1 .. Rnm'Length) := Rnm;
4250                         Name_Len := Rnm'Length;
4251                         Set_Casing (All_Lower_Case);
4252
4253                         if Is_Bad_Spelling_Of (Chars (Expr), Name_Enter) then
4254                            Set_Casing
4255                              (Identifier_Casing (Current_Source_File));
4256                            Error_Msg_String (1 .. Rnm'Length) :=
4257                              Name_Buffer (1 .. Name_Len);
4258                            Error_Msg_Strlen := Rnm'Length;
4259                            Error_Msg_N -- CODEFIX
4260                              ("\possible misspelling of ""~""",
4261                               Get_Pragma_Arg (Arg));
4262                            exit;
4263                         end if;
4264                      end;
4265                   end loop;
4266
4267                   raise Pragma_Exit;
4268                end if;
4269
4270                if Implementation_Restriction (R_Id) then
4271                   Check_Restriction (No_Implementation_Restrictions, Arg);
4272                end if;
4273
4274                --  If this is a warning, then set the warning unless we already
4275                --  have a real restriction active (we never want a warning to
4276                --  override a real restriction).
4277
4278                if Warn then
4279                   if not Restriction_Active (R_Id) then
4280                      Set_Restriction (R_Id, N);
4281                      Restriction_Warnings (R_Id) := True;
4282                   end if;
4283
4284                --  If real restriction case, then set it and make sure that the
4285                --  restriction warning flag is off, since a real restriction
4286                --  always overrides a warning.
4287
4288                else
4289                   Set_Restriction (R_Id, N);
4290                   Restriction_Warnings (R_Id) := False;
4291                end if;
4292
4293                --  A very special case that must be processed here: pragma
4294                --  Restrictions (No_Exceptions) turns off all run-time
4295                --  checking. This is a bit dubious in terms of the formal
4296                --  language definition, but it is what is intended by RM
4297                --  H.4(12). Restriction_Warnings never affects generated code
4298                --  so this is done only in the real restriction case.
4299
4300                if R_Id = No_Exceptions and then not Warn then
4301                   Scope_Suppress := (others => True);
4302                end if;
4303
4304             --  Case of No_Dependence => unit-name. Note that the parser
4305             --  already made the necessary entry in the No_Dependence table.
4306
4307             elsif Id = Name_No_Dependence then
4308                Check_Unit_Name (Expr);
4309
4310             --  All other cases of restriction identifier present
4311
4312             else
4313                R_Id := Get_Restriction_Id (Process_Restriction_Synonyms (Arg));
4314                Analyze_And_Resolve (Expr, Any_Integer);
4315
4316                if R_Id not in All_Parameter_Restrictions then
4317                   Error_Pragma_Arg
4318                     ("invalid restriction parameter identifier", Arg);
4319
4320                elsif not Is_OK_Static_Expression (Expr) then
4321                   Flag_Non_Static_Expr
4322                     ("value must be static expression!", Expr);
4323                   raise Pragma_Exit;
4324
4325                elsif not Is_Integer_Type (Etype (Expr))
4326                  or else Expr_Value (Expr) < 0
4327                then
4328                   Error_Pragma_Arg
4329                     ("value must be non-negative integer", Arg);
4330                end if;
4331
4332                --  Restriction pragma is active
4333
4334                Val := Expr_Value (Expr);
4335
4336                if not UI_Is_In_Int_Range (Val) then
4337                   Error_Pragma_Arg
4338                     ("pragma ignored, value too large?", Arg);
4339                end if;
4340
4341                --  Warning case. If the real restriction is active, then we
4342                --  ignore the request, since warning never overrides a real
4343                --  restriction. Otherwise we set the proper warning. Note that
4344                --  this circuit sets the warning again if it is already set,
4345                --  which is what we want, since the constant may have changed.
4346
4347                if Warn then
4348                   if not Restriction_Active (R_Id) then
4349                      Set_Restriction
4350                        (R_Id, N, Integer (UI_To_Int (Val)));
4351                      Restriction_Warnings (R_Id) := True;
4352                   end if;
4353
4354                --  Real restriction case, set restriction and make sure warning
4355                --  flag is off since real restriction always overrides warning.
4356
4357                else
4358                   Set_Restriction (R_Id, N, Integer (UI_To_Int (Val)));
4359                   Restriction_Warnings (R_Id) := False;
4360                end if;
4361             end if;
4362
4363             Next (Arg);
4364          end loop;
4365       end Process_Restrictions_Or_Restriction_Warnings;
4366
4367       ---------------------------------
4368       -- Process_Suppress_Unsuppress --
4369       ---------------------------------
4370
4371       --  Note: this procedure makes entries in the check suppress data
4372       --  structures managed by Sem. See spec of package Sem for full
4373       --  details on how we handle recording of check suppression.
4374
4375       procedure Process_Suppress_Unsuppress (Suppress_Case : Boolean) is
4376          C    : Check_Id;
4377          E_Id : Node_Id;
4378          E    : Entity_Id;
4379
4380          In_Package_Spec : constant Boolean :=
4381                              Is_Package_Or_Generic_Package (Current_Scope)
4382                                and then not In_Package_Body (Current_Scope);
4383
4384          procedure Suppress_Unsuppress_Echeck (E : Entity_Id; C : Check_Id);
4385          --  Used to suppress a single check on the given entity
4386
4387          --------------------------------
4388          -- Suppress_Unsuppress_Echeck --
4389          --------------------------------
4390
4391          procedure Suppress_Unsuppress_Echeck (E : Entity_Id; C : Check_Id) is
4392          begin
4393             Set_Checks_May_Be_Suppressed (E);
4394
4395             if In_Package_Spec then
4396                Push_Global_Suppress_Stack_Entry
4397                  (Entity   => E,
4398                   Check    => C,
4399                   Suppress => Suppress_Case);
4400
4401             else
4402                Push_Local_Suppress_Stack_Entry
4403                  (Entity   => E,
4404                   Check    => C,
4405                   Suppress => Suppress_Case);
4406             end if;
4407
4408             --  If this is a first subtype, and the base type is distinct,
4409             --  then also set the suppress flags on the base type.
4410
4411             if Is_First_Subtype (E)
4412               and then Etype (E) /= E
4413             then
4414                Suppress_Unsuppress_Echeck (Etype (E), C);
4415             end if;
4416          end Suppress_Unsuppress_Echeck;
4417
4418       --  Start of processing for Process_Suppress_Unsuppress
4419
4420       begin
4421          --  Suppress/Unsuppress can appear as a configuration pragma, or in a
4422          --  declarative part or a package spec (RM 11.5(5)).
4423
4424          if not Is_Configuration_Pragma then
4425             Check_Is_In_Decl_Part_Or_Package_Spec;
4426          end if;
4427
4428          Check_At_Least_N_Arguments (1);
4429          Check_At_Most_N_Arguments (2);
4430          Check_No_Identifier (Arg1);
4431          Check_Arg_Is_Identifier (Arg1);
4432
4433          C := Get_Check_Id (Chars (Expression (Arg1)));
4434
4435          if C = No_Check_Id then
4436             Error_Pragma_Arg
4437               ("argument of pragma% is not valid check name", Arg1);
4438          end if;
4439
4440          if not Suppress_Case
4441            and then (C = All_Checks or else C = Overflow_Check)
4442          then
4443             Opt.Overflow_Checks_Unsuppressed := True;
4444          end if;
4445
4446          if Arg_Count = 1 then
4447
4448             --  Make an entry in the local scope suppress table. This is the
4449             --  table that directly shows the current value of the scope
4450             --  suppress check for any check id value.
4451
4452             if C = All_Checks then
4453
4454                --  For All_Checks, we set all specific predefined checks with
4455                --  the exception of Elaboration_Check, which is handled
4456                --  specially because of not wanting All_Checks to have the
4457                --  effect of deactivating static elaboration order processing.
4458
4459                for J in Scope_Suppress'Range loop
4460                   if J /= Elaboration_Check then
4461                      Scope_Suppress (J) := Suppress_Case;
4462                   end if;
4463                end loop;
4464
4465             --  If not All_Checks, and predefined check, then set appropriate
4466             --  scope entry. Note that we will set Elaboration_Check if this
4467             --  is explicitly specified.
4468
4469             elsif C in Predefined_Check_Id then
4470                Scope_Suppress (C) := Suppress_Case;
4471             end if;
4472
4473             --  Also make an entry in the Local_Entity_Suppress table
4474
4475             Push_Local_Suppress_Stack_Entry
4476               (Entity   => Empty,
4477                Check    => C,
4478                Suppress => Suppress_Case);
4479
4480          --  Case of two arguments present, where the check is suppressed for
4481          --  a specified entity (given as the second argument of the pragma)
4482
4483          else
4484             Check_Optional_Identifier (Arg2, Name_On);
4485             E_Id := Expression (Arg2);
4486             Analyze (E_Id);
4487
4488             if not Is_Entity_Name (E_Id) then
4489                Error_Pragma_Arg
4490                  ("second argument of pragma% must be entity name", Arg2);
4491             end if;
4492
4493             E := Entity (E_Id);
4494
4495             if E = Any_Id then
4496                return;
4497             end if;
4498
4499             --  Enforce RM 11.5(7) which requires that for a pragma that
4500             --  appears within a package spec, the named entity must be
4501             --  within the package spec. We allow the package name itself
4502             --  to be mentioned since that makes sense, although it is not
4503             --  strictly allowed by 11.5(7).
4504
4505             if In_Package_Spec
4506               and then E /= Current_Scope
4507               and then Scope (E) /= Current_Scope
4508             then
4509                Error_Pragma_Arg
4510                  ("entity in pragma% is not in package spec (RM 11.5(7))",
4511                   Arg2);
4512             end if;
4513
4514             --  Loop through homonyms. As noted below, in the case of a package
4515             --  spec, only homonyms within the package spec are considered.
4516
4517             loop
4518                Suppress_Unsuppress_Echeck (E, C);
4519
4520                if Is_Generic_Instance (E)
4521                  and then Is_Subprogram (E)
4522                  and then Present (Alias (E))
4523                then
4524                   Suppress_Unsuppress_Echeck (Alias (E), C);
4525                end if;
4526
4527                --  Move to next homonym
4528
4529                E := Homonym (E);
4530                exit when No (E);
4531
4532                --  If we are within a package specification, the pragma only
4533                --  applies to homonyms in the same scope.
4534
4535                exit when In_Package_Spec
4536                  and then Scope (E) /= Current_Scope;
4537             end loop;
4538          end if;
4539       end Process_Suppress_Unsuppress;
4540
4541       ------------------
4542       -- Set_Exported --
4543       ------------------
4544
4545       procedure Set_Exported (E : Entity_Id; Arg : Node_Id) is
4546       begin
4547          if Is_Imported (E) then
4548             Error_Pragma_Arg
4549               ("cannot export entity& that was previously imported", Arg);
4550
4551          elsif Present (Address_Clause (E)) then
4552             Error_Pragma_Arg
4553               ("cannot export entity& that has an address clause", Arg);
4554          end if;
4555
4556          Set_Is_Exported (E);
4557
4558          --  Generate a reference for entity explicitly, because the
4559          --  identifier may be overloaded and name resolution will not
4560          --  generate one.
4561
4562          Generate_Reference (E, Arg);
4563
4564          --  Deal with exporting non-library level entity
4565
4566          if not Is_Library_Level_Entity (E) then
4567
4568             --  Not allowed at all for subprograms
4569
4570             if Is_Subprogram (E) then
4571                Error_Pragma_Arg ("local subprogram& cannot be exported", Arg);
4572
4573             --  Otherwise set public and statically allocated
4574
4575             else
4576                Set_Is_Public (E);
4577                Set_Is_Statically_Allocated (E);
4578
4579                --  Warn if the corresponding W flag is set and the pragma comes
4580                --  from source. The latter may not be true e.g. on VMS where we
4581                --  expand export pragmas for exception codes associated with
4582                --  imported or exported exceptions. We do not want to generate
4583                --  a warning for something that the user did not write.
4584
4585                if Warn_On_Export_Import
4586                  and then Comes_From_Source (Arg)
4587                then
4588                   Error_Msg_NE
4589                     ("?& has been made static as a result of Export", Arg, E);
4590                   Error_Msg_N
4591                     ("\this usage is non-standard and non-portable", Arg);
4592                end if;
4593             end if;
4594          end if;
4595
4596          if Warn_On_Export_Import and then Is_Type (E) then
4597             Error_Msg_NE
4598               ("exporting a type has no effect?", Arg, E);
4599          end if;
4600
4601          if Warn_On_Export_Import and Inside_A_Generic then
4602             Error_Msg_NE
4603               ("all instances of& will have the same external name?", Arg, E);
4604          end if;
4605       end Set_Exported;
4606
4607       ----------------------------------------------
4608       -- Set_Extended_Import_Export_External_Name --
4609       ----------------------------------------------
4610
4611       procedure Set_Extended_Import_Export_External_Name
4612         (Internal_Ent : Entity_Id;
4613          Arg_External : Node_Id)
4614       is
4615          Old_Name : constant Node_Id := Interface_Name (Internal_Ent);
4616          New_Name : Node_Id;
4617
4618       begin
4619          if No (Arg_External) then
4620             return;
4621          end if;
4622
4623          Check_Arg_Is_External_Name (Arg_External);
4624
4625          if Nkind (Arg_External) = N_String_Literal then
4626             if String_Length (Strval (Arg_External)) = 0 then
4627                return;
4628             else
4629                New_Name := Adjust_External_Name_Case (Arg_External);
4630             end if;
4631
4632          elsif Nkind (Arg_External) = N_Identifier then
4633             New_Name := Get_Default_External_Name (Arg_External);
4634
4635          --  Check_Arg_Is_External_Name should let through only identifiers and
4636          --  string literals or static string expressions (which are folded to
4637          --  string literals).
4638
4639          else
4640             raise Program_Error;
4641          end if;
4642
4643          --  If we already have an external name set (by a prior normal Import
4644          --  or Export pragma), then the external names must match
4645
4646          if Present (Interface_Name (Internal_Ent)) then
4647             Check_Matching_Internal_Names : declare
4648                S1 : constant String_Id := Strval (Old_Name);
4649                S2 : constant String_Id := Strval (New_Name);
4650
4651                procedure Mismatch;
4652                --  Called if names do not match
4653
4654                --------------
4655                -- Mismatch --
4656                --------------
4657
4658                procedure Mismatch is
4659                begin
4660                   Error_Msg_Sloc := Sloc (Old_Name);
4661                   Error_Pragma_Arg
4662                     ("external name does not match that given #",
4663                      Arg_External);
4664                end Mismatch;
4665
4666             --  Start of processing for Check_Matching_Internal_Names
4667
4668             begin
4669                if String_Length (S1) /= String_Length (S2) then
4670                   Mismatch;
4671
4672                else
4673                   for J in 1 .. String_Length (S1) loop
4674                      if Get_String_Char (S1, J) /= Get_String_Char (S2, J) then
4675                         Mismatch;
4676                      end if;
4677                   end loop;
4678                end if;
4679             end Check_Matching_Internal_Names;
4680
4681          --  Otherwise set the given name
4682
4683          else
4684             Set_Encoded_Interface_Name (Internal_Ent, New_Name);
4685             Check_Duplicated_Export_Name (New_Name);
4686          end if;
4687       end Set_Extended_Import_Export_External_Name;
4688
4689       ------------------
4690       -- Set_Imported --
4691       ------------------
4692
4693       procedure Set_Imported (E : Entity_Id) is
4694       begin
4695          --  Error message if already imported or exported
4696
4697          if Is_Exported (E) or else Is_Imported (E) then
4698             if Is_Exported (E) then
4699                Error_Msg_NE ("entity& was previously exported", N, E);
4700             else
4701                Error_Msg_NE ("entity& was previously imported", N, E);
4702             end if;
4703
4704             Error_Msg_Name_1 := Pname;
4705             Error_Msg_N
4706               ("\(pragma% applies to all previous entities)", N);
4707
4708             Error_Msg_Sloc  := Sloc (E);
4709             Error_Msg_NE ("\import not allowed for& declared#", N, E);
4710
4711          --  Here if not previously imported or exported, OK to import
4712
4713          else
4714             Set_Is_Imported (E);
4715
4716             --  If the entity is an object that is not at the library level,
4717             --  then it is statically allocated. We do not worry about objects
4718             --  with address clauses in this context since they are not really
4719             --  imported in the linker sense.
4720
4721             if Is_Object (E)
4722               and then not Is_Library_Level_Entity (E)
4723               and then No (Address_Clause (E))
4724             then
4725                Set_Is_Statically_Allocated (E);
4726             end if;
4727          end if;
4728       end Set_Imported;
4729
4730       -------------------------
4731       -- Set_Mechanism_Value --
4732       -------------------------
4733
4734       --  Note: the mechanism name has not been analyzed (and cannot indeed be
4735       --  analyzed, since it is semantic nonsense), so we get it in the exact
4736       --  form created by the parser.
4737
4738       procedure Set_Mechanism_Value (Ent : Entity_Id; Mech_Name : Node_Id) is
4739          Class : Node_Id;
4740          Param : Node_Id;
4741          Mech_Name_Id : Name_Id;
4742
4743          procedure Bad_Class;
4744          --  Signal bad descriptor class name
4745
4746          procedure Bad_Mechanism;
4747          --  Signal bad mechanism name
4748
4749          ---------------
4750          -- Bad_Class --
4751          ---------------
4752
4753          procedure Bad_Class is
4754          begin
4755             Error_Pragma_Arg ("unrecognized descriptor class name", Class);
4756          end Bad_Class;
4757
4758          -------------------------
4759          -- Bad_Mechanism_Value --
4760          -------------------------
4761
4762          procedure Bad_Mechanism is
4763          begin
4764             Error_Pragma_Arg ("unrecognized mechanism name", Mech_Name);
4765          end Bad_Mechanism;
4766
4767       --  Start of processing for Set_Mechanism_Value
4768
4769       begin
4770          if Mechanism (Ent) /= Default_Mechanism then
4771             Error_Msg_NE
4772               ("mechanism for & has already been set", Mech_Name, Ent);
4773          end if;
4774
4775          --  MECHANISM_NAME ::= value | reference | descriptor |
4776          --                     short_descriptor
4777
4778          if Nkind (Mech_Name) = N_Identifier then
4779             if Chars (Mech_Name) = Name_Value then
4780                Set_Mechanism (Ent, By_Copy);
4781                return;
4782
4783             elsif Chars (Mech_Name) = Name_Reference then
4784                Set_Mechanism (Ent, By_Reference);
4785                return;
4786
4787             elsif Chars (Mech_Name) = Name_Descriptor then
4788                Check_VMS (Mech_Name);
4789                Set_Mechanism (Ent, By_Descriptor);
4790                return;
4791
4792             elsif Chars (Mech_Name) = Name_Short_Descriptor then
4793                Check_VMS (Mech_Name);
4794                Set_Mechanism (Ent, By_Short_Descriptor);
4795                return;
4796
4797             elsif Chars (Mech_Name) = Name_Copy then
4798                Error_Pragma_Arg
4799                  ("bad mechanism name, Value assumed", Mech_Name);
4800
4801             else
4802                Bad_Mechanism;
4803             end if;
4804
4805          --  MECHANISM_NAME ::= descriptor (CLASS_NAME) |
4806          --                     short_descriptor (CLASS_NAME)
4807          --  CLASS_NAME     ::= ubs | ubsb | uba | s | sb | a | nca
4808
4809          --  Note: this form is parsed as an indexed component
4810
4811          elsif Nkind (Mech_Name) = N_Indexed_Component then
4812
4813             Class := First (Expressions (Mech_Name));
4814
4815             if Nkind (Prefix (Mech_Name)) /= N_Identifier
4816              or else not (Chars (Prefix (Mech_Name)) = Name_Descriptor or else
4817                           Chars (Prefix (Mech_Name)) = Name_Short_Descriptor)
4818              or else Present (Next (Class))
4819             then
4820                Bad_Mechanism;
4821             else
4822                Mech_Name_Id := Chars (Prefix (Mech_Name));
4823             end if;
4824
4825          --  MECHANISM_NAME ::= descriptor (Class => CLASS_NAME) |
4826          --                     short_descriptor (Class => CLASS_NAME)
4827          --  CLASS_NAME     ::= ubs | ubsb | uba | s | sb | a | nca
4828
4829          --  Note: this form is parsed as a function call
4830
4831          elsif Nkind (Mech_Name) = N_Function_Call then
4832
4833             Param := First (Parameter_Associations (Mech_Name));
4834
4835             if Nkind (Name (Mech_Name)) /= N_Identifier
4836               or else not (Chars (Name (Mech_Name)) = Name_Descriptor or else
4837                            Chars (Name (Mech_Name)) = Name_Short_Descriptor)
4838               or else Present (Next (Param))
4839               or else No (Selector_Name (Param))
4840               or else Chars (Selector_Name (Param)) /= Name_Class
4841             then
4842                Bad_Mechanism;
4843             else
4844                Class := Explicit_Actual_Parameter (Param);
4845                Mech_Name_Id := Chars (Name (Mech_Name));
4846             end if;
4847
4848          else
4849             Bad_Mechanism;
4850          end if;
4851
4852          --  Fall through here with Class set to descriptor class name
4853
4854          Check_VMS (Mech_Name);
4855
4856          if Nkind (Class) /= N_Identifier then
4857             Bad_Class;
4858
4859          elsif Mech_Name_Id = Name_Descriptor
4860                and then Chars (Class) = Name_UBS
4861          then
4862             Set_Mechanism (Ent, By_Descriptor_UBS);
4863
4864          elsif Mech_Name_Id = Name_Descriptor
4865                and then Chars (Class) = Name_UBSB
4866          then
4867             Set_Mechanism (Ent, By_Descriptor_UBSB);
4868
4869          elsif Mech_Name_Id = Name_Descriptor
4870                and then Chars (Class) = Name_UBA
4871          then
4872             Set_Mechanism (Ent, By_Descriptor_UBA);
4873
4874          elsif Mech_Name_Id = Name_Descriptor
4875                and then Chars (Class) = Name_S
4876          then
4877             Set_Mechanism (Ent, By_Descriptor_S);
4878
4879          elsif Mech_Name_Id = Name_Descriptor
4880                and then Chars (Class) = Name_SB
4881          then
4882             Set_Mechanism (Ent, By_Descriptor_SB);
4883
4884          elsif Mech_Name_Id = Name_Descriptor
4885                and then Chars (Class) = Name_A
4886          then
4887             Set_Mechanism (Ent, By_Descriptor_A);
4888
4889          elsif Mech_Name_Id = Name_Descriptor
4890                and then Chars (Class) = Name_NCA
4891          then
4892             Set_Mechanism (Ent, By_Descriptor_NCA);
4893
4894          elsif Mech_Name_Id = Name_Short_Descriptor
4895                and then Chars (Class) = Name_UBS
4896          then
4897             Set_Mechanism (Ent, By_Short_Descriptor_UBS);
4898
4899          elsif Mech_Name_Id = Name_Short_Descriptor
4900                and then Chars (Class) = Name_UBSB
4901          then
4902             Set_Mechanism (Ent, By_Short_Descriptor_UBSB);
4903
4904          elsif Mech_Name_Id = Name_Short_Descriptor
4905                and then Chars (Class) = Name_UBA
4906          then
4907             Set_Mechanism (Ent, By_Short_Descriptor_UBA);
4908
4909          elsif Mech_Name_Id = Name_Short_Descriptor
4910                and then Chars (Class) = Name_S
4911          then
4912             Set_Mechanism (Ent, By_Short_Descriptor_S);
4913
4914          elsif Mech_Name_Id = Name_Short_Descriptor
4915                and then Chars (Class) = Name_SB
4916          then
4917             Set_Mechanism (Ent, By_Short_Descriptor_SB);
4918
4919          elsif Mech_Name_Id = Name_Short_Descriptor
4920                and then Chars (Class) = Name_A
4921          then
4922             Set_Mechanism (Ent, By_Short_Descriptor_A);
4923
4924          elsif Mech_Name_Id = Name_Short_Descriptor
4925                and then Chars (Class) = Name_NCA
4926          then
4927             Set_Mechanism (Ent, By_Short_Descriptor_NCA);
4928
4929          else
4930             Bad_Class;
4931          end if;
4932       end Set_Mechanism_Value;
4933
4934       ---------------------------
4935       -- Set_Ravenscar_Profile --
4936       ---------------------------
4937
4938       --  The tasks to be done here are
4939
4940       --    Set required policies
4941
4942       --      pragma Task_Dispatching_Policy (FIFO_Within_Priorities)
4943       --      pragma Locking_Policy (Ceiling_Locking)
4944
4945       --    Set Detect_Blocking mode
4946
4947       --    Set required restrictions (see System.Rident for detailed list)
4948
4949       procedure Set_Ravenscar_Profile (N : Node_Id) is
4950       begin
4951          --  pragma Task_Dispatching_Policy (FIFO_Within_Priorities)
4952
4953          if Task_Dispatching_Policy /= ' '
4954            and then Task_Dispatching_Policy /= 'F'
4955          then
4956             Error_Msg_Sloc := Task_Dispatching_Policy_Sloc;
4957             Error_Pragma ("Profile (Ravenscar) incompatible with policy#");
4958
4959          --  Set the FIFO_Within_Priorities policy, but always preserve
4960          --  System_Location since we like the error message with the run time
4961          --  name.
4962
4963          else
4964             Task_Dispatching_Policy := 'F';
4965
4966             if Task_Dispatching_Policy_Sloc /= System_Location then
4967                Task_Dispatching_Policy_Sloc := Loc;
4968             end if;
4969          end if;
4970
4971          --  pragma Locking_Policy (Ceiling_Locking)
4972
4973          if Locking_Policy /= ' '
4974            and then Locking_Policy /= 'C'
4975          then
4976             Error_Msg_Sloc := Locking_Policy_Sloc;
4977             Error_Pragma ("Profile (Ravenscar) incompatible with policy#");
4978
4979          --  Set the Ceiling_Locking policy, but preserve System_Location since
4980          --  we like the error message with the run time name.
4981
4982          else
4983             Locking_Policy := 'C';
4984
4985             if Locking_Policy_Sloc /= System_Location then
4986                Locking_Policy_Sloc := Loc;
4987             end if;
4988          end if;
4989
4990          --  pragma Detect_Blocking
4991
4992          Detect_Blocking := True;
4993
4994          --  Set the corresponding restrictions
4995
4996          Set_Profile_Restrictions
4997            (Ravenscar, N, Warn => Treat_Restrictions_As_Warnings);
4998       end Set_Ravenscar_Profile;
4999
5000    --  Start of processing for Analyze_Pragma
5001
5002    begin
5003       --  Deal with unrecognized pragma
5004
5005       if not Is_Pragma_Name (Pname) then
5006          if Warn_On_Unrecognized_Pragma then
5007             Error_Msg_Name_1 := Pname;
5008             Error_Msg_N ("?unrecognized pragma%!", Pragma_Identifier (N));
5009
5010             for PN in First_Pragma_Name .. Last_Pragma_Name loop
5011                if Is_Bad_Spelling_Of (Pname, PN) then
5012                   Error_Msg_Name_1 := PN;
5013                   Error_Msg_N -- CODEFIX
5014                     ("\?possible misspelling of %!", Pragma_Identifier (N));
5015                   exit;
5016                end if;
5017             end loop;
5018          end if;
5019
5020          return;
5021       end if;
5022
5023       --  Here to start processing for recognized pragma
5024
5025       Prag_Id := Get_Pragma_Id (Pname);
5026
5027       --  Preset arguments
5028
5029       Arg1 := Empty;
5030       Arg2 := Empty;
5031       Arg3 := Empty;
5032       Arg4 := Empty;
5033
5034       if Present (Pragma_Argument_Associations (N)) then
5035          Arg1 := First (Pragma_Argument_Associations (N));
5036
5037          if Present (Arg1) then
5038             Arg2 := Next (Arg1);
5039
5040             if Present (Arg2) then
5041                Arg3 := Next (Arg2);
5042
5043                if Present (Arg3) then
5044                   Arg4 := Next (Arg3);
5045                end if;
5046             end if;
5047          end if;
5048       end if;
5049
5050       --  Count number of arguments
5051
5052       declare
5053          Arg_Node : Node_Id;
5054       begin
5055          Arg_Count := 0;
5056          Arg_Node := Arg1;
5057          while Present (Arg_Node) loop
5058             Arg_Count := Arg_Count + 1;
5059             Next (Arg_Node);
5060          end loop;
5061       end;
5062
5063       --  An enumeration type defines the pragmas that are supported by the
5064       --  implementation. Get_Pragma_Id (in package Prag) transforms a name
5065       --  into the corresponding enumeration value for the following case.
5066
5067       case Prag_Id is
5068
5069          -----------------
5070          -- Abort_Defer --
5071          -----------------
5072
5073          --  pragma Abort_Defer;
5074
5075          when Pragma_Abort_Defer =>
5076             GNAT_Pragma;
5077             Check_Arg_Count (0);
5078
5079             --  The only required semantic processing is to check the
5080             --  placement. This pragma must appear at the start of the
5081             --  statement sequence of a handled sequence of statements.
5082
5083             if Nkind (Parent (N)) /= N_Handled_Sequence_Of_Statements
5084               or else N /= First (Statements (Parent (N)))
5085             then
5086                Pragma_Misplaced;
5087             end if;
5088
5089          ------------
5090          -- Ada_83 --
5091          ------------
5092
5093          --  pragma Ada_83;
5094
5095          --  Note: this pragma also has some specific processing in Par.Prag
5096          --  because we want to set the Ada version mode during parsing.
5097
5098          when Pragma_Ada_83 =>
5099             GNAT_Pragma;
5100             Check_Arg_Count (0);
5101
5102             --  We really should check unconditionally for proper configuration
5103             --  pragma placement, since we really don't want mixed Ada modes
5104             --  within a single unit, and the GNAT reference manual has always
5105             --  said this was a configuration pragma, but we did not check and
5106             --  are hesitant to add the check now.
5107
5108             --  However, we really cannot tolerate mixing Ada 2005 with Ada 83
5109             --  or Ada 95, so we must check if we are in Ada 2005 mode.
5110
5111             if Ada_Version >= Ada_05 then
5112                Check_Valid_Configuration_Pragma;
5113             end if;
5114
5115             --  Now set Ada 83 mode
5116
5117             Ada_Version := Ada_83;
5118             Ada_Version_Explicit := Ada_Version;
5119
5120          ------------
5121          -- Ada_95 --
5122          ------------
5123
5124          --  pragma Ada_95;
5125
5126          --  Note: this pragma also has some specific processing in Par.Prag
5127          --  because we want to set the Ada 83 version mode during parsing.
5128
5129          when Pragma_Ada_95 =>
5130             GNAT_Pragma;
5131             Check_Arg_Count (0);
5132
5133             --  We really should check unconditionally for proper configuration
5134             --  pragma placement, since we really don't want mixed Ada modes
5135             --  within a single unit, and the GNAT reference manual has always
5136             --  said this was a configuration pragma, but we did not check and
5137             --  are hesitant to add the check now.
5138
5139             --  However, we really cannot tolerate mixing Ada 2005 with Ada 83
5140             --  or Ada 95, so we must check if we are in Ada 2005 mode.
5141
5142             if Ada_Version >= Ada_05 then
5143                Check_Valid_Configuration_Pragma;
5144             end if;
5145
5146             --  Now set Ada 95 mode
5147
5148             Ada_Version := Ada_95;
5149             Ada_Version_Explicit := Ada_Version;
5150
5151          ---------------------
5152          -- Ada_05/Ada_2005 --
5153          ---------------------
5154
5155          --  pragma Ada_05;
5156          --  pragma Ada_05 (LOCAL_NAME);
5157
5158          --  pragma Ada_2005;
5159          --  pragma Ada_2005 (LOCAL_NAME):
5160
5161          --  Note: these pragma also have some specific processing in Par.Prag
5162          --  because we want to set the Ada 2005 version mode during parsing.
5163
5164          when Pragma_Ada_05 | Pragma_Ada_2005 => declare
5165             E_Id : Node_Id;
5166
5167          begin
5168             GNAT_Pragma;
5169
5170             if Arg_Count = 1 then
5171                Check_Arg_Is_Local_Name (Arg1);
5172                E_Id := Expression (Arg1);
5173
5174                if Etype (E_Id) = Any_Type then
5175                   return;
5176                end if;
5177
5178                Set_Is_Ada_2005_Only (Entity (E_Id));
5179
5180             else
5181                Check_Arg_Count (0);
5182
5183                --  For Ada_2005 we unconditionally enforce the documented
5184                --  configuration pragma placement, since we do not want to
5185                --  tolerate mixed modes in a unit involving Ada 2005. That
5186                --  would cause real difficulties for those cases where there
5187                --  are incompatibilities between Ada 95 and Ada 2005.
5188
5189                Check_Valid_Configuration_Pragma;
5190
5191                --  Now set Ada 2005 mode
5192
5193                Ada_Version := Ada_05;
5194                Ada_Version_Explicit := Ada_05;
5195             end if;
5196          end;
5197
5198          ----------------------
5199          -- All_Calls_Remote --
5200          ----------------------
5201
5202          --  pragma All_Calls_Remote [(library_package_NAME)];
5203
5204          when Pragma_All_Calls_Remote => All_Calls_Remote : declare
5205             Lib_Entity : Entity_Id;
5206
5207          begin
5208             Check_Ada_83_Warning;
5209             Check_Valid_Library_Unit_Pragma;
5210
5211             if Nkind (N) = N_Null_Statement then
5212                return;
5213             end if;
5214
5215             Lib_Entity := Find_Lib_Unit_Name;
5216
5217             --  This pragma should only apply to a RCI unit (RM E.2.3(23))
5218
5219             if Present (Lib_Entity)
5220               and then not Debug_Flag_U
5221             then
5222                if not Is_Remote_Call_Interface (Lib_Entity) then
5223                   Error_Pragma ("pragma% only apply to rci unit");
5224
5225                --  Set flag for entity of the library unit
5226
5227                else
5228                   Set_Has_All_Calls_Remote (Lib_Entity);
5229                end if;
5230
5231             end if;
5232          end All_Calls_Remote;
5233
5234          --------------
5235          -- Annotate --
5236          --------------
5237
5238          --  pragma Annotate (IDENTIFIER [, IDENTIFIER {, ARG}]);
5239          --  ARG ::= NAME | EXPRESSION
5240
5241          --  The first two arguments are by convention intended to refer to an
5242          --  external tool and a tool-specific function. These arguments are
5243          --  not analyzed.
5244
5245          when Pragma_Annotate => Annotate : begin
5246             GNAT_Pragma;
5247             Check_At_Least_N_Arguments (1);
5248             Check_Arg_Is_Identifier (Arg1);
5249
5250             declare
5251                Arg : Node_Id;
5252                Exp : Node_Id;
5253
5254             begin
5255                --  Second unanalyzed parameter is optional
5256
5257                if No (Arg2) then
5258                   null;
5259                else
5260                   Arg := Next (Arg2);
5261                   while Present (Arg) loop
5262                      Exp := Expression (Arg);
5263                      Analyze (Exp);
5264
5265                      if Is_Entity_Name (Exp) then
5266                         null;
5267
5268                      elsif Nkind (Exp) = N_String_Literal then
5269                         Resolve (Exp, Standard_String);
5270
5271                      elsif Is_Overloaded (Exp) then
5272                            Error_Pragma_Arg
5273                              ("ambiguous argument for pragma%", Exp);
5274
5275                      else
5276                         Resolve (Exp);
5277                      end if;
5278
5279                      Next (Arg);
5280                   end loop;
5281                end if;
5282             end;
5283          end Annotate;
5284
5285          ------------
5286          -- Assert --
5287          ------------
5288
5289          --  pragma Assert ([Check =>] Boolean_EXPRESSION
5290          --                 [, [Message =>] Static_String_EXPRESSION]);
5291
5292          when Pragma_Assert => Assert : declare
5293             Expr : Node_Id;
5294             Newa : List_Id;
5295
5296          begin
5297             Ada_2005_Pragma;
5298             Check_At_Least_N_Arguments (1);
5299             Check_At_Most_N_Arguments (2);
5300             Check_Arg_Order ((Name_Check, Name_Message));
5301             Check_Optional_Identifier (Arg1, Name_Check);
5302
5303             --  We treat pragma Assert as equivalent to:
5304
5305             --    pragma Check (Assertion, condition [, msg]);
5306
5307             --  So rewrite pragma in this manner, and analyze the result
5308
5309             Expr := Get_Pragma_Arg (Arg1);
5310             Newa := New_List (
5311               Make_Pragma_Argument_Association (Loc,
5312                 Expression =>
5313                   Make_Identifier (Loc,
5314                     Chars => Name_Assertion)),
5315
5316               Make_Pragma_Argument_Association (Sloc (Expr),
5317                 Expression => Expr));
5318
5319             if Arg_Count > 1 then
5320                Check_Optional_Identifier (Arg2, Name_Message);
5321                Analyze_And_Resolve (Get_Pragma_Arg (Arg2), Standard_String);
5322                Append_To (Newa, Relocate_Node (Arg2));
5323             end if;
5324
5325             Rewrite (N,
5326               Make_Pragma (Loc,
5327                 Chars => Name_Check,
5328                 Pragma_Argument_Associations => Newa));
5329             Analyze (N);
5330          end Assert;
5331
5332          ----------------------
5333          -- Assertion_Policy --
5334          ----------------------
5335
5336          --  pragma Assertion_Policy (Check | Ignore)
5337
5338          when Pragma_Assertion_Policy => Assertion_Policy : declare
5339             Policy : Node_Id;
5340
5341          begin
5342             Ada_2005_Pragma;
5343             Check_Valid_Configuration_Pragma;
5344             Check_Arg_Count (1);
5345             Check_No_Identifiers;
5346             Check_Arg_Is_One_Of (Arg1, Name_Check, Name_Ignore);
5347
5348             --  We treat pragma Assertion_Policy as equivalent to:
5349
5350             --    pragma Check_Policy (Assertion, policy)
5351
5352             --  So rewrite the pragma in that manner and link on to the chain
5353             --  of Check_Policy pragmas, marking the pragma as analyzed.
5354
5355             Policy := Get_Pragma_Arg (Arg1);
5356
5357             Rewrite (N,
5358               Make_Pragma (Loc,
5359                 Chars => Name_Check_Policy,
5360
5361                 Pragma_Argument_Associations => New_List (
5362                   Make_Pragma_Argument_Association (Loc,
5363                     Expression =>
5364                       Make_Identifier (Loc,
5365                         Chars => Name_Assertion)),
5366
5367                   Make_Pragma_Argument_Association (Loc,
5368                     Expression =>
5369                       Make_Identifier (Sloc (Policy),
5370                         Chars => Chars (Policy))))));
5371
5372             Set_Analyzed (N);
5373             Set_Next_Pragma (N, Opt.Check_Policy_List);
5374             Opt.Check_Policy_List := N;
5375          end Assertion_Policy;
5376
5377          ------------------------------
5378          -- Assume_No_Invalid_Values --
5379          ------------------------------
5380
5381          --  pragma Assume_No_Invalid_Values (On | Off);
5382
5383          when Pragma_Assume_No_Invalid_Values =>
5384             GNAT_Pragma;
5385             Check_Valid_Configuration_Pragma;
5386             Check_Arg_Count (1);
5387             Check_No_Identifiers;
5388             Check_Arg_Is_One_Of (Arg1, Name_On, Name_Off);
5389
5390             if Chars (Expression (Arg1)) = Name_On then
5391                Assume_No_Invalid_Values := True;
5392             else
5393                Assume_No_Invalid_Values := False;
5394             end if;
5395
5396          ---------------
5397          -- AST_Entry --
5398          ---------------
5399
5400          --  pragma AST_Entry (entry_IDENTIFIER);
5401
5402          when Pragma_AST_Entry => AST_Entry : declare
5403             Ent : Node_Id;
5404
5405          begin
5406             GNAT_Pragma;
5407             Check_VMS (N);
5408             Check_Arg_Count (1);
5409             Check_No_Identifiers;
5410             Check_Arg_Is_Local_Name (Arg1);
5411             Ent := Entity (Expression (Arg1));
5412
5413             --  Note: the implementation of the AST_Entry pragma could handle
5414             --  the entry family case fine, but for now we are consistent with
5415             --  the DEC rules, and do not allow the pragma, which of course
5416             --  has the effect of also forbidding the attribute.
5417
5418             if Ekind (Ent) /= E_Entry then
5419                Error_Pragma_Arg
5420                  ("pragma% argument must be simple entry name", Arg1);
5421
5422             elsif Is_AST_Entry (Ent) then
5423                Error_Pragma_Arg
5424                  ("duplicate % pragma for entry", Arg1);
5425
5426             elsif Has_Homonym (Ent) then
5427                Error_Pragma_Arg
5428                  ("pragma% argument cannot specify overloaded entry", Arg1);
5429
5430             else
5431                declare
5432                   FF : constant Entity_Id := First_Formal (Ent);
5433
5434                begin
5435                   if Present (FF) then
5436                      if Present (Next_Formal (FF)) then
5437                         Error_Pragma_Arg
5438                           ("entry for pragma% can have only one argument",
5439                            Arg1);
5440
5441                      elsif Parameter_Mode (FF) /= E_In_Parameter then
5442                         Error_Pragma_Arg
5443                           ("entry parameter for pragma% must have mode IN",
5444                            Arg1);
5445                      end if;
5446                   end if;
5447                end;
5448
5449                Set_Is_AST_Entry (Ent);
5450             end if;
5451          end AST_Entry;
5452
5453          ------------------
5454          -- Asynchronous --
5455          ------------------
5456
5457          --  pragma Asynchronous (LOCAL_NAME);
5458
5459          when Pragma_Asynchronous => Asynchronous : declare
5460             Nm     : Entity_Id;
5461             C_Ent  : Entity_Id;
5462             L      : List_Id;
5463             S      : Node_Id;
5464             N      : Node_Id;
5465             Formal : Entity_Id;
5466
5467             procedure Process_Async_Pragma;
5468             --  Common processing for procedure and access-to-procedure case
5469
5470             --------------------------
5471             -- Process_Async_Pragma --
5472             --------------------------
5473
5474             procedure Process_Async_Pragma is
5475             begin
5476                if No (L) then
5477                   Set_Is_Asynchronous (Nm);
5478                   return;
5479                end if;
5480
5481                --  The formals should be of mode IN (RM E.4.1(6))
5482
5483                S := First (L);
5484                while Present (S) loop
5485                   Formal := Defining_Identifier (S);
5486
5487                   if Nkind (Formal) = N_Defining_Identifier
5488                     and then Ekind (Formal) /= E_In_Parameter
5489                   then
5490                      Error_Pragma_Arg
5491                        ("pragma% procedure can only have IN parameter",
5492                         Arg1);
5493                   end if;
5494
5495                   Next (S);
5496                end loop;
5497
5498                Set_Is_Asynchronous (Nm);
5499             end Process_Async_Pragma;
5500
5501          --  Start of processing for pragma Asynchronous
5502
5503          begin
5504             Check_Ada_83_Warning;
5505             Check_No_Identifiers;
5506             Check_Arg_Count (1);
5507             Check_Arg_Is_Local_Name (Arg1);
5508
5509             if Debug_Flag_U then
5510                return;
5511             end if;
5512
5513             C_Ent := Cunit_Entity (Current_Sem_Unit);
5514             Analyze (Expression (Arg1));
5515             Nm := Entity (Expression (Arg1));
5516
5517             if not Is_Remote_Call_Interface (C_Ent)
5518               and then not Is_Remote_Types (C_Ent)
5519             then
5520                --  This pragma should only appear in an RCI or Remote Types
5521                --  unit (RM E.4.1(4)).
5522
5523                Error_Pragma
5524                  ("pragma% not in Remote_Call_Interface or " &
5525                   "Remote_Types unit");
5526             end if;
5527
5528             if Ekind (Nm) = E_Procedure
5529               and then Nkind (Parent (Nm)) = N_Procedure_Specification
5530             then
5531                if not Is_Remote_Call_Interface (Nm) then
5532                   Error_Pragma_Arg
5533                     ("pragma% cannot be applied on non-remote procedure",
5534                      Arg1);
5535                end if;
5536
5537                L := Parameter_Specifications (Parent (Nm));
5538                Process_Async_Pragma;
5539                return;
5540
5541             elsif Ekind (Nm) = E_Function then
5542                Error_Pragma_Arg
5543                  ("pragma% cannot be applied to function", Arg1);
5544
5545             elsif Is_Remote_Access_To_Subprogram_Type (Nm) then
5546
5547                   if Is_Record_Type (Nm) then
5548
5549                   --  A record type that is the Equivalent_Type for a remote
5550                   --  access-to-subprogram type.
5551
5552                      N := Declaration_Node (Corresponding_Remote_Type (Nm));
5553
5554                   else
5555                      --  A non-expanded RAS type (distribution is not enabled)
5556
5557                      N := Declaration_Node (Nm);
5558                   end if;
5559
5560                if Nkind (N) = N_Full_Type_Declaration
5561                  and then Nkind (Type_Definition (N)) =
5562                                      N_Access_Procedure_Definition
5563                then
5564                   L := Parameter_Specifications (Type_Definition (N));
5565                   Process_Async_Pragma;
5566
5567                   if Is_Asynchronous (Nm)
5568                     and then Expander_Active
5569                     and then Get_PCS_Name /= Name_No_DSA
5570                   then
5571                      RACW_Type_Is_Asynchronous (Underlying_RACW_Type (Nm));
5572                   end if;
5573
5574                else
5575                   Error_Pragma_Arg
5576                     ("pragma% cannot reference access-to-function type",
5577                     Arg1);
5578                end if;
5579
5580             --  Only other possibility is Access-to-class-wide type
5581
5582             elsif Is_Access_Type (Nm)
5583               and then Is_Class_Wide_Type (Designated_Type (Nm))
5584             then
5585                Check_First_Subtype (Arg1);
5586                Set_Is_Asynchronous (Nm);
5587                if Expander_Active then
5588                   RACW_Type_Is_Asynchronous (Nm);
5589                end if;
5590
5591             else
5592                Error_Pragma_Arg ("inappropriate argument for pragma%", Arg1);
5593             end if;
5594          end Asynchronous;
5595
5596          ------------
5597          -- Atomic --
5598          ------------
5599
5600          --  pragma Atomic (LOCAL_NAME);
5601
5602          when Pragma_Atomic =>
5603             Process_Atomic_Shared_Volatile;
5604
5605          -----------------------
5606          -- Atomic_Components --
5607          -----------------------
5608
5609          --  pragma Atomic_Components (array_LOCAL_NAME);
5610
5611          --  This processing is shared by Volatile_Components
5612
5613          when Pragma_Atomic_Components   |
5614               Pragma_Volatile_Components =>
5615
5616          Atomic_Components : declare
5617             E_Id : Node_Id;
5618             E    : Entity_Id;
5619             D    : Node_Id;
5620             K    : Node_Kind;
5621
5622          begin
5623             Check_Ada_83_Warning;
5624             Check_No_Identifiers;
5625             Check_Arg_Count (1);
5626             Check_Arg_Is_Local_Name (Arg1);
5627             E_Id := Expression (Arg1);
5628
5629             if Etype (E_Id) = Any_Type then
5630                return;
5631             end if;
5632
5633             E := Entity (E_Id);
5634
5635             if Rep_Item_Too_Early (E, N)
5636                  or else
5637                Rep_Item_Too_Late (E, N)
5638             then
5639                return;
5640             end if;
5641
5642             D := Declaration_Node (E);
5643             K := Nkind (D);
5644
5645             if (K = N_Full_Type_Declaration and then Is_Array_Type (E))
5646               or else
5647                 ((Ekind (E) = E_Constant or else Ekind (E) = E_Variable)
5648                    and then Nkind (D) = N_Object_Declaration
5649                    and then Nkind (Object_Definition (D)) =
5650                                        N_Constrained_Array_Definition)
5651             then
5652                --  The flag is set on the object, or on the base type
5653
5654                if Nkind (D) /= N_Object_Declaration then
5655                   E := Base_Type (E);
5656                end if;
5657
5658                Set_Has_Volatile_Components (E);
5659
5660                if Prag_Id = Pragma_Atomic_Components then
5661                   Set_Has_Atomic_Components (E);
5662
5663                   if Is_Packed (E) then
5664                      Set_Is_Packed (E, False);
5665
5666                      Error_Pragma_Arg
5667                        ("?Pack canceled, cannot pack atomic components",
5668                         Arg1);
5669                   end if;
5670                end if;
5671
5672             else
5673                Error_Pragma_Arg ("inappropriate entity for pragma%", Arg1);
5674             end if;
5675          end Atomic_Components;
5676
5677          --------------------
5678          -- Attach_Handler --
5679          --------------------
5680
5681          --  pragma Attach_Handler (handler_NAME, EXPRESSION);
5682
5683          when Pragma_Attach_Handler =>
5684             Check_Ada_83_Warning;
5685             Check_No_Identifiers;
5686             Check_Arg_Count (2);
5687
5688             if No_Run_Time_Mode then
5689                Error_Msg_CRT ("Attach_Handler pragma", N);
5690             else
5691                Check_Interrupt_Or_Attach_Handler;
5692
5693                --  The expression that designates the attribute may
5694                --  depend on a discriminant, and is therefore a per-
5695                --  object expression, to be expanded in the init proc.
5696                --  If expansion is enabled, perform semantic checks
5697                --  on a copy only.
5698
5699                if Expander_Active then
5700                   declare
5701                      Temp : constant Node_Id :=
5702                               New_Copy_Tree (Expression (Arg2));
5703                   begin
5704                      Set_Parent (Temp, N);
5705                      Preanalyze_And_Resolve (Temp, RTE (RE_Interrupt_ID));
5706                   end;
5707
5708                else
5709                   Analyze (Expression (Arg2));
5710                   Resolve (Expression (Arg2), RTE (RE_Interrupt_ID));
5711                end if;
5712
5713                Process_Interrupt_Or_Attach_Handler;
5714             end if;
5715
5716          --------------------
5717          -- C_Pass_By_Copy --
5718          --------------------
5719
5720          --  pragma C_Pass_By_Copy ([Max_Size =>] static_integer_EXPRESSION);
5721
5722          when Pragma_C_Pass_By_Copy => C_Pass_By_Copy : declare
5723             Arg : Node_Id;
5724             Val : Uint;
5725
5726          begin
5727             GNAT_Pragma;
5728             Check_Valid_Configuration_Pragma;
5729             Check_Arg_Count (1);
5730             Check_Optional_Identifier (Arg1, "max_size");
5731
5732             Arg := Expression (Arg1);
5733             Check_Arg_Is_Static_Expression (Arg, Any_Integer);
5734
5735             Val := Expr_Value (Arg);
5736
5737             if Val <= 0 then
5738                Error_Pragma_Arg
5739                  ("maximum size for pragma% must be positive", Arg1);
5740
5741             elsif UI_Is_In_Int_Range (Val) then
5742                Default_C_Record_Mechanism := UI_To_Int (Val);
5743
5744             --  If a giant value is given, Int'Last will do well enough.
5745             --  If sometime someone complains that a record larger than
5746             --  two gigabytes is not copied, we will worry about it then!
5747
5748             else
5749                Default_C_Record_Mechanism := Mechanism_Type'Last;
5750             end if;
5751          end C_Pass_By_Copy;
5752
5753          -----------
5754          -- Check --
5755          -----------
5756
5757          --  pragma Check ([Name    =>] Identifier,
5758          --                [Check   =>] Boolean_Expression
5759          --              [,[Message =>] String_Expression]);
5760
5761          when Pragma_Check => Check : declare
5762             Expr : Node_Id;
5763             Eloc : Source_Ptr;
5764
5765             Check_On : Boolean;
5766             --  Set True if category of assertions referenced by Name enabled
5767
5768          begin
5769             GNAT_Pragma;
5770             Check_At_Least_N_Arguments (2);
5771             Check_At_Most_N_Arguments (3);
5772             Check_Optional_Identifier (Arg1, Name_Name);
5773             Check_Optional_Identifier (Arg2, Name_Check);
5774
5775             if Arg_Count = 3 then
5776                Check_Optional_Identifier (Arg3, Name_Message);
5777                Analyze_And_Resolve (Get_Pragma_Arg (Arg3), Standard_String);
5778             end if;
5779
5780             Check_Arg_Is_Identifier (Arg1);
5781             Check_On := Check_Enabled (Chars (Get_Pragma_Arg (Arg1)));
5782
5783             --  If expansion is active and the check is not enabled then we
5784             --  rewrite the Check as:
5785
5786             --    if False and then condition then
5787             --       null;
5788             --    end if;
5789
5790             --  The reason we do this rewriting during semantic analysis rather
5791             --  than as part of normal expansion is that we cannot analyze and
5792             --  expand the code for the boolean expression directly, or it may
5793             --  cause insertion of actions that would escape the attempt to
5794             --  suppress the check code.
5795
5796             --  Note that the Sloc for the if statement corresponds to the
5797             --  argument condition, not the pragma itself. The reason for this
5798             --  is that we may generate a warning if the condition is False at
5799             --  compile time, and we do not want to delete this warning when we
5800             --  delete the if statement.
5801
5802             Expr := Expression (Arg2);
5803
5804             if Expander_Active and then not Check_On then
5805                Eloc := Sloc (Expr);
5806
5807                Rewrite (N,
5808                  Make_If_Statement (Eloc,
5809                    Condition =>
5810                      Make_And_Then (Eloc,
5811                        Left_Opnd  => New_Occurrence_Of (Standard_False, Eloc),
5812                        Right_Opnd => Expr),
5813                    Then_Statements => New_List (
5814                      Make_Null_Statement (Eloc))));
5815
5816                Analyze (N);
5817
5818             --  Check is active
5819
5820             else
5821                Analyze_And_Resolve (Expr, Any_Boolean);
5822             end if;
5823          end Check;
5824
5825          ----------------
5826          -- Check_Name --
5827          ----------------
5828
5829          --  pragma Check_Name (check_IDENTIFIER);
5830
5831          when Pragma_Check_Name =>
5832             Check_No_Identifiers;
5833             GNAT_Pragma;
5834             Check_Valid_Configuration_Pragma;
5835             Check_Arg_Count (1);
5836             Check_Arg_Is_Identifier (Arg1);
5837
5838             declare
5839                Nam : constant Name_Id := Chars (Expression (Arg1));
5840
5841             begin
5842                for J in Check_Names.First .. Check_Names.Last loop
5843                   if Check_Names.Table (J) = Nam then
5844                      return;
5845                   end if;
5846                end loop;
5847
5848                Check_Names.Append (Nam);
5849             end;
5850
5851          ------------------
5852          -- Check_Policy --
5853          ------------------
5854
5855          --  pragma Check_Policy (
5856          --    [Name   =>] IDENTIFIER,
5857          --    [Policy =>] POLICY_IDENTIFIER);
5858
5859          --  POLICY_IDENTIFIER ::= ON | OFF | CHECK | IGNORE
5860
5861          --  Note: this is a configuration pragma, but it is allowed to appear
5862          --  anywhere else.
5863
5864          when Pragma_Check_Policy =>
5865             GNAT_Pragma;
5866             Check_Arg_Count (2);
5867             Check_Optional_Identifier (Arg1, Name_Name);
5868             Check_Optional_Identifier (Arg2, Name_Policy);
5869             Check_Arg_Is_One_Of
5870               (Arg2, Name_On, Name_Off, Name_Check, Name_Ignore);
5871
5872             --  A Check_Policy pragma can appear either as a configuration
5873             --  pragma, or in a declarative part or a package spec (see RM
5874             --  11.5(5) for rules for Suppress/Unsuppress which are also
5875             --  followed for Check_Policy).
5876
5877             if not Is_Configuration_Pragma then
5878                Check_Is_In_Decl_Part_Or_Package_Spec;
5879             end if;
5880
5881             Set_Next_Pragma (N, Opt.Check_Policy_List);
5882             Opt.Check_Policy_List := N;
5883
5884          ---------------------
5885          -- CIL_Constructor --
5886          ---------------------
5887
5888          --  pragma CIL_Constructor ([Entity =>] LOCAL_NAME);
5889
5890          --  Processing for this pragma is shared with Java_Constructor
5891
5892          -------------
5893          -- Comment --
5894          -------------
5895
5896          --  pragma Comment (static_string_EXPRESSION)
5897
5898          --  Processing for pragma Comment shares the circuitry for pragma
5899          --  Ident. The only differences are that Ident enforces a limit of 31
5900          --  characters on its argument, and also enforces limitations on
5901          --  placement for DEC compatibility. Pragma Comment shares neither of
5902          --  these restrictions.
5903
5904          -------------------
5905          -- Common_Object --
5906          -------------------
5907
5908          --  pragma Common_Object (
5909          --        [Internal =>] LOCAL_NAME
5910          --     [, [External =>] EXTERNAL_SYMBOL]
5911          --     [, [Size     =>] EXTERNAL_SYMBOL]);
5912
5913          --  Processing for this pragma is shared with Psect_Object
5914
5915          ------------------------
5916          -- Compile_Time_Error --
5917          ------------------------
5918
5919          --  pragma Compile_Time_Error
5920          --    (boolean_EXPRESSION, static_string_EXPRESSION);
5921
5922          when Pragma_Compile_Time_Error =>
5923             GNAT_Pragma;
5924             Process_Compile_Time_Warning_Or_Error;
5925
5926          --------------------------
5927          -- Compile_Time_Warning --
5928          --------------------------
5929
5930          --  pragma Compile_Time_Warning
5931          --    (boolean_EXPRESSION, static_string_EXPRESSION);
5932
5933          when Pragma_Compile_Time_Warning =>
5934             GNAT_Pragma;
5935             Process_Compile_Time_Warning_Or_Error;
5936
5937          -------------------
5938          -- Compiler_Unit --
5939          -------------------
5940
5941          when Pragma_Compiler_Unit =>
5942             GNAT_Pragma;
5943             Check_Arg_Count (0);
5944             Set_Is_Compiler_Unit (Get_Source_Unit (N));
5945
5946          -----------------------------
5947          -- Complete_Representation --
5948          -----------------------------
5949
5950          --  pragma Complete_Representation;
5951
5952          when Pragma_Complete_Representation =>
5953             GNAT_Pragma;
5954             Check_Arg_Count (0);
5955
5956             if Nkind (Parent (N)) /= N_Record_Representation_Clause then
5957                Error_Pragma
5958                  ("pragma & must appear within record representation clause");
5959             end if;
5960
5961          ----------------------------
5962          -- Complex_Representation --
5963          ----------------------------
5964
5965          --  pragma Complex_Representation ([Entity =>] LOCAL_NAME);
5966
5967          when Pragma_Complex_Representation => Complex_Representation : declare
5968             E_Id : Entity_Id;
5969             E    : Entity_Id;
5970             Ent  : Entity_Id;
5971
5972          begin
5973             GNAT_Pragma;
5974             Check_Arg_Count (1);
5975             Check_Optional_Identifier (Arg1, Name_Entity);
5976             Check_Arg_Is_Local_Name (Arg1);
5977             E_Id := Expression (Arg1);
5978
5979             if Etype (E_Id) = Any_Type then
5980                return;
5981             end if;
5982
5983             E := Entity (E_Id);
5984
5985             if not Is_Record_Type (E) then
5986                Error_Pragma_Arg
5987                  ("argument for pragma% must be record type", Arg1);
5988             end if;
5989
5990             Ent := First_Entity (E);
5991
5992             if No (Ent)
5993               or else No (Next_Entity (Ent))
5994               or else Present (Next_Entity (Next_Entity (Ent)))
5995               or else not Is_Floating_Point_Type (Etype (Ent))
5996               or else Etype (Ent) /= Etype (Next_Entity (Ent))
5997             then
5998                Error_Pragma_Arg
5999                  ("record for pragma% must have two fields of the same "
6000                   & "floating-point type", Arg1);
6001
6002             else
6003                Set_Has_Complex_Representation (Base_Type (E));
6004
6005                --  We need to treat the type has having a non-standard
6006                --  representation, for back-end purposes, even though in
6007                --  general a complex will have the default representation
6008                --  of a record with two real components.
6009
6010                Set_Has_Non_Standard_Rep (Base_Type (E));
6011             end if;
6012          end Complex_Representation;
6013
6014          -------------------------
6015          -- Component_Alignment --
6016          -------------------------
6017
6018          --  pragma Component_Alignment (
6019          --        [Form =>] ALIGNMENT_CHOICE
6020          --     [, [Name =>] type_LOCAL_NAME]);
6021          --
6022          --   ALIGNMENT_CHOICE ::=
6023          --     Component_Size
6024          --   | Component_Size_4
6025          --   | Storage_Unit
6026          --   | Default
6027
6028          when Pragma_Component_Alignment => Component_AlignmentP : declare
6029             Args  : Args_List (1 .. 2);
6030             Names : constant Name_List (1 .. 2) := (
6031                       Name_Form,
6032                       Name_Name);
6033
6034             Form  : Node_Id renames Args (1);
6035             Name  : Node_Id renames Args (2);
6036
6037             Atype : Component_Alignment_Kind;
6038             Typ   : Entity_Id;
6039
6040          begin
6041             GNAT_Pragma;
6042             Gather_Associations (Names, Args);
6043
6044             if No (Form) then
6045                Error_Pragma ("missing Form argument for pragma%");
6046             end if;
6047
6048             Check_Arg_Is_Identifier (Form);
6049
6050             --  Get proper alignment, note that Default = Component_Size on all
6051             --  machines we have so far, and we want to set this value rather
6052             --  than the default value to indicate that it has been explicitly
6053             --  set (and thus will not get overridden by the default component
6054             --  alignment for the current scope)
6055
6056             if Chars (Form) = Name_Component_Size then
6057                Atype := Calign_Component_Size;
6058
6059             elsif Chars (Form) = Name_Component_Size_4 then
6060                Atype := Calign_Component_Size_4;
6061
6062             elsif Chars (Form) = Name_Default then
6063                Atype := Calign_Component_Size;
6064
6065             elsif Chars (Form) = Name_Storage_Unit then
6066                Atype := Calign_Storage_Unit;
6067
6068             else
6069                Error_Pragma_Arg
6070                  ("invalid Form parameter for pragma%", Form);
6071             end if;
6072
6073             --  Case with no name, supplied, affects scope table entry
6074
6075             if No (Name) then
6076                Scope_Stack.Table
6077                  (Scope_Stack.Last).Component_Alignment_Default := Atype;
6078
6079             --  Case of name supplied
6080
6081             else
6082                Check_Arg_Is_Local_Name (Name);
6083                Find_Type (Name);
6084                Typ := Entity (Name);
6085
6086                if Typ = Any_Type
6087                  or else Rep_Item_Too_Early (Typ, N)
6088                then
6089                   return;
6090                else
6091                   Typ := Underlying_Type (Typ);
6092                end if;
6093
6094                if not Is_Record_Type (Typ)
6095                  and then not Is_Array_Type (Typ)
6096                then
6097                   Error_Pragma_Arg
6098                     ("Name parameter of pragma% must identify record or " &
6099                      "array type", Name);
6100                end if;
6101
6102                --  An explicit Component_Alignment pragma overrides an
6103                --  implicit pragma Pack, but not an explicit one.
6104
6105                if not Has_Pragma_Pack (Base_Type (Typ)) then
6106                   Set_Is_Packed (Base_Type (Typ), False);
6107                   Set_Component_Alignment (Base_Type (Typ), Atype);
6108                end if;
6109             end if;
6110          end Component_AlignmentP;
6111
6112          ----------------
6113          -- Controlled --
6114          ----------------
6115
6116          --  pragma Controlled (first_subtype_LOCAL_NAME);
6117
6118          when Pragma_Controlled => Controlled : declare
6119             Arg : Node_Id;
6120
6121          begin
6122             Check_No_Identifiers;
6123             Check_Arg_Count (1);
6124             Check_Arg_Is_Local_Name (Arg1);
6125             Arg := Expression (Arg1);
6126
6127             if not Is_Entity_Name (Arg)
6128               or else not Is_Access_Type (Entity (Arg))
6129             then
6130                Error_Pragma_Arg ("pragma% requires access type", Arg1);
6131             else
6132                Set_Has_Pragma_Controlled (Base_Type (Entity (Arg)));
6133             end if;
6134          end Controlled;
6135
6136          ----------------
6137          -- Convention --
6138          ----------------
6139
6140          --  pragma Convention ([Convention =>] convention_IDENTIFIER,
6141          --    [Entity =>] LOCAL_NAME);
6142
6143          when Pragma_Convention => Convention : declare
6144             C : Convention_Id;
6145             E : Entity_Id;
6146             pragma Warnings (Off, C);
6147             pragma Warnings (Off, E);
6148          begin
6149             Check_Arg_Order ((Name_Convention, Name_Entity));
6150             Check_Ada_83_Warning;
6151             Check_Arg_Count (2);
6152             Process_Convention (C, E);
6153          end Convention;
6154
6155          ---------------------------
6156          -- Convention_Identifier --
6157          ---------------------------
6158
6159          --  pragma Convention_Identifier ([Name =>] IDENTIFIER,
6160          --    [Convention =>] convention_IDENTIFIER);
6161
6162          when Pragma_Convention_Identifier => Convention_Identifier : declare
6163             Idnam : Name_Id;
6164             Cname : Name_Id;
6165
6166          begin
6167             GNAT_Pragma;
6168             Check_Arg_Order ((Name_Name, Name_Convention));
6169             Check_Arg_Count (2);
6170             Check_Optional_Identifier (Arg1, Name_Name);
6171             Check_Optional_Identifier (Arg2, Name_Convention);
6172             Check_Arg_Is_Identifier (Arg1);
6173             Check_Arg_Is_Identifier (Arg2);
6174             Idnam := Chars (Expression (Arg1));
6175             Cname := Chars (Expression (Arg2));
6176
6177             if Is_Convention_Name (Cname) then
6178                Record_Convention_Identifier
6179                  (Idnam, Get_Convention_Id (Cname));
6180             else
6181                Error_Pragma_Arg
6182                  ("second arg for % pragma must be convention", Arg2);
6183             end if;
6184          end Convention_Identifier;
6185
6186          ---------------
6187          -- CPP_Class --
6188          ---------------
6189
6190          --  pragma CPP_Class ([Entity =>] local_NAME)
6191
6192          when Pragma_CPP_Class => CPP_Class : declare
6193             Arg : Node_Id;
6194             Typ : Entity_Id;
6195
6196          begin
6197             if Warn_On_Obsolescent_Feature then
6198                Error_Msg_N
6199                  ("'G'N'A'T pragma cpp'_class is now obsolete; replace it" &
6200                   " by pragma import?", N);
6201             end if;
6202
6203             GNAT_Pragma;
6204             Check_Arg_Count (1);
6205             Check_Optional_Identifier (Arg1, Name_Entity);
6206             Check_Arg_Is_Local_Name (Arg1);
6207
6208             Arg := Expression (Arg1);
6209             Analyze (Arg);
6210
6211             if Etype (Arg) = Any_Type then
6212                return;
6213             end if;
6214
6215             if not Is_Entity_Name (Arg)
6216               or else not Is_Type (Entity (Arg))
6217             then
6218                Error_Pragma_Arg ("pragma% requires a type mark", Arg1);
6219             end if;
6220
6221             Typ := Entity (Arg);
6222
6223             if not Is_Tagged_Type (Typ) then
6224                Error_Pragma_Arg ("pragma% applicable to tagged types ", Arg1);
6225             end if;
6226
6227             --  Types treated as CPP classes are treated as limited, but we
6228             --  don't require them to be declared this way. A warning is issued
6229             --  to encourage the user to declare them as limited. This is not
6230             --  an error, for compatibility reasons, because these types have
6231             --  been supported this way for some time.
6232
6233             if not Is_Limited_Type (Typ) then
6234                Error_Msg_N
6235                  ("imported 'C'P'P type should be " &
6236                     "explicitly declared limited?",
6237                   Get_Pragma_Arg (Arg1));
6238                Error_Msg_N
6239                  ("\type will be considered limited",
6240                   Get_Pragma_Arg (Arg1));
6241             end if;
6242
6243             Set_Is_CPP_Class      (Typ);
6244             Set_Is_Limited_Record (Typ);
6245             Set_Convention        (Typ, Convention_CPP);
6246
6247             --  Imported CPP types must not have discriminants (because C++
6248             --  classes do not have discriminants).
6249
6250             if Has_Discriminants (Typ) then
6251                Error_Msg_N
6252                  ("imported 'C'P'P type cannot have discriminants",
6253                   First (Discriminant_Specifications
6254                           (Declaration_Node (Typ))));
6255             end if;
6256
6257             --  Components of imported CPP types must not have default
6258             --  expressions because the constructor (if any) is in the
6259             --  C++ side.
6260
6261             if Is_Incomplete_Or_Private_Type (Typ)
6262               and then No (Underlying_Type (Typ))
6263             then
6264                --  It should be an error to apply pragma CPP to a private
6265                --  type if the underlying type is not visible (as it is
6266                --  for any representation item). For now, for backward
6267                --  compatibility we do nothing but we cannot check components
6268                --  because they are not available at this stage. All this code
6269                --  will be removed when we cleanup this obsolete GNAT pragma???
6270
6271                null;
6272
6273             else
6274                declare
6275                   Tdef  : constant Node_Id :=
6276                             Type_Definition (Declaration_Node (Typ));
6277                   Clist : Node_Id;
6278                   Comp  : Node_Id;
6279
6280                begin
6281                   if Nkind (Tdef) = N_Record_Definition then
6282                      Clist := Component_List (Tdef);
6283                   else
6284                      pragma Assert (Nkind (Tdef) = N_Derived_Type_Definition);
6285                      Clist := Component_List (Record_Extension_Part (Tdef));
6286                   end if;
6287
6288                   if Present (Clist) then
6289                      Comp := First (Component_Items (Clist));
6290                      while Present (Comp) loop
6291                         if Present (Expression (Comp)) then
6292                            Error_Msg_N
6293                              ("component of imported 'C'P'P type cannot have" &
6294                               " default expression", Expression (Comp));
6295                         end if;
6296
6297                         Next (Comp);
6298                      end loop;
6299                   end if;
6300                end;
6301             end if;
6302          end CPP_Class;
6303
6304          ---------------------
6305          -- CPP_Constructor --
6306          ---------------------
6307
6308          --  pragma CPP_Constructor ([Entity =>] LOCAL_NAME
6309          --    [, [External_Name =>] static_string_EXPRESSION ]
6310          --    [, [Link_Name     =>] static_string_EXPRESSION ]);
6311
6312          when Pragma_CPP_Constructor => CPP_Constructor : declare
6313             Elmt    : Elmt_Id;
6314             Id      : Entity_Id;
6315             Def_Id  : Entity_Id;
6316             Tag_Typ : Entity_Id;
6317
6318          begin
6319             GNAT_Pragma;
6320             Check_At_Least_N_Arguments (1);
6321             Check_At_Most_N_Arguments (3);
6322             Check_Optional_Identifier (Arg1, Name_Entity);
6323             Check_Arg_Is_Local_Name (Arg1);
6324
6325             Id := Expression (Arg1);
6326             Find_Program_Unit_Name (Id);
6327
6328             --  If we did not find the name, we are done
6329
6330             if Etype (Id) = Any_Type then
6331                return;
6332             end if;
6333
6334             Def_Id := Entity (Id);
6335
6336             if Ekind (Def_Id) = E_Function
6337               and then (Is_CPP_Class (Etype (Def_Id))
6338                          or else (Is_Class_Wide_Type (Etype (Def_Id))
6339                                    and then
6340                                   Is_CPP_Class (Root_Type (Etype (Def_Id)))))
6341             then
6342                if Arg_Count >= 2 then
6343                   Set_Imported (Def_Id);
6344                   Set_Is_Public (Def_Id);
6345                   Process_Interface_Name (Def_Id, Arg2, Arg3);
6346                end if;
6347
6348                Set_Has_Completion (Def_Id);
6349                Set_Is_Constructor (Def_Id);
6350
6351                --  Imported C++ constructors are not dispatching primitives
6352                --  because in C++ they don't have a dispatch table slot.
6353                --  However, in Ada the constructor has the profile of a
6354                --  function that returns a tagged type and therefore it has
6355                --  been treated as a primitive operation during semantic
6356                --  analysis. We now remove it from the list of primitive
6357                --  operations of the type.
6358
6359                if Is_Tagged_Type (Etype (Def_Id))
6360                  and then not Is_Class_Wide_Type (Etype (Def_Id))
6361                then
6362                   pragma Assert (Is_Dispatching_Operation (Def_Id));
6363                   Tag_Typ := Etype (Def_Id);
6364
6365                   Elmt := First_Elmt (Primitive_Operations (Tag_Typ));
6366                   while Present (Elmt) and then Node (Elmt) /= Def_Id loop
6367                      Next_Elmt (Elmt);
6368                   end loop;
6369
6370                   Remove_Elmt (Primitive_Operations (Tag_Typ), Elmt);
6371                   Set_Is_Dispatching_Operation (Def_Id, False);
6372                end if;
6373
6374                --  For backward compatibility, if the constructor returns a
6375                --  class wide type, and we internally change the return type to
6376                --  the corresponding root type.
6377
6378                if Is_Class_Wide_Type (Etype (Def_Id)) then
6379                   Set_Etype (Def_Id, Root_Type (Etype (Def_Id)));
6380                end if;
6381             else
6382                Error_Pragma_Arg
6383                  ("pragma% requires function returning a 'C'P'P_Class type",
6384                    Arg1);
6385             end if;
6386          end CPP_Constructor;
6387
6388          -----------------
6389          -- CPP_Virtual --
6390          -----------------
6391
6392          when Pragma_CPP_Virtual => CPP_Virtual : declare
6393          begin
6394             GNAT_Pragma;
6395
6396             if Warn_On_Obsolescent_Feature then
6397                Error_Msg_N
6398                  ("'G'N'A'T pragma cpp'_virtual is now obsolete and has " &
6399                   "no effect?", N);
6400             end if;
6401          end CPP_Virtual;
6402
6403          ----------------
6404          -- CPP_Vtable --
6405          ----------------
6406
6407          when Pragma_CPP_Vtable => CPP_Vtable : declare
6408          begin
6409             GNAT_Pragma;
6410
6411             if Warn_On_Obsolescent_Feature then
6412                Error_Msg_N
6413                  ("'G'N'A'T pragma cpp'_vtable is now obsolete and has " &
6414                   "no effect?", N);
6415             end if;
6416          end CPP_Vtable;
6417
6418          -----------
6419          -- Debug --
6420          -----------
6421
6422          --  pragma Debug ([boolean_EXPRESSION,] PROCEDURE_CALL_STATEMENT);
6423
6424          when Pragma_Debug => Debug : declare
6425                Cond : Node_Id;
6426
6427          begin
6428             GNAT_Pragma;
6429
6430             Cond :=
6431               New_Occurrence_Of
6432                 (Boolean_Literals (Debug_Pragmas_Enabled and Expander_Active),
6433                  Loc);
6434
6435             if Arg_Count = 2 then
6436                Cond :=
6437                  Make_And_Then (Loc,
6438                    Left_Opnd   => Relocate_Node (Cond),
6439                    Right_Opnd  => Expression (Arg1));
6440             end if;
6441
6442             --  Rewrite into a conditional with an appropriate condition. We
6443             --  wrap the procedure call in a block so that overhead from e.g.
6444             --  use of the secondary stack does not generate execution overhead
6445             --  for suppressed conditions.
6446
6447             Rewrite (N, Make_Implicit_If_Statement (N,
6448               Condition => Cond,
6449                  Then_Statements => New_List (
6450                    Make_Block_Statement (Loc,
6451                      Handled_Statement_Sequence =>
6452                        Make_Handled_Sequence_Of_Statements (Loc,
6453                          Statements => New_List (
6454                            Relocate_Node (Debug_Statement (N))))))));
6455             Analyze (N);
6456          end Debug;
6457
6458          ------------------
6459          -- Debug_Policy --
6460          ------------------
6461
6462          --  pragma Debug_Policy (Check | Ignore)
6463
6464          when Pragma_Debug_Policy =>
6465             GNAT_Pragma;
6466             Check_Arg_Count (1);
6467             Check_Arg_Is_One_Of (Arg1, Name_Check, Name_Ignore);
6468             Debug_Pragmas_Enabled := Chars (Expression (Arg1)) = Name_Check;
6469
6470          ---------------------
6471          -- Detect_Blocking --
6472          ---------------------
6473
6474          --  pragma Detect_Blocking;
6475
6476          when Pragma_Detect_Blocking =>
6477             Ada_2005_Pragma;
6478             Check_Arg_Count (0);
6479             Check_Valid_Configuration_Pragma;
6480             Detect_Blocking := True;
6481
6482          -------------------
6483          -- Discard_Names --
6484          -------------------
6485
6486          --  pragma Discard_Names [([On =>] LOCAL_NAME)];
6487
6488          when Pragma_Discard_Names => Discard_Names : declare
6489             E    : Entity_Id;
6490             E_Id : Entity_Id;
6491
6492          begin
6493             Check_Ada_83_Warning;
6494
6495             --  Deal with configuration pragma case
6496
6497             if Arg_Count = 0 and then Is_Configuration_Pragma then
6498                Global_Discard_Names := True;
6499                return;
6500
6501             --  Otherwise, check correct appropriate context
6502
6503             else
6504                Check_Is_In_Decl_Part_Or_Package_Spec;
6505
6506                if Arg_Count = 0 then
6507
6508                   --  If there is no parameter, then from now on this pragma
6509                   --  applies to any enumeration, exception or tagged type
6510                   --  defined in the current declarative part, and recursively
6511                   --  to any nested scope.
6512
6513                   Set_Discard_Names (Current_Scope);
6514                   return;
6515
6516                else
6517                   Check_Arg_Count (1);
6518                   Check_Optional_Identifier (Arg1, Name_On);
6519                   Check_Arg_Is_Local_Name (Arg1);
6520
6521                   E_Id := Expression (Arg1);
6522
6523                   if Etype (E_Id) = Any_Type then
6524                      return;
6525                   else
6526                      E := Entity (E_Id);
6527                   end if;
6528
6529                   if (Is_First_Subtype (E)
6530                       and then
6531                         (Is_Enumeration_Type (E) or else Is_Tagged_Type (E)))
6532                     or else Ekind (E) = E_Exception
6533                   then
6534                      Set_Discard_Names (E);
6535                   else
6536                      Error_Pragma_Arg
6537                        ("inappropriate entity for pragma%", Arg1);
6538                   end if;
6539
6540                end if;
6541             end if;
6542          end Discard_Names;
6543
6544          ---------------
6545          -- Elaborate --
6546          ---------------
6547
6548          --  pragma Elaborate (library_unit_NAME {, library_unit_NAME});
6549
6550          when Pragma_Elaborate => Elaborate : declare
6551             Arg   : Node_Id;
6552             Citem : Node_Id;
6553
6554          begin
6555             --  Pragma must be in context items list of a compilation unit
6556
6557             if not Is_In_Context_Clause then
6558                Pragma_Misplaced;
6559             end if;
6560
6561             --  Must be at least one argument
6562
6563             if Arg_Count = 0 then
6564                Error_Pragma ("pragma% requires at least one argument");
6565             end if;
6566
6567             --  In Ada 83 mode, there can be no items following it in the
6568             --  context list except other pragmas and implicit with clauses
6569             --  (e.g. those added by use of Rtsfind). In Ada 95 mode, this
6570             --  placement rule does not apply.
6571
6572             if Ada_Version = Ada_83 and then Comes_From_Source (N) then
6573                Citem := Next (N);
6574                while Present (Citem) loop
6575                   if Nkind (Citem) = N_Pragma
6576                     or else (Nkind (Citem) = N_With_Clause
6577                               and then Implicit_With (Citem))
6578                   then
6579                      null;
6580                   else
6581                      Error_Pragma
6582                        ("(Ada 83) pragma% must be at end of context clause");
6583                   end if;
6584
6585                   Next (Citem);
6586                end loop;
6587             end if;
6588
6589             --  Finally, the arguments must all be units mentioned in a with
6590             --  clause in the same context clause. Note we already checked (in
6591             --  Par.Prag) that the arguments are all identifiers or selected
6592             --  components.
6593
6594             Arg := Arg1;
6595             Outer : while Present (Arg) loop
6596                Citem := First (List_Containing (N));
6597                Inner : while Citem /= N loop
6598                   if Nkind (Citem) = N_With_Clause
6599                     and then Same_Name (Name (Citem), Expression (Arg))
6600                   then
6601                      Set_Elaborate_Present (Citem, True);
6602                      Set_Unit_Name (Expression (Arg), Name (Citem));
6603
6604                      --  With the pragma present, elaboration calls on
6605                      --  subprograms from the named unit need no further
6606                      --  checks, as long as the pragma appears in the current
6607                      --  compilation unit. If the pragma appears in some unit
6608                      --  in the context, there might still be a need for an
6609                      --  Elaborate_All_Desirable from the current compilation
6610                      --  to the named unit, so we keep the check enabled.
6611
6612                      if In_Extended_Main_Source_Unit (N) then
6613                         Set_Suppress_Elaboration_Warnings
6614                           (Entity (Name (Citem)));
6615                      end if;
6616
6617                      exit Inner;
6618                   end if;
6619
6620                   Next (Citem);
6621                end loop Inner;
6622
6623                if Citem = N then
6624                   Error_Pragma_Arg
6625                     ("argument of pragma% is not with'ed unit", Arg);
6626                end if;
6627
6628                Next (Arg);
6629             end loop Outer;
6630
6631             --  Give a warning if operating in static mode with -gnatwl
6632             --  (elaboration warnings enabled) switch set.
6633
6634             if Elab_Warnings and not Dynamic_Elaboration_Checks then
6635                Error_Msg_N
6636                  ("?use of pragma Elaborate may not be safe", N);
6637                Error_Msg_N
6638                  ("?use pragma Elaborate_All instead if possible", N);
6639             end if;
6640          end Elaborate;
6641
6642          -------------------
6643          -- Elaborate_All --
6644          -------------------
6645
6646          --  pragma Elaborate_All (library_unit_NAME {, library_unit_NAME});
6647
6648          when Pragma_Elaborate_All => Elaborate_All : declare
6649             Arg   : Node_Id;
6650             Citem : Node_Id;
6651
6652          begin
6653             Check_Ada_83_Warning;
6654
6655             --  Pragma must be in context items list of a compilation unit
6656
6657             if not Is_In_Context_Clause then
6658                Pragma_Misplaced;
6659             end if;
6660
6661             --  Must be at least one argument
6662
6663             if Arg_Count = 0 then
6664                Error_Pragma ("pragma% requires at least one argument");
6665             end if;
6666
6667             --  Note: unlike pragma Elaborate, pragma Elaborate_All does not
6668             --  have to appear at the end of the context clause, but may
6669             --  appear mixed in with other items, even in Ada 83 mode.
6670
6671             --  Final check: the arguments must all be units mentioned in
6672             --  a with clause in the same context clause. Note that we
6673             --  already checked (in Par.Prag) that all the arguments are
6674             --  either identifiers or selected components.
6675
6676             Arg := Arg1;
6677             Outr : while Present (Arg) loop
6678                Citem := First (List_Containing (N));
6679                Innr : while Citem /= N loop
6680                   if Nkind (Citem) = N_With_Clause
6681                     and then Same_Name (Name (Citem), Expression (Arg))
6682                   then
6683                      Set_Elaborate_All_Present (Citem, True);
6684                      Set_Unit_Name (Expression (Arg), Name (Citem));
6685
6686                      --  Suppress warnings and elaboration checks on the named
6687                      --  unit if the pragma is in the current compilation, as
6688                      --  for pragma Elaborate.
6689
6690                      if In_Extended_Main_Source_Unit (N) then
6691                         Set_Suppress_Elaboration_Warnings
6692                           (Entity (Name (Citem)));
6693                      end if;
6694                      exit Innr;
6695                   end if;
6696
6697                   Next (Citem);
6698                end loop Innr;
6699
6700                if Citem = N then
6701                   Set_Error_Posted (N);
6702                   Error_Pragma_Arg
6703                     ("argument of pragma% is not with'ed unit", Arg);
6704                end if;
6705
6706                Next (Arg);
6707             end loop Outr;
6708          end Elaborate_All;
6709
6710          --------------------
6711          -- Elaborate_Body --
6712          --------------------
6713
6714          --  pragma Elaborate_Body [( library_unit_NAME )];
6715
6716          when Pragma_Elaborate_Body => Elaborate_Body : declare
6717             Cunit_Node : Node_Id;
6718             Cunit_Ent  : Entity_Id;
6719
6720          begin
6721             Check_Ada_83_Warning;
6722             Check_Valid_Library_Unit_Pragma;
6723
6724             if Nkind (N) = N_Null_Statement then
6725                return;
6726             end if;
6727
6728             Cunit_Node := Cunit (Current_Sem_Unit);
6729             Cunit_Ent  := Cunit_Entity (Current_Sem_Unit);
6730
6731             if Nkind_In (Unit (Cunit_Node), N_Package_Body,
6732                                             N_Subprogram_Body)
6733             then
6734                Error_Pragma ("pragma% must refer to a spec, not a body");
6735             else
6736                Set_Body_Required (Cunit_Node, True);
6737                Set_Has_Pragma_Elaborate_Body (Cunit_Ent);
6738
6739                --  If we are in dynamic elaboration mode, then we suppress
6740                --  elaboration warnings for the unit, since it is definitely
6741                --  fine NOT to do dynamic checks at the first level (and such
6742                --  checks will be suppressed because no elaboration boolean
6743                --  is created for Elaborate_Body packages).
6744
6745                --  But in the static model of elaboration, Elaborate_Body is
6746                --  definitely NOT good enough to ensure elaboration safety on
6747                --  its own, since the body may WITH other units that are not
6748                --  safe from an elaboration point of view, so a client must
6749                --  still do an Elaborate_All on such units.
6750
6751                --  Debug flag -gnatdD restores the old behavior of 3.13, where
6752                --  Elaborate_Body always suppressed elab warnings.
6753
6754                if Dynamic_Elaboration_Checks or Debug_Flag_DD then
6755                   Set_Suppress_Elaboration_Warnings (Cunit_Ent);
6756                end if;
6757             end if;
6758          end Elaborate_Body;
6759
6760          ------------------------
6761          -- Elaboration_Checks --
6762          ------------------------
6763
6764          --  pragma Elaboration_Checks (Static | Dynamic);
6765
6766          when Pragma_Elaboration_Checks =>
6767             GNAT_Pragma;
6768             Check_Arg_Count (1);
6769             Check_Arg_Is_One_Of (Arg1, Name_Static, Name_Dynamic);
6770             Dynamic_Elaboration_Checks :=
6771               (Chars (Get_Pragma_Arg (Arg1)) = Name_Dynamic);
6772
6773          ---------------
6774          -- Eliminate --
6775          ---------------
6776
6777          --  pragma Eliminate (
6778          --      [Unit_Name  =>] IDENTIFIER | SELECTED_COMPONENT,
6779          --    [,[Entity     =>] IDENTIFIER |
6780          --                      SELECTED_COMPONENT |
6781          --                      STRING_LITERAL]
6782          --    [,                OVERLOADING_RESOLUTION]);
6783
6784          --  OVERLOADING_RESOLUTION ::= PARAMETER_AND_RESULT_TYPE_PROFILE |
6785          --                             SOURCE_LOCATION
6786
6787          --  PARAMETER_AND_RESULT_TYPE_PROFILE ::= PROCEDURE_PROFILE |
6788          --                                        FUNCTION_PROFILE
6789
6790          --  PROCEDURE_PROFILE ::= Parameter_Types => PARAMETER_TYPES
6791
6792          --  FUNCTION_PROFILE ::= [Parameter_Types => PARAMETER_TYPES,]
6793          --                       Result_Type => result_SUBTYPE_NAME]
6794
6795          --  PARAMETER_TYPES ::= (SUBTYPE_NAME {, SUBTYPE_NAME})
6796          --  SUBTYPE_NAME    ::= STRING_LITERAL
6797
6798          --  SOURCE_LOCATION ::= Source_Location => SOURCE_TRACE
6799          --  SOURCE_TRACE    ::= STRING_LITERAL
6800
6801          when Pragma_Eliminate => Eliminate : declare
6802             Args  : Args_List (1 .. 5);
6803             Names : constant Name_List (1 .. 5) := (
6804                       Name_Unit_Name,
6805                       Name_Entity,
6806                       Name_Parameter_Types,
6807                       Name_Result_Type,
6808                       Name_Source_Location);
6809
6810             Unit_Name       : Node_Id renames Args (1);
6811             Entity          : Node_Id renames Args (2);
6812             Parameter_Types : Node_Id renames Args (3);
6813             Result_Type     : Node_Id renames Args (4);
6814             Source_Location : Node_Id renames Args (5);
6815
6816          begin
6817             GNAT_Pragma;
6818             Check_Valid_Configuration_Pragma;
6819             Gather_Associations (Names, Args);
6820
6821             if No (Unit_Name) then
6822                Error_Pragma ("missing Unit_Name argument for pragma%");
6823             end if;
6824
6825             if No (Entity)
6826               and then (Present (Parameter_Types)
6827                           or else
6828                         Present (Result_Type)
6829                           or else
6830                         Present (Source_Location))
6831             then
6832                Error_Pragma ("missing Entity argument for pragma%");
6833             end if;
6834
6835             if (Present (Parameter_Types)
6836                        or else
6837                 Present (Result_Type))
6838               and then
6839                 Present (Source_Location)
6840             then
6841                Error_Pragma
6842                  ("parameter profile and source location cannot " &
6843                   "be used together in pragma%");
6844             end if;
6845
6846             Process_Eliminate_Pragma
6847               (N,
6848                Unit_Name,
6849                Entity,
6850                Parameter_Types,
6851                Result_Type,
6852                Source_Location);
6853          end Eliminate;
6854
6855          ------------
6856          -- Export --
6857          ------------
6858
6859          --  pragma Export (
6860          --    [   Convention    =>] convention_IDENTIFIER,
6861          --    [   Entity        =>] local_NAME
6862          --    [, [External_Name =>] static_string_EXPRESSION ]
6863          --    [, [Link_Name     =>] static_string_EXPRESSION ]);
6864
6865          when Pragma_Export => Export : declare
6866             C      : Convention_Id;
6867             Def_Id : Entity_Id;
6868
6869             pragma Warnings (Off, C);
6870
6871          begin
6872             Check_Ada_83_Warning;
6873             Check_Arg_Order
6874               ((Name_Convention,
6875                 Name_Entity,
6876                 Name_External_Name,
6877                 Name_Link_Name));
6878             Check_At_Least_N_Arguments (2);
6879             Check_At_Most_N_Arguments  (4);
6880             Process_Convention (C, Def_Id);
6881
6882             if Ekind (Def_Id) /= E_Constant then
6883                Note_Possible_Modification (Expression (Arg2), Sure => False);
6884             end if;
6885
6886             Process_Interface_Name (Def_Id, Arg3, Arg4);
6887             Set_Exported (Def_Id, Arg2);
6888
6889             --  If the entity is a deferred constant, propagate the information
6890             --  to the full view, because gigi elaborates the full view only.
6891
6892             if Ekind (Def_Id) = E_Constant
6893               and then Present (Full_View (Def_Id))
6894             then
6895                declare
6896                   Id2 : constant Entity_Id := Full_View (Def_Id);
6897                begin
6898                   Set_Is_Exported    (Id2, Is_Exported          (Def_Id));
6899                   Set_First_Rep_Item (Id2, First_Rep_Item       (Def_Id));
6900                   Set_Interface_Name (Id2, Einfo.Interface_Name (Def_Id));
6901                end;
6902             end if;
6903          end Export;
6904
6905          ----------------------
6906          -- Export_Exception --
6907          ----------------------
6908
6909          --  pragma Export_Exception (
6910          --        [Internal         =>] LOCAL_NAME
6911          --     [, [External         =>] EXTERNAL_SYMBOL]
6912          --     [, [Form     =>] Ada | VMS]
6913          --     [, [Code     =>] static_integer_EXPRESSION]);
6914
6915          when Pragma_Export_Exception => Export_Exception : declare
6916             Args  : Args_List (1 .. 4);
6917             Names : constant Name_List (1 .. 4) := (
6918                       Name_Internal,
6919                       Name_External,
6920                       Name_Form,
6921                       Name_Code);
6922
6923             Internal : Node_Id renames Args (1);
6924             External : Node_Id renames Args (2);
6925             Form     : Node_Id renames Args (3);
6926             Code     : Node_Id renames Args (4);
6927
6928          begin
6929             GNAT_Pragma;
6930
6931             if Inside_A_Generic then
6932                Error_Pragma ("pragma% cannot be used for generic entities");
6933             end if;
6934
6935             Gather_Associations (Names, Args);
6936             Process_Extended_Import_Export_Exception_Pragma (
6937               Arg_Internal => Internal,
6938               Arg_External => External,
6939               Arg_Form     => Form,
6940               Arg_Code     => Code);
6941
6942             if not Is_VMS_Exception (Entity (Internal)) then
6943                Set_Exported (Entity (Internal), Internal);
6944             end if;
6945          end Export_Exception;
6946
6947          ---------------------
6948          -- Export_Function --
6949          ---------------------
6950
6951          --  pragma Export_Function (
6952          --        [Internal         =>] LOCAL_NAME
6953          --     [, [External         =>] EXTERNAL_SYMBOL]
6954          --     [, [Parameter_Types  =>] (PARAMETER_TYPES)]
6955          --     [, [Result_Type      =>] TYPE_DESIGNATOR]
6956          --     [, [Mechanism        =>] MECHANISM]
6957          --     [, [Result_Mechanism =>] MECHANISM_NAME]);
6958
6959          --  EXTERNAL_SYMBOL ::=
6960          --    IDENTIFIER
6961          --  | static_string_EXPRESSION
6962
6963          --  PARAMETER_TYPES ::=
6964          --    null
6965          --  | TYPE_DESIGNATOR @{, TYPE_DESIGNATOR@}
6966
6967          --  TYPE_DESIGNATOR ::=
6968          --    subtype_NAME
6969          --  | subtype_Name ' Access
6970
6971          --  MECHANISM ::=
6972          --    MECHANISM_NAME
6973          --  | (MECHANISM_ASSOCIATION @{, MECHANISM_ASSOCIATION@})
6974
6975          --  MECHANISM_ASSOCIATION ::=
6976          --    [formal_parameter_NAME =>] MECHANISM_NAME
6977
6978          --  MECHANISM_NAME ::=
6979          --    Value
6980          --  | Reference
6981          --  | Descriptor [([Class =>] CLASS_NAME)]
6982
6983          --  CLASS_NAME ::= ubs | ubsb | uba | s | sb | a | nca
6984
6985          when Pragma_Export_Function => Export_Function : declare
6986             Args  : Args_List (1 .. 6);
6987             Names : constant Name_List (1 .. 6) := (
6988                       Name_Internal,
6989                       Name_External,
6990                       Name_Parameter_Types,
6991                       Name_Result_Type,
6992                       Name_Mechanism,
6993                       Name_Result_Mechanism);
6994
6995             Internal         : Node_Id renames Args (1);
6996             External         : Node_Id renames Args (2);
6997             Parameter_Types  : Node_Id renames Args (3);
6998             Result_Type      : Node_Id renames Args (4);
6999             Mechanism        : Node_Id renames Args (5);
7000             Result_Mechanism : Node_Id renames Args (6);
7001
7002          begin
7003             GNAT_Pragma;
7004             Gather_Associations (Names, Args);
7005             Process_Extended_Import_Export_Subprogram_Pragma (
7006               Arg_Internal         => Internal,
7007               Arg_External         => External,
7008               Arg_Parameter_Types  => Parameter_Types,
7009               Arg_Result_Type      => Result_Type,
7010               Arg_Mechanism        => Mechanism,
7011               Arg_Result_Mechanism => Result_Mechanism);
7012          end Export_Function;
7013
7014          -------------------
7015          -- Export_Object --
7016          -------------------
7017
7018          --  pragma Export_Object (
7019          --        [Internal =>] LOCAL_NAME
7020          --     [, [External =>] EXTERNAL_SYMBOL]
7021          --     [, [Size     =>] EXTERNAL_SYMBOL]);
7022
7023          --  EXTERNAL_SYMBOL ::=
7024          --    IDENTIFIER
7025          --  | static_string_EXPRESSION
7026
7027          --  PARAMETER_TYPES ::=
7028          --    null
7029          --  | TYPE_DESIGNATOR @{, TYPE_DESIGNATOR@}
7030
7031          --  TYPE_DESIGNATOR ::=
7032          --    subtype_NAME
7033          --  | subtype_Name ' Access
7034
7035          --  MECHANISM ::=
7036          --    MECHANISM_NAME
7037          --  | (MECHANISM_ASSOCIATION @{, MECHANISM_ASSOCIATION@})
7038
7039          --  MECHANISM_ASSOCIATION ::=
7040          --    [formal_parameter_NAME =>] MECHANISM_NAME
7041
7042          --  MECHANISM_NAME ::=
7043          --    Value
7044          --  | Reference
7045          --  | Descriptor [([Class =>] CLASS_NAME)]
7046
7047          --  CLASS_NAME ::= ubs | ubsb | uba | s | sb | a | nca
7048
7049          when Pragma_Export_Object => Export_Object : declare
7050             Args  : Args_List (1 .. 3);
7051             Names : constant Name_List (1 .. 3) := (
7052                       Name_Internal,
7053                       Name_External,
7054                       Name_Size);
7055
7056             Internal : Node_Id renames Args (1);
7057             External : Node_Id renames Args (2);
7058             Size     : Node_Id renames Args (3);
7059
7060          begin
7061             GNAT_Pragma;
7062             Gather_Associations (Names, Args);
7063             Process_Extended_Import_Export_Object_Pragma (
7064               Arg_Internal => Internal,
7065               Arg_External => External,
7066               Arg_Size     => Size);
7067          end Export_Object;
7068
7069          ----------------------
7070          -- Export_Procedure --
7071          ----------------------
7072
7073          --  pragma Export_Procedure (
7074          --        [Internal         =>] LOCAL_NAME
7075          --     [, [External         =>] EXTERNAL_SYMBOL]
7076          --     [, [Parameter_Types  =>] (PARAMETER_TYPES)]
7077          --     [, [Mechanism        =>] MECHANISM]);
7078
7079          --  EXTERNAL_SYMBOL ::=
7080          --    IDENTIFIER
7081          --  | static_string_EXPRESSION
7082
7083          --  PARAMETER_TYPES ::=
7084          --    null
7085          --  | TYPE_DESIGNATOR @{, TYPE_DESIGNATOR@}
7086
7087          --  TYPE_DESIGNATOR ::=
7088          --    subtype_NAME
7089          --  | subtype_Name ' Access
7090
7091          --  MECHANISM ::=
7092          --    MECHANISM_NAME
7093          --  | (MECHANISM_ASSOCIATION @{, MECHANISM_ASSOCIATION@})
7094
7095          --  MECHANISM_ASSOCIATION ::=
7096          --    [formal_parameter_NAME =>] MECHANISM_NAME
7097
7098          --  MECHANISM_NAME ::=
7099          --    Value
7100          --  | Reference
7101          --  | Descriptor [([Class =>] CLASS_NAME)]
7102
7103          --  CLASS_NAME ::= ubs | ubsb | uba | s | sb | a | nca
7104
7105          when Pragma_Export_Procedure => Export_Procedure : declare
7106             Args  : Args_List (1 .. 4);
7107             Names : constant Name_List (1 .. 4) := (
7108                       Name_Internal,
7109                       Name_External,
7110                       Name_Parameter_Types,
7111                       Name_Mechanism);
7112
7113             Internal        : Node_Id renames Args (1);
7114             External        : Node_Id renames Args (2);
7115             Parameter_Types : Node_Id renames Args (3);
7116             Mechanism       : Node_Id renames Args (4);
7117
7118          begin
7119             GNAT_Pragma;
7120             Gather_Associations (Names, Args);
7121             Process_Extended_Import_Export_Subprogram_Pragma (
7122               Arg_Internal        => Internal,
7123               Arg_External        => External,
7124               Arg_Parameter_Types => Parameter_Types,
7125               Arg_Mechanism       => Mechanism);
7126          end Export_Procedure;
7127
7128          ------------------
7129          -- Export_Value --
7130          ------------------
7131
7132          --  pragma Export_Value (
7133          --     [Value     =>] static_integer_EXPRESSION,
7134          --     [Link_Name =>] static_string_EXPRESSION);
7135
7136          when Pragma_Export_Value =>
7137             GNAT_Pragma;
7138             Check_Arg_Order ((Name_Value, Name_Link_Name));
7139             Check_Arg_Count (2);
7140
7141             Check_Optional_Identifier (Arg1, Name_Value);
7142             Check_Arg_Is_Static_Expression (Arg1, Any_Integer);
7143
7144             Check_Optional_Identifier (Arg2, Name_Link_Name);
7145             Check_Arg_Is_Static_Expression (Arg2, Standard_String);
7146
7147          -----------------------------
7148          -- Export_Valued_Procedure --
7149          -----------------------------
7150
7151          --  pragma Export_Valued_Procedure (
7152          --        [Internal         =>] LOCAL_NAME
7153          --     [, [External         =>] EXTERNAL_SYMBOL,]
7154          --     [, [Parameter_Types  =>] (PARAMETER_TYPES)]
7155          --     [, [Mechanism        =>] MECHANISM]);
7156
7157          --  EXTERNAL_SYMBOL ::=
7158          --    IDENTIFIER
7159          --  | static_string_EXPRESSION
7160
7161          --  PARAMETER_TYPES ::=
7162          --    null
7163          --  | TYPE_DESIGNATOR @{, TYPE_DESIGNATOR@}
7164
7165          --  TYPE_DESIGNATOR ::=
7166          --    subtype_NAME
7167          --  | subtype_Name ' Access
7168
7169          --  MECHANISM ::=
7170          --    MECHANISM_NAME
7171          --  | (MECHANISM_ASSOCIATION @{, MECHANISM_ASSOCIATION@})
7172
7173          --  MECHANISM_ASSOCIATION ::=
7174          --    [formal_parameter_NAME =>] MECHANISM_NAME
7175
7176          --  MECHANISM_NAME ::=
7177          --    Value
7178          --  | Reference
7179          --  | Descriptor [([Class =>] CLASS_NAME)]
7180
7181          --  CLASS_NAME ::= ubs | ubsb | uba | s | sb | a | nca
7182
7183          when Pragma_Export_Valued_Procedure =>
7184          Export_Valued_Procedure : declare
7185             Args  : Args_List (1 .. 4);
7186             Names : constant Name_List (1 .. 4) := (
7187                       Name_Internal,
7188                       Name_External,
7189                       Name_Parameter_Types,
7190                       Name_Mechanism);
7191
7192             Internal        : Node_Id renames Args (1);
7193             External        : Node_Id renames Args (2);
7194             Parameter_Types : Node_Id renames Args (3);
7195             Mechanism       : Node_Id renames Args (4);
7196
7197          begin
7198             GNAT_Pragma;
7199             Gather_Associations (Names, Args);
7200             Process_Extended_Import_Export_Subprogram_Pragma (
7201               Arg_Internal        => Internal,
7202               Arg_External        => External,
7203               Arg_Parameter_Types => Parameter_Types,
7204               Arg_Mechanism       => Mechanism);
7205          end Export_Valued_Procedure;
7206
7207          -------------------
7208          -- Extend_System --
7209          -------------------
7210
7211          --  pragma Extend_System ([Name =>] Identifier);
7212
7213          when Pragma_Extend_System => Extend_System : declare
7214          begin
7215             GNAT_Pragma;
7216             Check_Valid_Configuration_Pragma;
7217             Check_Arg_Count (1);
7218             Check_Optional_Identifier (Arg1, Name_Name);
7219             Check_Arg_Is_Identifier (Arg1);
7220
7221             Get_Name_String (Chars (Expression (Arg1)));
7222
7223             if Name_Len > 4
7224               and then Name_Buffer (1 .. 4) = "aux_"
7225             then
7226                if Present (System_Extend_Pragma_Arg) then
7227                   if Chars (Expression (Arg1)) =
7228                      Chars (Expression (System_Extend_Pragma_Arg))
7229                   then
7230                      null;
7231                   else
7232                      Error_Msg_Sloc := Sloc (System_Extend_Pragma_Arg);
7233                      Error_Pragma ("pragma% conflicts with that #");
7234                   end if;
7235
7236                else
7237                   System_Extend_Pragma_Arg := Arg1;
7238
7239                   if not GNAT_Mode then
7240                      System_Extend_Unit := Arg1;
7241                   end if;
7242                end if;
7243             else
7244                Error_Pragma ("incorrect name for pragma%, must be Aux_xxx");
7245             end if;
7246          end Extend_System;
7247
7248          ------------------------
7249          -- Extensions_Allowed --
7250          ------------------------
7251
7252          --  pragma Extensions_Allowed (ON | OFF);
7253
7254          when Pragma_Extensions_Allowed =>
7255             GNAT_Pragma;
7256             Check_Arg_Count (1);
7257             Check_No_Identifiers;
7258             Check_Arg_Is_One_Of (Arg1, Name_On, Name_Off);
7259
7260             if Chars (Expression (Arg1)) = Name_On then
7261                Extensions_Allowed := True;
7262             else
7263                Extensions_Allowed := False;
7264             end if;
7265
7266          --------------
7267          -- External --
7268          --------------
7269
7270          --  pragma External (
7271          --    [   Convention    =>] convention_IDENTIFIER,
7272          --    [   Entity        =>] local_NAME
7273          --    [, [External_Name =>] static_string_EXPRESSION ]
7274          --    [, [Link_Name     =>] static_string_EXPRESSION ]);
7275
7276          when Pragma_External => External : declare
7277                Def_Id : Entity_Id;
7278
7279                C : Convention_Id;
7280                pragma Warnings (Off, C);
7281
7282          begin
7283             GNAT_Pragma;
7284             Check_Arg_Order
7285               ((Name_Convention,
7286                 Name_Entity,
7287                 Name_External_Name,
7288                 Name_Link_Name));
7289             Check_At_Least_N_Arguments (2);
7290             Check_At_Most_N_Arguments  (4);
7291             Process_Convention (C, Def_Id);
7292             Note_Possible_Modification (Expression (Arg2), Sure => False);
7293             Process_Interface_Name (Def_Id, Arg3, Arg4);
7294             Set_Exported (Def_Id, Arg2);
7295          end External;
7296
7297          --------------------------
7298          -- External_Name_Casing --
7299          --------------------------
7300
7301          --  pragma External_Name_Casing (
7302          --    UPPERCASE | LOWERCASE
7303          --    [, AS_IS | UPPERCASE | LOWERCASE]);
7304
7305          when Pragma_External_Name_Casing => External_Name_Casing : declare
7306          begin
7307             GNAT_Pragma;
7308             Check_No_Identifiers;
7309
7310             if Arg_Count = 2 then
7311                Check_Arg_Is_One_Of
7312                  (Arg2, Name_As_Is, Name_Uppercase, Name_Lowercase);
7313
7314                case Chars (Get_Pragma_Arg (Arg2)) is
7315                   when Name_As_Is     =>
7316                      Opt.External_Name_Exp_Casing := As_Is;
7317
7318                   when Name_Uppercase =>
7319                      Opt.External_Name_Exp_Casing := Uppercase;
7320
7321                   when Name_Lowercase =>
7322                      Opt.External_Name_Exp_Casing := Lowercase;
7323
7324                   when others =>
7325                      null;
7326                end case;
7327
7328             else
7329                Check_Arg_Count (1);
7330             end if;
7331
7332             Check_Arg_Is_One_Of (Arg1, Name_Uppercase, Name_Lowercase);
7333
7334             case Chars (Get_Pragma_Arg (Arg1)) is
7335                when Name_Uppercase =>
7336                   Opt.External_Name_Imp_Casing := Uppercase;
7337
7338                when Name_Lowercase =>
7339                   Opt.External_Name_Imp_Casing := Lowercase;
7340
7341                when others =>
7342                   null;
7343             end case;
7344          end External_Name_Casing;
7345
7346          --------------------------
7347          -- Favor_Top_Level --
7348          --------------------------
7349
7350          --  pragma Favor_Top_Level (type_NAME);
7351
7352          when Pragma_Favor_Top_Level => Favor_Top_Level : declare
7353                Named_Entity : Entity_Id;
7354
7355          begin
7356             GNAT_Pragma;
7357             Check_No_Identifiers;
7358             Check_Arg_Count (1);
7359             Check_Arg_Is_Local_Name (Arg1);
7360             Named_Entity := Entity (Expression (Arg1));
7361
7362             --  If it's an access-to-subprogram type (in particular, not a
7363             --  subtype), set the flag on that type.
7364
7365             if Is_Access_Subprogram_Type (Named_Entity) then
7366                Set_Can_Use_Internal_Rep (Named_Entity, False);
7367
7368             --  Otherwise it's an error (name denotes the wrong sort of entity)
7369
7370             else
7371                Error_Pragma_Arg
7372                  ("access-to-subprogram type expected", Expression (Arg1));
7373             end if;
7374          end Favor_Top_Level;
7375
7376          ---------------
7377          -- Fast_Math --
7378          ---------------
7379
7380          --  pragma Fast_Math;
7381
7382          when Pragma_Fast_Math =>
7383             GNAT_Pragma;
7384             Check_No_Identifiers;
7385             Check_Valid_Configuration_Pragma;
7386             Fast_Math := True;
7387
7388          ---------------------------
7389          -- Finalize_Storage_Only --
7390          ---------------------------
7391
7392          --  pragma Finalize_Storage_Only (first_subtype_LOCAL_NAME);
7393
7394          when Pragma_Finalize_Storage_Only => Finalize_Storage : declare
7395             Assoc   : constant Node_Id := Arg1;
7396             Type_Id : constant Node_Id := Expression (Assoc);
7397             Typ     : Entity_Id;
7398
7399          begin
7400             GNAT_Pragma;
7401             Check_No_Identifiers;
7402             Check_Arg_Count (1);
7403             Check_Arg_Is_Local_Name (Arg1);
7404
7405             Find_Type (Type_Id);
7406             Typ := Entity (Type_Id);
7407
7408             if Typ = Any_Type
7409               or else Rep_Item_Too_Early (Typ, N)
7410             then
7411                return;
7412             else
7413                Typ := Underlying_Type (Typ);
7414             end if;
7415
7416             if not Is_Controlled (Typ) then
7417                Error_Pragma ("pragma% must specify controlled type");
7418             end if;
7419
7420             Check_First_Subtype (Arg1);
7421
7422             if Finalize_Storage_Only (Typ) then
7423                Error_Pragma ("duplicate pragma%, only one allowed");
7424
7425             elsif not Rep_Item_Too_Late (Typ, N) then
7426                Set_Finalize_Storage_Only (Base_Type (Typ), True);
7427             end if;
7428          end Finalize_Storage;
7429
7430          --------------------------
7431          -- Float_Representation --
7432          --------------------------
7433
7434          --  pragma Float_Representation (FLOAT_REP[, float_type_LOCAL_NAME]);
7435
7436          --  FLOAT_REP ::= VAX_Float | IEEE_Float
7437
7438          when Pragma_Float_Representation => Float_Representation : declare
7439             Argx : Node_Id;
7440             Digs : Nat;
7441             Ent  : Entity_Id;
7442
7443          begin
7444             GNAT_Pragma;
7445
7446             if Arg_Count = 1 then
7447                Check_Valid_Configuration_Pragma;
7448             else
7449                Check_Arg_Count (2);
7450                Check_Optional_Identifier (Arg2, Name_Entity);
7451                Check_Arg_Is_Local_Name (Arg2);
7452             end if;
7453
7454             Check_No_Identifier (Arg1);
7455             Check_Arg_Is_One_Of (Arg1, Name_VAX_Float, Name_IEEE_Float);
7456
7457             if not OpenVMS_On_Target then
7458                if Chars (Expression (Arg1)) = Name_VAX_Float then
7459                   Error_Pragma
7460                     ("?pragma% ignored (applies only to Open'V'M'S)");
7461                end if;
7462
7463                return;
7464             end if;
7465
7466             --  One argument case
7467
7468             if Arg_Count = 1 then
7469                if Chars (Expression (Arg1)) = Name_VAX_Float then
7470                   if Opt.Float_Format = 'I' then
7471                      Error_Pragma ("'I'E'E'E format previously specified");
7472                   end if;
7473
7474                   Opt.Float_Format := 'V';
7475
7476                else
7477                   if Opt.Float_Format = 'V' then
7478                      Error_Pragma ("'V'A'X format previously specified");
7479                   end if;
7480
7481                   Opt.Float_Format := 'I';
7482                end if;
7483
7484                Set_Standard_Fpt_Formats;
7485
7486             --  Two argument case
7487
7488             else
7489                Argx := Get_Pragma_Arg (Arg2);
7490
7491                if not Is_Entity_Name (Argx)
7492                  or else not Is_Floating_Point_Type (Entity (Argx))
7493                then
7494                   Error_Pragma_Arg
7495                     ("second argument of% pragma must be floating-point type",
7496                      Arg2);
7497                end if;
7498
7499                Ent  := Entity (Argx);
7500                Digs := UI_To_Int (Digits_Value (Ent));
7501
7502                --  Two arguments, VAX_Float case
7503
7504                if Chars (Expression (Arg1)) = Name_VAX_Float then
7505                   case Digs is
7506                      when  6 => Set_F_Float (Ent);
7507                      when  9 => Set_D_Float (Ent);
7508                      when 15 => Set_G_Float (Ent);
7509
7510                      when others =>
7511                         Error_Pragma_Arg
7512                           ("wrong digits value, must be 6,9 or 15", Arg2);
7513                   end case;
7514
7515                --  Two arguments, IEEE_Float case
7516
7517                else
7518                   case Digs is
7519                      when  6 => Set_IEEE_Short (Ent);
7520                      when 15 => Set_IEEE_Long  (Ent);
7521
7522                      when others =>
7523                         Error_Pragma_Arg
7524                           ("wrong digits value, must be 6 or 15", Arg2);
7525                   end case;
7526                end if;
7527             end if;
7528          end Float_Representation;
7529
7530          -----------
7531          -- Ident --
7532          -----------
7533
7534          --  pragma Ident (static_string_EXPRESSION)
7535
7536          --  Note: pragma Comment shares this processing. Pragma Comment is
7537          --  identical to Ident, except that the restriction of the argument to
7538          --  31 characters and the placement restrictions are not enforced for
7539          --  pragma Comment.
7540
7541          when Pragma_Ident | Pragma_Comment => Ident : declare
7542             Str : Node_Id;
7543
7544          begin
7545             GNAT_Pragma;
7546             Check_Arg_Count (1);
7547             Check_No_Identifiers;
7548             Check_Arg_Is_Static_Expression (Arg1, Standard_String);
7549
7550             --  For pragma Ident, preserve DEC compatibility by requiring the
7551             --  pragma to appear in a declarative part or package spec.
7552
7553             if Prag_Id = Pragma_Ident then
7554                Check_Is_In_Decl_Part_Or_Package_Spec;
7555             end if;
7556
7557             Str := Expr_Value_S (Expression (Arg1));
7558
7559             declare
7560                CS : Node_Id;
7561                GP : Node_Id;
7562
7563             begin
7564                GP := Parent (Parent (N));
7565
7566                if Nkind_In (GP, N_Package_Declaration,
7567                                 N_Generic_Package_Declaration)
7568                then
7569                   GP := Parent (GP);
7570                end if;
7571
7572                --  If we have a compilation unit, then record the ident value,
7573                --  checking for improper duplication.
7574
7575                if Nkind (GP) = N_Compilation_Unit then
7576                   CS := Ident_String (Current_Sem_Unit);
7577
7578                   if Present (CS) then
7579
7580                      --  For Ident, we do not permit multiple instances
7581
7582                      if Prag_Id = Pragma_Ident then
7583                         Error_Pragma ("duplicate% pragma not permitted");
7584
7585                      --  For Comment, we concatenate the string, unless we want
7586                      --  to preserve the tree structure for ASIS.
7587
7588                      elsif not ASIS_Mode then
7589                         Start_String (Strval (CS));
7590                         Store_String_Char (' ');
7591                         Store_String_Chars (Strval (Str));
7592                         Set_Strval (CS, End_String);
7593                      end if;
7594
7595                   else
7596                      --  In VMS, the effect of IDENT is achieved by passing
7597                      --  IDENTIFICATION=name as a --for-linker switch.
7598
7599                      if OpenVMS_On_Target then
7600                         Start_String;
7601                         Store_String_Chars
7602                           ("--for-linker=IDENTIFICATION=");
7603                         String_To_Name_Buffer (Strval (Str));
7604                         Store_String_Chars (Name_Buffer (1 .. Name_Len));
7605
7606                         --  Only the last processed IDENT is saved. The main
7607                         --  purpose is so an IDENT associated with a main
7608                         --  procedure will be used in preference to an IDENT
7609                         --  associated with a with'd package.
7610
7611                         Replace_Linker_Option_String
7612                           (End_String, "--for-linker=IDENTIFICATION=");
7613                      end if;
7614
7615                      Set_Ident_String (Current_Sem_Unit, Str);
7616                   end if;
7617
7618                --  For subunits, we just ignore the Ident, since in GNAT these
7619                --  are not separate object files, and hence not separate units
7620                --  in the unit table.
7621
7622                elsif Nkind (GP) = N_Subunit then
7623                   null;
7624
7625                --  Otherwise we have a misplaced pragma Ident, but we ignore
7626                --  this if we are in an instantiation, since it comes from
7627                --  a generic, and has no relevance to the instantiation.
7628
7629                elsif Prag_Id = Pragma_Ident then
7630                   if Instantiation_Location (Loc) = No_Location then
7631                      Error_Pragma ("pragma% only allowed at outer level");
7632                   end if;
7633                end if;
7634             end;
7635          end Ident;
7636
7637          --------------------------
7638          -- Implemented_By_Entry --
7639          --------------------------
7640
7641          --  pragma Implemented_By_Entry (DIRECT_NAME);
7642
7643          when Pragma_Implemented_By_Entry => Implemented_By_Entry : declare
7644             Ent : Entity_Id;
7645
7646          begin
7647             Ada_2005_Pragma;
7648             Check_Arg_Count (1);
7649             Check_No_Identifiers;
7650             Check_Arg_Is_Identifier (Arg1);
7651             Check_Arg_Is_Local_Name (Arg1);
7652             Ent := Entity (Expression (Arg1));
7653
7654             --  Pragma Implemented_By_Entry must be applied only to protected
7655             --  synchronized or task interface primitives.
7656
7657             if (Ekind (Ent) /= E_Function
7658                   and then Ekind (Ent) /= E_Procedure)
7659                or else not Present (First_Formal (Ent))
7660                or else not Is_Concurrent_Interface (Etype (First_Formal (Ent)))
7661             then
7662                Error_Pragma_Arg
7663                  ("pragma % must be applied to a concurrent interface " &
7664                   "primitive", Arg1);
7665
7666             else
7667                if Einfo.Implemented_By_Entry (Ent)
7668                  and then Warn_On_Redundant_Constructs
7669                then
7670                   Error_Pragma ("?duplicate pragma%!");
7671                else
7672                   Set_Implemented_By_Entry (Ent);
7673                end if;
7674             end if;
7675          end Implemented_By_Entry;
7676
7677          -----------------------
7678          -- Implicit_Packing --
7679          -----------------------
7680
7681          --  pragma Implicit_Packing;
7682
7683          when Pragma_Implicit_Packing =>
7684             GNAT_Pragma;
7685             Check_Arg_Count (0);
7686             Implicit_Packing := True;
7687
7688          ------------
7689          -- Import --
7690          ------------
7691
7692          --  pragma Import (
7693          --       [Convention    =>] convention_IDENTIFIER,
7694          --       [Entity        =>] local_NAME
7695          --    [, [External_Name =>] static_string_EXPRESSION ]
7696          --    [, [Link_Name     =>] static_string_EXPRESSION ]);
7697
7698          when Pragma_Import =>
7699             Check_Ada_83_Warning;
7700             Check_Arg_Order
7701               ((Name_Convention,
7702                 Name_Entity,
7703                 Name_External_Name,
7704                 Name_Link_Name));
7705             Check_At_Least_N_Arguments (2);
7706             Check_At_Most_N_Arguments  (4);
7707             Process_Import_Or_Interface;
7708
7709          ----------------------
7710          -- Import_Exception --
7711          ----------------------
7712
7713          --  pragma Import_Exception (
7714          --        [Internal         =>] LOCAL_NAME
7715          --     [, [External         =>] EXTERNAL_SYMBOL]
7716          --     [, [Form     =>] Ada | VMS]
7717          --     [, [Code     =>] static_integer_EXPRESSION]);
7718
7719          when Pragma_Import_Exception => Import_Exception : declare
7720             Args  : Args_List (1 .. 4);
7721             Names : constant Name_List (1 .. 4) := (
7722                       Name_Internal,
7723                       Name_External,
7724                       Name_Form,
7725                       Name_Code);
7726
7727             Internal : Node_Id renames Args (1);
7728             External : Node_Id renames Args (2);
7729             Form     : Node_Id renames Args (3);
7730             Code     : Node_Id renames Args (4);
7731
7732          begin
7733             GNAT_Pragma;
7734             Gather_Associations (Names, Args);
7735
7736             if Present (External) and then Present (Code) then
7737                Error_Pragma
7738                  ("cannot give both External and Code options for pragma%");
7739             end if;
7740
7741             Process_Extended_Import_Export_Exception_Pragma (
7742               Arg_Internal => Internal,
7743               Arg_External => External,
7744               Arg_Form     => Form,
7745               Arg_Code     => Code);
7746
7747             if not Is_VMS_Exception (Entity (Internal)) then
7748                Set_Imported (Entity (Internal));
7749             end if;
7750          end Import_Exception;
7751
7752          ---------------------
7753          -- Import_Function --
7754          ---------------------
7755
7756          --  pragma Import_Function (
7757          --        [Internal                 =>] LOCAL_NAME,
7758          --     [, [External                 =>] EXTERNAL_SYMBOL]
7759          --     [, [Parameter_Types          =>] (PARAMETER_TYPES)]
7760          --     [, [Result_Type              =>] SUBTYPE_MARK]
7761          --     [, [Mechanism                =>] MECHANISM]
7762          --     [, [Result_Mechanism         =>] MECHANISM_NAME]
7763          --     [, [First_Optional_Parameter =>] IDENTIFIER]);
7764
7765          --  EXTERNAL_SYMBOL ::=
7766          --    IDENTIFIER
7767          --  | static_string_EXPRESSION
7768
7769          --  PARAMETER_TYPES ::=
7770          --    null
7771          --  | TYPE_DESIGNATOR @{, TYPE_DESIGNATOR@}
7772
7773          --  TYPE_DESIGNATOR ::=
7774          --    subtype_NAME
7775          --  | subtype_Name ' Access
7776
7777          --  MECHANISM ::=
7778          --    MECHANISM_NAME
7779          --  | (MECHANISM_ASSOCIATION @{, MECHANISM_ASSOCIATION@})
7780
7781          --  MECHANISM_ASSOCIATION ::=
7782          --    [formal_parameter_NAME =>] MECHANISM_NAME
7783
7784          --  MECHANISM_NAME ::=
7785          --    Value
7786          --  | Reference
7787          --  | Descriptor [([Class =>] CLASS_NAME)]
7788
7789          --  CLASS_NAME ::= ubs | ubsb | uba | s | sb | a | nca
7790
7791          when Pragma_Import_Function => Import_Function : declare
7792             Args  : Args_List (1 .. 7);
7793             Names : constant Name_List (1 .. 7) := (
7794                       Name_Internal,
7795                       Name_External,
7796                       Name_Parameter_Types,
7797                       Name_Result_Type,
7798                       Name_Mechanism,
7799                       Name_Result_Mechanism,
7800                       Name_First_Optional_Parameter);
7801
7802             Internal                 : Node_Id renames Args (1);
7803             External                 : Node_Id renames Args (2);
7804             Parameter_Types          : Node_Id renames Args (3);
7805             Result_Type              : Node_Id renames Args (4);
7806             Mechanism                : Node_Id renames Args (5);
7807             Result_Mechanism         : Node_Id renames Args (6);
7808             First_Optional_Parameter : Node_Id renames Args (7);
7809
7810          begin
7811             GNAT_Pragma;
7812             Gather_Associations (Names, Args);
7813             Process_Extended_Import_Export_Subprogram_Pragma (
7814               Arg_Internal                 => Internal,
7815               Arg_External                 => External,
7816               Arg_Parameter_Types          => Parameter_Types,
7817               Arg_Result_Type              => Result_Type,
7818               Arg_Mechanism                => Mechanism,
7819               Arg_Result_Mechanism         => Result_Mechanism,
7820               Arg_First_Optional_Parameter => First_Optional_Parameter);
7821          end Import_Function;
7822
7823          -------------------
7824          -- Import_Object --
7825          -------------------
7826
7827          --  pragma Import_Object (
7828          --        [Internal =>] LOCAL_NAME
7829          --     [, [External =>] EXTERNAL_SYMBOL]
7830          --     [, [Size     =>] EXTERNAL_SYMBOL]);
7831
7832          --  EXTERNAL_SYMBOL ::=
7833          --    IDENTIFIER
7834          --  | static_string_EXPRESSION
7835
7836          when Pragma_Import_Object => Import_Object : declare
7837             Args  : Args_List (1 .. 3);
7838             Names : constant Name_List (1 .. 3) := (
7839                       Name_Internal,
7840                       Name_External,
7841                       Name_Size);
7842
7843             Internal : Node_Id renames Args (1);
7844             External : Node_Id renames Args (2);
7845             Size     : Node_Id renames Args (3);
7846
7847          begin
7848             GNAT_Pragma;
7849             Gather_Associations (Names, Args);
7850             Process_Extended_Import_Export_Object_Pragma (
7851               Arg_Internal => Internal,
7852               Arg_External => External,
7853               Arg_Size     => Size);
7854          end Import_Object;
7855
7856          ----------------------
7857          -- Import_Procedure --
7858          ----------------------
7859
7860          --  pragma Import_Procedure (
7861          --        [Internal                 =>] LOCAL_NAME
7862          --     [, [External                 =>] EXTERNAL_SYMBOL]
7863          --     [, [Parameter_Types          =>] (PARAMETER_TYPES)]
7864          --     [, [Mechanism                =>] MECHANISM]
7865          --     [, [First_Optional_Parameter =>] IDENTIFIER]);
7866
7867          --  EXTERNAL_SYMBOL ::=
7868          --    IDENTIFIER
7869          --  | static_string_EXPRESSION
7870
7871          --  PARAMETER_TYPES ::=
7872          --    null
7873          --  | TYPE_DESIGNATOR @{, TYPE_DESIGNATOR@}
7874
7875          --  TYPE_DESIGNATOR ::=
7876          --    subtype_NAME
7877          --  | subtype_Name ' Access
7878
7879          --  MECHANISM ::=
7880          --    MECHANISM_NAME
7881          --  | (MECHANISM_ASSOCIATION @{, MECHANISM_ASSOCIATION@})
7882
7883          --  MECHANISM_ASSOCIATION ::=
7884          --    [formal_parameter_NAME =>] MECHANISM_NAME
7885
7886          --  MECHANISM_NAME ::=
7887          --    Value
7888          --  | Reference
7889          --  | Descriptor [([Class =>] CLASS_NAME)]
7890
7891          --  CLASS_NAME ::= ubs | ubsb | uba | s | sb | a | nca
7892
7893          when Pragma_Import_Procedure => Import_Procedure : declare
7894             Args  : Args_List (1 .. 5);
7895             Names : constant Name_List (1 .. 5) := (
7896                       Name_Internal,
7897                       Name_External,
7898                       Name_Parameter_Types,
7899                       Name_Mechanism,
7900                       Name_First_Optional_Parameter);
7901
7902             Internal                 : Node_Id renames Args (1);
7903             External                 : Node_Id renames Args (2);
7904             Parameter_Types          : Node_Id renames Args (3);
7905             Mechanism                : Node_Id renames Args (4);
7906             First_Optional_Parameter : Node_Id renames Args (5);
7907
7908          begin
7909             GNAT_Pragma;
7910             Gather_Associations (Names, Args);
7911             Process_Extended_Import_Export_Subprogram_Pragma (
7912               Arg_Internal                 => Internal,
7913               Arg_External                 => External,
7914               Arg_Parameter_Types          => Parameter_Types,
7915               Arg_Mechanism                => Mechanism,
7916               Arg_First_Optional_Parameter => First_Optional_Parameter);
7917          end Import_Procedure;
7918
7919          -----------------------------
7920          -- Import_Valued_Procedure --
7921          -----------------------------
7922
7923          --  pragma Import_Valued_Procedure (
7924          --        [Internal                 =>] LOCAL_NAME
7925          --     [, [External                 =>] EXTERNAL_SYMBOL]
7926          --     [, [Parameter_Types          =>] (PARAMETER_TYPES)]
7927          --     [, [Mechanism                =>] MECHANISM]
7928          --     [, [First_Optional_Parameter =>] IDENTIFIER]);
7929
7930          --  EXTERNAL_SYMBOL ::=
7931          --    IDENTIFIER
7932          --  | static_string_EXPRESSION
7933
7934          --  PARAMETER_TYPES ::=
7935          --    null
7936          --  | TYPE_DESIGNATOR @{, TYPE_DESIGNATOR@}
7937
7938          --  TYPE_DESIGNATOR ::=
7939          --    subtype_NAME
7940          --  | subtype_Name ' Access
7941
7942          --  MECHANISM ::=
7943          --    MECHANISM_NAME
7944          --  | (MECHANISM_ASSOCIATION @{, MECHANISM_ASSOCIATION@})
7945
7946          --  MECHANISM_ASSOCIATION ::=
7947          --    [formal_parameter_NAME =>] MECHANISM_NAME
7948
7949          --  MECHANISM_NAME ::=
7950          --    Value
7951          --  | Reference
7952          --  | Descriptor [([Class =>] CLASS_NAME)]
7953
7954          --  CLASS_NAME ::= ubs | ubsb | uba | s | sb | a | nca
7955
7956          when Pragma_Import_Valued_Procedure =>
7957          Import_Valued_Procedure : declare
7958             Args  : Args_List (1 .. 5);
7959             Names : constant Name_List (1 .. 5) := (
7960                       Name_Internal,
7961                       Name_External,
7962                       Name_Parameter_Types,
7963                       Name_Mechanism,
7964                       Name_First_Optional_Parameter);
7965
7966             Internal                 : Node_Id renames Args (1);
7967             External                 : Node_Id renames Args (2);
7968             Parameter_Types          : Node_Id renames Args (3);
7969             Mechanism                : Node_Id renames Args (4);
7970             First_Optional_Parameter : Node_Id renames Args (5);
7971
7972          begin
7973             GNAT_Pragma;
7974             Gather_Associations (Names, Args);
7975             Process_Extended_Import_Export_Subprogram_Pragma (
7976               Arg_Internal                 => Internal,
7977               Arg_External                 => External,
7978               Arg_Parameter_Types          => Parameter_Types,
7979               Arg_Mechanism                => Mechanism,
7980               Arg_First_Optional_Parameter => First_Optional_Parameter);
7981          end Import_Valued_Procedure;
7982
7983          ------------------------
7984          -- Initialize_Scalars --
7985          ------------------------
7986
7987          --  pragma Initialize_Scalars;
7988
7989          when Pragma_Initialize_Scalars =>
7990             GNAT_Pragma;
7991             Check_Arg_Count (0);
7992             Check_Valid_Configuration_Pragma;
7993             Check_Restriction (No_Initialize_Scalars, N);
7994
7995             --  Initialize_Scalars creates false positives in CodePeer,
7996             --  so ignore this pragma in this mode.
7997
7998             if not Restriction_Active (No_Initialize_Scalars)
7999               and then not CodePeer_Mode
8000             then
8001                Init_Or_Norm_Scalars := True;
8002                Initialize_Scalars := True;
8003             end if;
8004
8005          ------------
8006          -- Inline --
8007          ------------
8008
8009          --  pragma Inline ( NAME {, NAME} );
8010
8011          when Pragma_Inline =>
8012
8013             --  Pragma is active if inlining option is active
8014
8015             Process_Inline (Inline_Active);
8016
8017          -------------------
8018          -- Inline_Always --
8019          -------------------
8020
8021          --  pragma Inline_Always ( NAME {, NAME} );
8022
8023          when Pragma_Inline_Always =>
8024             GNAT_Pragma;
8025             Process_Inline (True);
8026
8027          --------------------
8028          -- Inline_Generic --
8029          --------------------
8030
8031          --  pragma Inline_Generic (NAME {, NAME});
8032
8033          when Pragma_Inline_Generic =>
8034             GNAT_Pragma;
8035             Process_Generic_List;
8036
8037          ----------------------
8038          -- Inspection_Point --
8039          ----------------------
8040
8041          --  pragma Inspection_Point [(object_NAME {, object_NAME})];
8042
8043          when Pragma_Inspection_Point => Inspection_Point : declare
8044             Arg : Node_Id;
8045             Exp : Node_Id;
8046
8047          begin
8048             if Arg_Count > 0 then
8049                Arg := Arg1;
8050                loop
8051                   Exp := Expression (Arg);
8052                   Analyze (Exp);
8053
8054                   if not Is_Entity_Name (Exp)
8055                     or else not Is_Object (Entity (Exp))
8056                   then
8057                      Error_Pragma_Arg ("object name required", Arg);
8058                   end if;
8059
8060                   Next (Arg);
8061                   exit when No (Arg);
8062                end loop;
8063             end if;
8064          end Inspection_Point;
8065
8066          ---------------
8067          -- Interface --
8068          ---------------
8069
8070          --  pragma Interface (
8071          --    [   Convention    =>] convention_IDENTIFIER,
8072          --    [   Entity        =>] local_NAME
8073          --    [, [External_Name =>] static_string_EXPRESSION ]
8074          --    [, [Link_Name     =>] static_string_EXPRESSION ]);
8075
8076          when Pragma_Interface =>
8077             GNAT_Pragma;
8078             Check_Arg_Order
8079               ((Name_Convention,
8080                 Name_Entity,
8081                 Name_External_Name,
8082                 Name_Link_Name));
8083             Check_At_Least_N_Arguments (2);
8084             Check_At_Most_N_Arguments  (4);
8085             Process_Import_Or_Interface;
8086
8087          --------------------
8088          -- Interface_Name --
8089          --------------------
8090
8091          --  pragma Interface_Name (
8092          --    [  Entity        =>] local_NAME
8093          --    [,[External_Name =>] static_string_EXPRESSION ]
8094          --    [,[Link_Name     =>] static_string_EXPRESSION ]);
8095
8096          when Pragma_Interface_Name => Interface_Name : declare
8097             Id     : Node_Id;
8098             Def_Id : Entity_Id;
8099             Hom_Id : Entity_Id;
8100             Found  : Boolean;
8101
8102          begin
8103             GNAT_Pragma;
8104             Check_Arg_Order
8105               ((Name_Entity, Name_External_Name, Name_Link_Name));
8106             Check_At_Least_N_Arguments (2);
8107             Check_At_Most_N_Arguments  (3);
8108             Id := Expression (Arg1);
8109             Analyze (Id);
8110
8111             if not Is_Entity_Name (Id) then
8112                Error_Pragma_Arg
8113                  ("first argument for pragma% must be entity name", Arg1);
8114             elsif Etype (Id) = Any_Type then
8115                return;
8116             else
8117                Def_Id := Entity (Id);
8118             end if;
8119
8120             --  Special DEC-compatible processing for the object case, forces
8121             --  object to be imported.
8122
8123             if Ekind (Def_Id) = E_Variable then
8124                Kill_Size_Check_Code (Def_Id);
8125                Note_Possible_Modification (Id, Sure => False);
8126
8127                --  Initialization is not allowed for imported variable
8128
8129                if Present (Expression (Parent (Def_Id)))
8130                  and then Comes_From_Source (Expression (Parent (Def_Id)))
8131                then
8132                   Error_Msg_Sloc := Sloc (Def_Id);
8133                   Error_Pragma_Arg
8134                     ("no initialization allowed for declaration of& #",
8135                      Arg2);
8136
8137                else
8138                   --  For compatibility, support VADS usage of providing both
8139                   --  pragmas Interface and Interface_Name to obtain the effect
8140                   --  of a single Import pragma.
8141
8142                   if Is_Imported (Def_Id)
8143                     and then Present (First_Rep_Item (Def_Id))
8144                     and then Nkind (First_Rep_Item (Def_Id)) = N_Pragma
8145                     and then
8146                       Pragma_Name (First_Rep_Item (Def_Id)) = Name_Interface
8147                   then
8148                      null;
8149                   else
8150                      Set_Imported (Def_Id);
8151                   end if;
8152
8153                   Set_Is_Public (Def_Id);
8154                   Process_Interface_Name (Def_Id, Arg2, Arg3);
8155                end if;
8156
8157             --  Otherwise must be subprogram
8158
8159             elsif not Is_Subprogram (Def_Id) then
8160                Error_Pragma_Arg
8161                  ("argument of pragma% is not subprogram", Arg1);
8162
8163             else
8164                Check_At_Most_N_Arguments (3);
8165                Hom_Id := Def_Id;
8166                Found := False;
8167
8168                --  Loop through homonyms
8169
8170                loop
8171                   Def_Id := Get_Base_Subprogram (Hom_Id);
8172
8173                   if Is_Imported (Def_Id) then
8174                      Process_Interface_Name (Def_Id, Arg2, Arg3);
8175                      Found := True;
8176                   end if;
8177
8178                   Hom_Id := Homonym (Hom_Id);
8179
8180                   exit when No (Hom_Id)
8181                     or else Scope (Hom_Id) /= Current_Scope;
8182                end loop;
8183
8184                if not Found then
8185                   Error_Pragma_Arg
8186                     ("argument of pragma% is not imported subprogram",
8187                      Arg1);
8188                end if;
8189             end if;
8190          end Interface_Name;
8191
8192          -----------------------
8193          -- Interrupt_Handler --
8194          -----------------------
8195
8196          --  pragma Interrupt_Handler (handler_NAME);
8197
8198          when Pragma_Interrupt_Handler =>
8199             Check_Ada_83_Warning;
8200             Check_Arg_Count (1);
8201             Check_No_Identifiers;
8202
8203             if No_Run_Time_Mode then
8204                Error_Msg_CRT ("Interrupt_Handler pragma", N);
8205             else
8206                Check_Interrupt_Or_Attach_Handler;
8207                Process_Interrupt_Or_Attach_Handler;
8208             end if;
8209
8210          ------------------------
8211          -- Interrupt_Priority --
8212          ------------------------
8213
8214          --  pragma Interrupt_Priority [(EXPRESSION)];
8215
8216          when Pragma_Interrupt_Priority => Interrupt_Priority : declare
8217             P   : constant Node_Id := Parent (N);
8218             Arg : Node_Id;
8219
8220          begin
8221             Check_Ada_83_Warning;
8222
8223             if Arg_Count /= 0 then
8224                Arg := Expression (Arg1);
8225                Check_Arg_Count (1);
8226                Check_No_Identifiers;
8227
8228                --  The expression must be analyzed in the special manner
8229                --  described in "Handling of Default and Per-Object
8230                --  Expressions" in sem.ads.
8231
8232                Preanalyze_Spec_Expression (Arg, RTE (RE_Interrupt_Priority));
8233             end if;
8234
8235             if not Nkind_In (P, N_Task_Definition, N_Protected_Definition) then
8236                Pragma_Misplaced;
8237                return;
8238
8239             elsif Has_Priority_Pragma (P) then
8240                Error_Pragma ("duplicate pragma% not allowed");
8241
8242             else
8243                Set_Has_Priority_Pragma (P, True);
8244                Record_Rep_Item (Defining_Identifier (Parent (P)), N);
8245             end if;
8246          end Interrupt_Priority;
8247
8248          ---------------------
8249          -- Interrupt_State --
8250          ---------------------
8251
8252          --  pragma Interrupt_State (
8253          --    [Name  =>] INTERRUPT_ID,
8254          --    [State =>] INTERRUPT_STATE);
8255
8256          --  INTERRUPT_ID => IDENTIFIER | static_integer_EXPRESSION
8257          --  INTERRUPT_STATE => System | Runtime | User
8258
8259          --  Note: if the interrupt id is given as an identifier, then it must
8260          --  be one of the identifiers in Ada.Interrupts.Names. Otherwise it is
8261          --  given as a static integer expression which must be in the range of
8262          --  Ada.Interrupts.Interrupt_ID.
8263
8264          when Pragma_Interrupt_State => Interrupt_State : declare
8265
8266             Int_Id : constant Entity_Id := RTE (RE_Interrupt_ID);
8267             --  This is the entity Ada.Interrupts.Interrupt_ID;
8268
8269             State_Type : Character;
8270             --  Set to 's'/'r'/'u' for System/Runtime/User
8271
8272             IST_Num : Pos;
8273             --  Index to entry in Interrupt_States table
8274
8275             Int_Val : Uint;
8276             --  Value of interrupt
8277
8278             Arg1X : constant Node_Id := Get_Pragma_Arg (Arg1);
8279             --  The first argument to the pragma
8280
8281             Int_Ent : Entity_Id;
8282             --  Interrupt entity in Ada.Interrupts.Names
8283
8284          begin
8285             GNAT_Pragma;
8286             Check_Arg_Order ((Name_Name, Name_State));
8287             Check_Arg_Count (2);
8288
8289             Check_Optional_Identifier (Arg1, Name_Name);
8290             Check_Optional_Identifier (Arg2, Name_State);
8291             Check_Arg_Is_Identifier (Arg2);
8292
8293             --  First argument is identifier
8294
8295             if Nkind (Arg1X) = N_Identifier then
8296
8297                --  Search list of names in Ada.Interrupts.Names
8298
8299                Int_Ent := First_Entity (RTE (RE_Names));
8300                loop
8301                   if No (Int_Ent) then
8302                      Error_Pragma_Arg ("invalid interrupt name", Arg1);
8303
8304                   elsif Chars (Int_Ent) = Chars (Arg1X) then
8305                      Int_Val := Expr_Value (Constant_Value (Int_Ent));
8306                      exit;
8307                   end if;
8308
8309                   Next_Entity (Int_Ent);
8310                end loop;
8311
8312             --  First argument is not an identifier, so it must be a static
8313             --  expression of type Ada.Interrupts.Interrupt_ID.
8314
8315             else
8316                Check_Arg_Is_Static_Expression (Arg1, Any_Integer);
8317                Int_Val := Expr_Value (Arg1X);
8318
8319                if Int_Val < Expr_Value (Type_Low_Bound (Int_Id))
8320                     or else
8321                   Int_Val > Expr_Value (Type_High_Bound (Int_Id))
8322                then
8323                   Error_Pragma_Arg
8324                     ("value not in range of type " &
8325                      """Ada.Interrupts.Interrupt_'I'D""", Arg1);
8326                end if;
8327             end if;
8328
8329             --  Check OK state
8330
8331             case Chars (Get_Pragma_Arg (Arg2)) is
8332                when Name_Runtime => State_Type := 'r';
8333                when Name_System  => State_Type := 's';
8334                when Name_User    => State_Type := 'u';
8335
8336                when others =>
8337                   Error_Pragma_Arg ("invalid interrupt state", Arg2);
8338             end case;
8339
8340             --  Check if entry is already stored
8341
8342             IST_Num := Interrupt_States.First;
8343             loop
8344                --  If entry not found, add it
8345
8346                if IST_Num > Interrupt_States.Last then
8347                   Interrupt_States.Append
8348                     ((Interrupt_Number => UI_To_Int (Int_Val),
8349                       Interrupt_State  => State_Type,
8350                       Pragma_Loc       => Loc));
8351                   exit;
8352
8353                --  Case of entry for the same entry
8354
8355                elsif Int_Val = Interrupt_States.Table (IST_Num).
8356                                                            Interrupt_Number
8357                then
8358                   --  If state matches, done, no need to make redundant entry
8359
8360                   exit when
8361                     State_Type = Interrupt_States.Table (IST_Num).
8362                                                            Interrupt_State;
8363
8364                   --  Otherwise if state does not match, error
8365
8366                   Error_Msg_Sloc :=
8367                     Interrupt_States.Table (IST_Num).Pragma_Loc;
8368                   Error_Pragma_Arg
8369                     ("state conflicts with that given #", Arg2);
8370                   exit;
8371                end if;
8372
8373                IST_Num := IST_Num + 1;
8374             end loop;
8375          end Interrupt_State;
8376
8377          ----------------------
8378          -- Java_Constructor --
8379          ----------------------
8380
8381          --  pragma Java_Constructor ([Entity =>] LOCAL_NAME);
8382
8383          --  Also handles pragma CIL_Constructor
8384
8385          when Pragma_CIL_Constructor | Pragma_Java_Constructor =>
8386          Java_Constructor : declare
8387             Id         : Entity_Id;
8388             Def_Id     : Entity_Id;
8389             Hom_Id     : Entity_Id;
8390             Convention : Convention_Id;
8391
8392          begin
8393             GNAT_Pragma;
8394             Check_Arg_Count (1);
8395             Check_Optional_Identifier (Arg1, Name_Entity);
8396             Check_Arg_Is_Local_Name (Arg1);
8397
8398             Id := Expression (Arg1);
8399             Find_Program_Unit_Name (Id);
8400
8401             --  If we did not find the name, we are done
8402
8403             if Etype (Id) = Any_Type then
8404                return;
8405             end if;
8406
8407             case Prag_Id is
8408                when Pragma_CIL_Constructor  => Convention := Convention_CIL;
8409                when Pragma_Java_Constructor => Convention := Convention_Java;
8410                when others                  => null;
8411             end case;
8412
8413             Hom_Id := Entity (Id);
8414
8415             --  Loop through homonyms
8416
8417             loop
8418                Def_Id := Get_Base_Subprogram (Hom_Id);
8419
8420                --  The constructor is required to be a function returning an
8421                --  access type whose designated type has convention Java/CIL.
8422
8423                if Ekind (Def_Id) = E_Function
8424                  and then
8425                    (Is_Value_Type (Etype (Def_Id))
8426                      or else
8427                        (Ekind (Etype (Def_Id)) = E_Access_Subprogram_Type
8428                          and then
8429                           Atree.Convention (Etype (Def_Id)) = Convention)
8430                      or else
8431                        (Ekind (Etype (Def_Id)) in Access_Kind
8432                          and then
8433                           (Atree.Convention
8434                              (Designated_Type (Etype (Def_Id))) = Convention
8435                             or else
8436                               Atree.Convention
8437                                (Root_Type (Designated_Type (Etype (Def_Id)))) =
8438                                                                  Convention)))
8439                then
8440                   Set_Is_Constructor (Def_Id);
8441                   Set_Convention     (Def_Id, Convention);
8442                   Set_Is_Imported    (Def_Id);
8443
8444                else
8445                   if Convention = Convention_Java then
8446                      Error_Pragma_Arg
8447                        ("pragma% requires function returning a " &
8448                         "'Java access type", Arg1);
8449                   else
8450                      pragma Assert (Convention = Convention_CIL);
8451                      Error_Pragma_Arg
8452                        ("pragma% requires function returning a " &
8453                         "'C'I'L access type", Arg1);
8454                   end if;
8455                end if;
8456
8457                Hom_Id := Homonym (Hom_Id);
8458
8459                exit when No (Hom_Id) or else Scope (Hom_Id) /= Current_Scope;
8460             end loop;
8461          end Java_Constructor;
8462
8463          ----------------------
8464          -- Java_Interface --
8465          ----------------------
8466
8467          --  pragma Java_Interface ([Entity =>] LOCAL_NAME);
8468
8469          when Pragma_Java_Interface => Java_Interface : declare
8470             Arg : Node_Id;
8471             Typ : Entity_Id;
8472
8473          begin
8474             GNAT_Pragma;
8475             Check_Arg_Count (1);
8476             Check_Optional_Identifier (Arg1, Name_Entity);
8477             Check_Arg_Is_Local_Name (Arg1);
8478
8479             Arg := Expression (Arg1);
8480             Analyze (Arg);
8481
8482             if Etype (Arg) = Any_Type then
8483                return;
8484             end if;
8485
8486             if not Is_Entity_Name (Arg)
8487               or else not Is_Type (Entity (Arg))
8488             then
8489                Error_Pragma_Arg ("pragma% requires a type mark", Arg1);
8490             end if;
8491
8492             Typ := Underlying_Type (Entity (Arg));
8493
8494             --  For now simply check some of the semantic constraints on the
8495             --  type. This currently leaves out some restrictions on interface
8496             --  types, namely that the parent type must be java.lang.Object.Typ
8497             --  and that all primitives of the type should be declared
8498             --  abstract. ???
8499
8500             if not Is_Tagged_Type (Typ) or else not Is_Abstract_Type (Typ) then
8501                Error_Pragma_Arg ("pragma% requires an abstract "
8502                  & "tagged type", Arg1);
8503
8504             elsif not Has_Discriminants (Typ)
8505               or else Ekind (Etype (First_Discriminant (Typ)))
8506                         /= E_Anonymous_Access_Type
8507               or else
8508                 not Is_Class_Wide_Type
8509                       (Designated_Type (Etype (First_Discriminant (Typ))))
8510             then
8511                Error_Pragma_Arg
8512                  ("type must have a class-wide access discriminant", Arg1);
8513             end if;
8514          end Java_Interface;
8515
8516          ----------------
8517          -- Keep_Names --
8518          ----------------
8519
8520          --  pragma Keep_Names ([On => ] local_NAME);
8521
8522          when Pragma_Keep_Names => Keep_Names : declare
8523             Arg : Node_Id;
8524
8525          begin
8526             GNAT_Pragma;
8527             Check_Arg_Count (1);
8528             Check_Optional_Identifier (Arg1, Name_On);
8529             Check_Arg_Is_Local_Name (Arg1);
8530
8531             Arg := Expression (Arg1);
8532             Analyze (Arg);
8533
8534             if Etype (Arg) = Any_Type then
8535                return;
8536             end if;
8537
8538             if not Is_Entity_Name (Arg)
8539               or else Ekind (Entity (Arg)) /= E_Enumeration_Type
8540             then
8541                Error_Pragma_Arg
8542                  ("pragma% requires a local enumeration type", Arg1);
8543             end if;
8544
8545             Set_Discard_Names (Entity (Arg), False);
8546          end Keep_Names;
8547
8548          -------------
8549          -- License --
8550          -------------
8551
8552          --  pragma License (RESTRICTED | UNRESTRICTED | GPL | MODIFIED_GPL);
8553
8554          when Pragma_License =>
8555             GNAT_Pragma;
8556             Check_Arg_Count (1);
8557             Check_No_Identifiers;
8558             Check_Valid_Configuration_Pragma;
8559             Check_Arg_Is_Identifier (Arg1);
8560
8561             declare
8562                Sind : constant Source_File_Index :=
8563                         Source_Index (Current_Sem_Unit);
8564
8565             begin
8566                case Chars (Get_Pragma_Arg (Arg1)) is
8567                   when Name_GPL =>
8568                      Set_License (Sind, GPL);
8569
8570                   when Name_Modified_GPL =>
8571                      Set_License (Sind, Modified_GPL);
8572
8573                   when Name_Restricted =>
8574                      Set_License (Sind, Restricted);
8575
8576                   when Name_Unrestricted =>
8577                      Set_License (Sind, Unrestricted);
8578
8579                   when others =>
8580                      Error_Pragma_Arg ("invalid license name", Arg1);
8581                end case;
8582             end;
8583
8584          ---------------
8585          -- Link_With --
8586          ---------------
8587
8588          --  pragma Link_With (string_EXPRESSION {, string_EXPRESSION});
8589
8590          when Pragma_Link_With => Link_With : declare
8591             Arg : Node_Id;
8592
8593          begin
8594             GNAT_Pragma;
8595
8596             if Operating_Mode = Generate_Code
8597               and then In_Extended_Main_Source_Unit (N)
8598             then
8599                Check_At_Least_N_Arguments (1);
8600                Check_No_Identifiers;
8601                Check_Is_In_Decl_Part_Or_Package_Spec;
8602                Check_Arg_Is_Static_Expression (Arg1, Standard_String);
8603                Start_String;
8604
8605                Arg := Arg1;
8606                while Present (Arg) loop
8607                   Check_Arg_Is_Static_Expression (Arg, Standard_String);
8608
8609                   --  Store argument, converting sequences of spaces to a
8610                   --  single null character (this is one of the differences
8611                   --  in processing between Link_With and Linker_Options).
8612
8613                   Arg_Store : declare
8614                      C : constant Char_Code := Get_Char_Code (' ');
8615                      S : constant String_Id :=
8616                            Strval (Expr_Value_S (Expression (Arg)));
8617                      L : constant Nat := String_Length (S);
8618                      F : Nat := 1;
8619
8620                      procedure Skip_Spaces;
8621                      --  Advance F past any spaces
8622
8623                      -----------------
8624                      -- Skip_Spaces --
8625                      -----------------
8626
8627                      procedure Skip_Spaces is
8628                      begin
8629                         while F <= L and then Get_String_Char (S, F) = C loop
8630                            F := F + 1;
8631                         end loop;
8632                      end Skip_Spaces;
8633
8634                   --  Start of processing for Arg_Store
8635
8636                   begin
8637                      Skip_Spaces; -- skip leading spaces
8638
8639                      --  Loop through characters, changing any embedded
8640                      --  sequence of spaces to a single null character (this
8641                      --  is how Link_With/Linker_Options differ)
8642
8643                      while F <= L loop
8644                         if Get_String_Char (S, F) = C then
8645                            Skip_Spaces;
8646                            exit when F > L;
8647                            Store_String_Char (ASCII.NUL);
8648
8649                         else
8650                            Store_String_Char (Get_String_Char (S, F));
8651                            F := F + 1;
8652                         end if;
8653                      end loop;
8654                   end Arg_Store;
8655
8656                   Arg := Next (Arg);
8657
8658                   if Present (Arg) then
8659                      Store_String_Char (ASCII.NUL);
8660                   end if;
8661                end loop;
8662
8663                Store_Linker_Option_String (End_String);
8664             end if;
8665          end Link_With;
8666
8667          ------------------
8668          -- Linker_Alias --
8669          ------------------
8670
8671          --  pragma Linker_Alias (
8672          --      [Entity =>]  LOCAL_NAME
8673          --      [Target =>]  static_string_EXPRESSION);
8674
8675          when Pragma_Linker_Alias =>
8676             GNAT_Pragma;
8677             Check_Arg_Order ((Name_Entity, Name_Target));
8678             Check_Arg_Count (2);
8679             Check_Optional_Identifier (Arg1, Name_Entity);
8680             Check_Optional_Identifier (Arg2, Name_Target);
8681             Check_Arg_Is_Library_Level_Local_Name (Arg1);
8682             Check_Arg_Is_Static_Expression (Arg2, Standard_String);
8683
8684             --  The only processing required is to link this item on to the
8685             --  list of rep items for the given entity. This is accomplished
8686             --  by the call to Rep_Item_Too_Late (when no error is detected
8687             --  and False is returned).
8688
8689             if Rep_Item_Too_Late (Entity (Expression (Arg1)), N) then
8690                return;
8691             else
8692                Set_Has_Gigi_Rep_Item (Entity (Expression (Arg1)));
8693             end if;
8694
8695          ------------------------
8696          -- Linker_Constructor --
8697          ------------------------
8698
8699          --  pragma Linker_Constructor (procedure_LOCAL_NAME);
8700
8701          --  Code is shared with Linker_Destructor
8702
8703          -----------------------
8704          -- Linker_Destructor --
8705          -----------------------
8706
8707          --  pragma Linker_Destructor (procedure_LOCAL_NAME);
8708
8709          when Pragma_Linker_Constructor |
8710               Pragma_Linker_Destructor =>
8711          Linker_Constructor : declare
8712             Arg1_X : Node_Id;
8713             Proc   : Entity_Id;
8714
8715          begin
8716             GNAT_Pragma;
8717             Check_Arg_Count (1);
8718             Check_No_Identifiers;
8719             Check_Arg_Is_Local_Name (Arg1);
8720             Arg1_X := Expression (Arg1);
8721             Analyze (Arg1_X);
8722             Proc := Find_Unique_Parameterless_Procedure (Arg1_X, Arg1);
8723
8724             if not Is_Library_Level_Entity (Proc) then
8725                Error_Pragma_Arg
8726                 ("argument for pragma% must be library level entity", Arg1);
8727             end if;
8728
8729             --  The only processing required is to link this item on to the
8730             --  list of rep items for the given entity. This is accomplished
8731             --  by the call to Rep_Item_Too_Late (when no error is detected
8732             --  and False is returned).
8733
8734             if Rep_Item_Too_Late (Proc, N) then
8735                return;
8736             else
8737                Set_Has_Gigi_Rep_Item (Proc);
8738             end if;
8739          end Linker_Constructor;
8740
8741          --------------------
8742          -- Linker_Options --
8743          --------------------
8744
8745          --  pragma Linker_Options (string_EXPRESSION {, string_EXPRESSION});
8746
8747          when Pragma_Linker_Options => Linker_Options : declare
8748             Arg : Node_Id;
8749
8750          begin
8751             Check_Ada_83_Warning;
8752             Check_No_Identifiers;
8753             Check_Arg_Count (1);
8754             Check_Is_In_Decl_Part_Or_Package_Spec;
8755             Check_Arg_Is_Static_Expression (Arg1, Standard_String);
8756             Start_String (Strval (Expr_Value_S (Expression (Arg1))));
8757
8758             Arg := Arg2;
8759             while Present (Arg) loop
8760                Check_Arg_Is_Static_Expression (Arg, Standard_String);
8761                Store_String_Char (ASCII.NUL);
8762                Store_String_Chars (Strval (Expr_Value_S (Expression (Arg))));
8763                Arg := Next (Arg);
8764             end loop;
8765
8766             if Operating_Mode = Generate_Code
8767               and then In_Extended_Main_Source_Unit (N)
8768             then
8769                Store_Linker_Option_String (End_String);
8770             end if;
8771          end Linker_Options;
8772
8773          --------------------
8774          -- Linker_Section --
8775          --------------------
8776
8777          --  pragma Linker_Section (
8778          --      [Entity  =>]  LOCAL_NAME
8779          --      [Section =>]  static_string_EXPRESSION);
8780
8781          when Pragma_Linker_Section =>
8782             GNAT_Pragma;
8783             Check_Arg_Order ((Name_Entity, Name_Section));
8784             Check_Arg_Count (2);
8785             Check_Optional_Identifier (Arg1, Name_Entity);
8786             Check_Optional_Identifier (Arg2, Name_Section);
8787             Check_Arg_Is_Library_Level_Local_Name (Arg1);
8788             Check_Arg_Is_Static_Expression (Arg2, Standard_String);
8789
8790             --  This pragma applies only to objects
8791
8792             if not Is_Object (Entity (Expression (Arg1))) then
8793                Error_Pragma_Arg ("pragma% applies only to objects", Arg1);
8794             end if;
8795
8796             --  The only processing required is to link this item on to the
8797             --  list of rep items for the given entity. This is accomplished
8798             --  by the call to Rep_Item_Too_Late (when no error is detected
8799             --  and False is returned).
8800
8801             if Rep_Item_Too_Late (Entity (Expression (Arg1)), N) then
8802                return;
8803             else
8804                Set_Has_Gigi_Rep_Item (Entity (Expression (Arg1)));
8805             end if;
8806
8807          ----------
8808          -- List --
8809          ----------
8810
8811          --  pragma List (On | Off)
8812
8813          --  There is nothing to do here, since we did all the processing for
8814          --  this pragma in Par.Prag (so that it works properly even in syntax
8815          --  only mode).
8816
8817          when Pragma_List =>
8818             null;
8819
8820          --------------------
8821          -- Locking_Policy --
8822          --------------------
8823
8824          --  pragma Locking_Policy (policy_IDENTIFIER);
8825
8826          when Pragma_Locking_Policy => declare
8827             LP : Character;
8828
8829          begin
8830             Check_Ada_83_Warning;
8831             Check_Arg_Count (1);
8832             Check_No_Identifiers;
8833             Check_Arg_Is_Locking_Policy (Arg1);
8834             Check_Valid_Configuration_Pragma;
8835             Get_Name_String (Chars (Expression (Arg1)));
8836             LP := Fold_Upper (Name_Buffer (1));
8837
8838             if Locking_Policy /= ' '
8839               and then Locking_Policy /= LP
8840             then
8841                Error_Msg_Sloc := Locking_Policy_Sloc;
8842                Error_Pragma ("locking policy incompatible with policy#");
8843
8844             --  Set new policy, but always preserve System_Location since we
8845             --  like the error message with the run time name.
8846
8847             else
8848                Locking_Policy := LP;
8849
8850                if Locking_Policy_Sloc /= System_Location then
8851                   Locking_Policy_Sloc := Loc;
8852                end if;
8853             end if;
8854          end;
8855
8856          ----------------
8857          -- Long_Float --
8858          ----------------
8859
8860          --  pragma Long_Float (D_Float | G_Float);
8861
8862          when Pragma_Long_Float =>
8863             GNAT_Pragma;
8864             Check_Valid_Configuration_Pragma;
8865             Check_Arg_Count (1);
8866             Check_No_Identifier (Arg1);
8867             Check_Arg_Is_One_Of (Arg1, Name_D_Float, Name_G_Float);
8868
8869             if not OpenVMS_On_Target then
8870                Error_Pragma ("?pragma% ignored (applies only to Open'V'M'S)");
8871             end if;
8872
8873             --  D_Float case
8874
8875             if Chars (Expression (Arg1)) = Name_D_Float then
8876                if Opt.Float_Format_Long = 'G' then
8877                   Error_Pragma ("G_Float previously specified");
8878                end if;
8879
8880                Opt.Float_Format_Long := 'D';
8881
8882             --  G_Float case (this is the default, does not need overriding)
8883
8884             else
8885                if Opt.Float_Format_Long = 'D' then
8886                   Error_Pragma ("D_Float previously specified");
8887                end if;
8888
8889                Opt.Float_Format_Long := 'G';
8890             end if;
8891
8892             Set_Standard_Fpt_Formats;
8893
8894          -----------------------
8895          -- Machine_Attribute --
8896          -----------------------
8897
8898          --  pragma Machine_Attribute (
8899          --       [Entity         =>] LOCAL_NAME,
8900          --       [Attribute_Name =>] static_string_EXPRESSION
8901          --    [, [Info           =>] static_EXPRESSION] );
8902
8903          when Pragma_Machine_Attribute => Machine_Attribute : declare
8904             Def_Id : Entity_Id;
8905
8906          begin
8907             GNAT_Pragma;
8908             Check_Arg_Order ((Name_Entity, Name_Attribute_Name, Name_Info));
8909
8910             if Arg_Count = 3 then
8911                Check_Optional_Identifier (Arg3, Name_Info);
8912                Check_Arg_Is_Static_Expression (Arg3);
8913             else
8914                Check_Arg_Count (2);
8915             end if;
8916
8917             Check_Optional_Identifier (Arg1, Name_Entity);
8918             Check_Optional_Identifier (Arg2, Name_Attribute_Name);
8919             Check_Arg_Is_Local_Name (Arg1);
8920             Check_Arg_Is_Static_Expression (Arg2, Standard_String);
8921             Def_Id := Entity (Expression (Arg1));
8922
8923             if Is_Access_Type (Def_Id) then
8924                Def_Id := Designated_Type (Def_Id);
8925             end if;
8926
8927             if Rep_Item_Too_Early (Def_Id, N) then
8928                return;
8929             end if;
8930
8931             Def_Id := Underlying_Type (Def_Id);
8932
8933             --  The only processing required is to link this item on to the
8934             --  list of rep items for the given entity. This is accomplished
8935             --  by the call to Rep_Item_Too_Late (when no error is detected
8936             --  and False is returned).
8937
8938             if Rep_Item_Too_Late (Def_Id, N) then
8939                return;
8940             else
8941                Set_Has_Gigi_Rep_Item (Entity (Expression (Arg1)));
8942             end if;
8943          end Machine_Attribute;
8944
8945          ----------
8946          -- Main --
8947          ----------
8948
8949          --  pragma Main
8950          --   (MAIN_OPTION [, MAIN_OPTION]);
8951
8952          --  MAIN_OPTION ::=
8953          --    [STACK_SIZE              =>] static_integer_EXPRESSION
8954          --  | [TASK_STACK_SIZE_DEFAULT =>] static_integer_EXPRESSION
8955          --  | [TIME_SLICING_ENABLED    =>] static_boolean_EXPRESSION
8956
8957          when Pragma_Main => Main : declare
8958             Args  : Args_List (1 .. 3);
8959             Names : constant Name_List (1 .. 3) := (
8960                       Name_Stack_Size,
8961                       Name_Task_Stack_Size_Default,
8962                       Name_Time_Slicing_Enabled);
8963
8964             Nod : Node_Id;
8965
8966          begin
8967             GNAT_Pragma;
8968             Gather_Associations (Names, Args);
8969
8970             for J in 1 .. 2 loop
8971                if Present (Args (J)) then
8972                   Check_Arg_Is_Static_Expression (Args (J), Any_Integer);
8973                end if;
8974             end loop;
8975
8976             if Present (Args (3)) then
8977                Check_Arg_Is_Static_Expression (Args (3), Standard_Boolean);
8978             end if;
8979
8980             Nod := Next (N);
8981             while Present (Nod) loop
8982                if Nkind (Nod) = N_Pragma
8983                  and then Pragma_Name (Nod) = Name_Main
8984                then
8985                   Error_Msg_Name_1 := Pname;
8986                   Error_Msg_N ("duplicate pragma% not permitted", Nod);
8987                end if;
8988
8989                Next (Nod);
8990             end loop;
8991          end Main;
8992
8993          ------------------
8994          -- Main_Storage --
8995          ------------------
8996
8997          --  pragma Main_Storage
8998          --   (MAIN_STORAGE_OPTION [, MAIN_STORAGE_OPTION]);
8999
9000          --  MAIN_STORAGE_OPTION ::=
9001          --    [WORKING_STORAGE =>] static_SIMPLE_EXPRESSION
9002          --  | [TOP_GUARD =>] static_SIMPLE_EXPRESSION
9003
9004          when Pragma_Main_Storage => Main_Storage : declare
9005             Args  : Args_List (1 .. 2);
9006             Names : constant Name_List (1 .. 2) := (
9007                       Name_Working_Storage,
9008                       Name_Top_Guard);
9009
9010             Nod : Node_Id;
9011
9012          begin
9013             GNAT_Pragma;
9014             Gather_Associations (Names, Args);
9015
9016             for J in 1 .. 2 loop
9017                if Present (Args (J)) then
9018                   Check_Arg_Is_Static_Expression (Args (J), Any_Integer);
9019                end if;
9020             end loop;
9021
9022             Check_In_Main_Program;
9023
9024             Nod := Next (N);
9025             while Present (Nod) loop
9026                if Nkind (Nod) = N_Pragma
9027                  and then Pragma_Name (Nod) = Name_Main_Storage
9028                then
9029                   Error_Msg_Name_1 := Pname;
9030                   Error_Msg_N ("duplicate pragma% not permitted", Nod);
9031                end if;
9032
9033                Next (Nod);
9034             end loop;
9035          end Main_Storage;
9036
9037          -----------------
9038          -- Memory_Size --
9039          -----------------
9040
9041          --  pragma Memory_Size (NUMERIC_LITERAL)
9042
9043          when Pragma_Memory_Size =>
9044             GNAT_Pragma;
9045
9046             --  Memory size is simply ignored
9047
9048             Check_No_Identifiers;
9049             Check_Arg_Count (1);
9050             Check_Arg_Is_Integer_Literal (Arg1);
9051
9052          -------------
9053          -- No_Body --
9054          -------------
9055
9056          --  pragma No_Body;
9057
9058          --  The only correct use of this pragma is on its own in a file, in
9059          --  which case it is specially processed (see Gnat1drv.Check_Bad_Body
9060          --  and Frontend, which use Sinput.L.Source_File_Is_Pragma_No_Body to
9061          --  check for a file containing nothing but a No_Body pragma). If we
9062          --  attempt to process it during normal semantics processing, it means
9063          --  it was misplaced.
9064
9065          when Pragma_No_Body =>
9066             GNAT_Pragma;
9067             Pragma_Misplaced;
9068
9069          ---------------
9070          -- No_Return --
9071          ---------------
9072
9073          --  pragma No_Return (procedure_LOCAL_NAME {, procedure_Local_Name});
9074
9075          when Pragma_No_Return => No_Return : declare
9076             Id    : Node_Id;
9077             E     : Entity_Id;
9078             Found : Boolean;
9079             Arg   : Node_Id;
9080
9081          begin
9082             Ada_2005_Pragma;
9083             Check_At_Least_N_Arguments (1);
9084
9085             --  Loop through arguments of pragma
9086
9087             Arg := Arg1;
9088             while Present (Arg) loop
9089                Check_Arg_Is_Local_Name (Arg);
9090                Id := Expression (Arg);
9091                Analyze (Id);
9092
9093                if not Is_Entity_Name (Id) then
9094                   Error_Pragma_Arg ("entity name required", Arg);
9095                end if;
9096
9097                if Etype (Id) = Any_Type then
9098                   raise Pragma_Exit;
9099                end if;
9100
9101                --  Loop to find matching procedures
9102
9103                E := Entity (Id);
9104                Found := False;
9105                while Present (E)
9106                  and then Scope (E) = Current_Scope
9107                loop
9108                   if Ekind (E) = E_Procedure
9109                     or else Ekind (E) = E_Generic_Procedure
9110                   then
9111                      Set_No_Return (E);
9112
9113                      --  Set flag on any alias as well
9114
9115                      if Is_Overloadable (E) and then Present (Alias (E)) then
9116                         Set_No_Return (Alias (E));
9117                      end if;
9118
9119                      Found := True;
9120                   end if;
9121
9122                   E := Homonym (E);
9123                end loop;
9124
9125                if not Found then
9126                   Error_Pragma_Arg ("no procedure & found for pragma%", Arg);
9127                end if;
9128
9129                Next (Arg);
9130             end loop;
9131          end No_Return;
9132
9133          -----------------
9134          -- No_Run_Time --
9135          -----------------
9136
9137          --  pragma No_Run_Time;
9138
9139          --  Note: this pragma is retained for backwards compatibility. See
9140          --  body of Rtsfind for full details on its handling.
9141
9142          when Pragma_No_Run_Time =>
9143             GNAT_Pragma;
9144             Check_Valid_Configuration_Pragma;
9145             Check_Arg_Count (0);
9146
9147             No_Run_Time_Mode           := True;
9148             Configurable_Run_Time_Mode := True;
9149
9150             --  Set Duration to 32 bits if word size is 32
9151
9152             if Ttypes.System_Word_Size = 32 then
9153                Duration_32_Bits_On_Target := True;
9154             end if;
9155
9156             --  Set appropriate restrictions
9157
9158             Set_Restriction (No_Finalization, N);
9159             Set_Restriction (No_Exception_Handlers, N);
9160             Set_Restriction (Max_Tasks, N, 0);
9161             Set_Restriction (No_Tasking, N);
9162
9163          ------------------------
9164          -- No_Strict_Aliasing --
9165          ------------------------
9166
9167          --  pragma No_Strict_Aliasing [([Entity =>] type_LOCAL_NAME)];
9168
9169          when Pragma_No_Strict_Aliasing => No_Strict_Aliasing : declare
9170             E_Id : Entity_Id;
9171
9172          begin
9173             GNAT_Pragma;
9174             Check_At_Most_N_Arguments (1);
9175
9176             if Arg_Count = 0 then
9177                Check_Valid_Configuration_Pragma;
9178                Opt.No_Strict_Aliasing := True;
9179
9180             else
9181                Check_Optional_Identifier (Arg2, Name_Entity);
9182                Check_Arg_Is_Local_Name (Arg1);
9183                E_Id := Entity (Expression (Arg1));
9184
9185                if E_Id = Any_Type then
9186                   return;
9187                elsif No (E_Id) or else not Is_Access_Type (E_Id) then
9188                   Error_Pragma_Arg ("pragma% requires access type", Arg1);
9189                end if;
9190
9191                Set_No_Strict_Aliasing (Implementation_Base_Type (E_Id));
9192             end if;
9193          end No_Strict_Aliasing;
9194
9195          -----------------------
9196          -- Normalize_Scalars --
9197          -----------------------
9198
9199          --  pragma Normalize_Scalars;
9200
9201          when Pragma_Normalize_Scalars =>
9202             Check_Ada_83_Warning;
9203             Check_Arg_Count (0);
9204             Check_Valid_Configuration_Pragma;
9205
9206             --  Normalize_Scalars creates false positives in CodePeer, so
9207             --  ignore this pragma in this mode.
9208
9209             if not CodePeer_Mode then
9210                Normalize_Scalars := True;
9211                Init_Or_Norm_Scalars := True;
9212             end if;
9213
9214          -----------------
9215          -- Obsolescent --
9216          -----------------
9217
9218          --  pragma Obsolescent;
9219
9220          --  pragma Obsolescent (
9221          --    [Message =>] static_string_EXPRESSION
9222          --  [,[Version =>] Ada_05]]);
9223
9224          --  pragma Obsolescent (
9225          --    [Entity  =>] NAME
9226          --  [,[Message =>] static_string_EXPRESSION
9227          --  [,[Version =>] Ada_05]] );
9228
9229          when Pragma_Obsolescent => Obsolescent : declare
9230             Ename : Node_Id;
9231             Decl  : Node_Id;
9232
9233             procedure Set_Obsolescent (E : Entity_Id);
9234             --  Given an entity Ent, mark it as obsolescent if appropriate
9235
9236             ---------------------
9237             -- Set_Obsolescent --
9238             ---------------------
9239
9240             procedure Set_Obsolescent (E : Entity_Id) is
9241                Active : Boolean;
9242                Ent    : Entity_Id;
9243                S      : String_Id;
9244
9245             begin
9246                Active := True;
9247                Ent    := E;
9248
9249                --  Entity name was given
9250
9251                if Present (Ename) then
9252
9253                   --  If entity name matches, we are fine. Save entity in
9254                   --  pragma argument, for ASIS use.
9255
9256                   if Chars (Ename) = Chars (Ent) then
9257                      Set_Entity (Ename, Ent);
9258                      Generate_Reference (Ent, Ename);
9259
9260                   --  If entity name does not match, only possibility is an
9261                   --  enumeration literal from an enumeration type declaration.
9262
9263                   elsif Ekind (Ent) /= E_Enumeration_Type then
9264                      Error_Pragma
9265                        ("pragma % entity name does not match declaration");
9266
9267                   else
9268                      Ent := First_Literal (E);
9269                      loop
9270                         if No (Ent) then
9271                            Error_Pragma
9272                              ("pragma % entity name does not match any " &
9273                               "enumeration literal");
9274
9275                         elsif Chars (Ent) = Chars (Ename) then
9276                            Set_Entity (Ename, Ent);
9277                            Generate_Reference (Ent, Ename);
9278                            exit;
9279
9280                         else
9281                            Ent := Next_Literal (Ent);
9282                         end if;
9283                      end loop;
9284                   end if;
9285                end if;
9286
9287                --  Ent points to entity to be marked
9288
9289                if Arg_Count >= 1 then
9290
9291                   --  Deal with static string argument
9292
9293                   Check_Arg_Is_Static_Expression (Arg1, Standard_String);
9294                   S := Strval (Expression (Arg1));
9295
9296                   for J in 1 .. String_Length (S) loop
9297                      if not In_Character_Range (Get_String_Char (S, J)) then
9298                         Error_Pragma_Arg
9299                           ("pragma% argument does not allow wide characters",
9300                            Arg1);
9301                      end if;
9302                   end loop;
9303
9304                   Obsolescent_Warnings.Append
9305                     ((Ent => Ent, Msg => Strval (Expression (Arg1))));
9306
9307                   --  Check for Ada_05 parameter
9308
9309                   if Arg_Count /= 1 then
9310                      Check_Arg_Count (2);
9311
9312                      declare
9313                         Argx : constant Node_Id := Get_Pragma_Arg (Arg2);
9314
9315                      begin
9316                         Check_Arg_Is_Identifier (Argx);
9317
9318                         if Chars (Argx) /= Name_Ada_05 then
9319                            Error_Msg_Name_2 := Name_Ada_05;
9320                            Error_Pragma_Arg
9321                              ("only allowed argument for pragma% is %", Argx);
9322                         end if;
9323
9324                         if Ada_Version_Explicit < Ada_05
9325                           or else not Warn_On_Ada_2005_Compatibility
9326                         then
9327                            Active := False;
9328                         end if;
9329                      end;
9330                   end if;
9331                end if;
9332
9333                --  Set flag if pragma active
9334
9335                if Active then
9336                   Set_Is_Obsolescent (Ent);
9337                end if;
9338
9339                return;
9340             end Set_Obsolescent;
9341
9342          --  Start of processing for pragma Obsolescent
9343
9344          begin
9345             GNAT_Pragma;
9346
9347             Check_At_Most_N_Arguments (3);
9348
9349             --  See if first argument specifies an entity name
9350
9351             if Arg_Count >= 1
9352               and then
9353                 (Chars (Arg1) = Name_Entity
9354                    or else
9355                      Nkind_In (Get_Pragma_Arg (Arg1), N_Character_Literal,
9356                                                       N_Identifier,
9357                                                       N_Operator_Symbol))
9358             then
9359                Ename := Get_Pragma_Arg (Arg1);
9360
9361                --  Eliminate first argument, so we can share processing
9362
9363                Arg1 := Arg2;
9364                Arg2 := Arg3;
9365                Arg_Count := Arg_Count - 1;
9366
9367             --  No Entity name argument given
9368
9369             else
9370                Ename := Empty;
9371             end if;
9372
9373             if Arg_Count >= 1 then
9374                Check_Optional_Identifier (Arg1, Name_Message);
9375
9376                if Arg_Count = 2 then
9377                   Check_Optional_Identifier (Arg2, Name_Version);
9378                end if;
9379             end if;
9380
9381             --  Get immediately preceding declaration
9382
9383             Decl := Prev (N);
9384             while Present (Decl) and then Nkind (Decl) = N_Pragma loop
9385                Prev (Decl);
9386             end loop;
9387
9388             --  Cases where we do not follow anything other than another pragma
9389
9390             if No (Decl) then
9391
9392                --  First case: library level compilation unit declaration with
9393                --  the pragma immediately following the declaration.
9394
9395                if Nkind (Parent (N)) = N_Compilation_Unit_Aux then
9396                   Set_Obsolescent
9397                     (Defining_Entity (Unit (Parent (Parent (N)))));
9398                   return;
9399
9400                --  Case 2: library unit placement for package
9401
9402                else
9403                   declare
9404                      Ent : constant Entity_Id := Find_Lib_Unit_Name;
9405                   begin
9406                      if Is_Package_Or_Generic_Package (Ent) then
9407                         Set_Obsolescent (Ent);
9408                         return;
9409                      end if;
9410                   end;
9411                end if;
9412
9413             --  Cases where we must follow a declaration
9414
9415             else
9416                if         Nkind (Decl) not in N_Declaration
9417                  and then Nkind (Decl) not in N_Later_Decl_Item
9418                  and then Nkind (Decl) not in N_Generic_Declaration
9419                  and then Nkind (Decl) not in N_Renaming_Declaration
9420                then
9421                   Error_Pragma
9422                     ("pragma% misplaced, "
9423                      & "must immediately follow a declaration");
9424
9425                else
9426                   Set_Obsolescent (Defining_Entity (Decl));
9427                   return;
9428                end if;
9429             end if;
9430          end Obsolescent;
9431
9432          --------------
9433          -- Optimize --
9434          --------------
9435
9436          --  pragma Optimize (Time | Space | Off);
9437
9438          --  The actual check for optimize is done in Gigi. Note that this
9439          --  pragma does not actually change the optimization setting, it
9440          --  simply checks that it is consistent with the pragma.
9441
9442          when Pragma_Optimize =>
9443             Check_No_Identifiers;
9444             Check_Arg_Count (1);
9445             Check_Arg_Is_One_Of (Arg1, Name_Time, Name_Space, Name_Off);
9446
9447          ------------------------
9448          -- Optimize_Alignment --
9449          ------------------------
9450
9451          --  pragma Optimize_Alignment (Time | Space | Off);
9452
9453          when Pragma_Optimize_Alignment =>
9454             GNAT_Pragma;
9455             Check_No_Identifiers;
9456             Check_Arg_Count (1);
9457             Check_Valid_Configuration_Pragma;
9458
9459             declare
9460                Nam : constant Name_Id := Chars (Get_Pragma_Arg (Arg1));
9461             begin
9462                case Nam is
9463                   when Name_Time =>
9464                      Opt.Optimize_Alignment := 'T';
9465                   when Name_Space =>
9466                      Opt.Optimize_Alignment := 'S';
9467                   when Name_Off =>
9468                      Opt.Optimize_Alignment := 'O';
9469                   when others =>
9470                      Error_Pragma_Arg ("invalid argument for pragma%", Arg1);
9471                end case;
9472             end;
9473
9474             --  Set indication that mode is set locally. If we are in fact in a
9475             --  configuration pragma file, this setting is harmless since the
9476             --  switch will get reset anyway at the start of each unit.
9477
9478             Optimize_Alignment_Local := True;
9479
9480          ----------
9481          -- Pack --
9482          ----------
9483
9484          --  pragma Pack (first_subtype_LOCAL_NAME);
9485
9486          when Pragma_Pack => Pack : declare
9487             Assoc   : constant Node_Id := Arg1;
9488             Type_Id : Node_Id;
9489             Typ     : Entity_Id;
9490
9491          begin
9492             Check_No_Identifiers;
9493             Check_Arg_Count (1);
9494             Check_Arg_Is_Local_Name (Arg1);
9495
9496             Type_Id := Expression (Assoc);
9497             Find_Type (Type_Id);
9498             Typ := Entity (Type_Id);
9499
9500             if Typ = Any_Type
9501               or else Rep_Item_Too_Early (Typ, N)
9502             then
9503                return;
9504             else
9505                Typ := Underlying_Type (Typ);
9506             end if;
9507
9508             if not Is_Array_Type (Typ) and then not Is_Record_Type (Typ) then
9509                Error_Pragma ("pragma% must specify array or record type");
9510             end if;
9511
9512             Check_First_Subtype (Arg1);
9513
9514             if Has_Pragma_Pack (Typ) then
9515                Error_Pragma ("duplicate pragma%, only one allowed");
9516
9517             --  Array type
9518
9519             elsif Is_Array_Type (Typ) then
9520
9521                --  Pack not allowed for aliased or atomic components
9522
9523                if Has_Aliased_Components (Base_Type (Typ)) then
9524                   Error_Pragma
9525                     ("pragma% ignored, cannot pack aliased components?");
9526
9527                elsif Has_Atomic_Components (Typ)
9528                  or else Is_Atomic (Component_Type (Typ))
9529                then
9530                   Error_Pragma
9531                     ("?pragma% ignored, cannot pack atomic components");
9532                end if;
9533
9534                --  If we had an explicit component size given, then we do not
9535                --  let Pack override this given size. We also give a warning
9536                --  that Pack is being ignored unless we can tell for sure that
9537                --  the Pack would not have had any effect anyway.
9538
9539                if Has_Component_Size_Clause (Typ) then
9540                   if Known_Static_RM_Size (Component_Type (Typ))
9541                     and then
9542                       RM_Size (Component_Type (Typ)) = Component_Size (Typ)
9543                   then
9544                      null;
9545                   else
9546                      Error_Pragma
9547                        ("?pragma% ignored, explicit component size given");
9548                   end if;
9549
9550                --  If no prior array component size given, Pack is effective
9551
9552                else
9553                   if not Rep_Item_Too_Late (Typ, N) then
9554
9555                      --  In the context of static code analysis, we do not need
9556                      --  complex front-end expansions related to pragma Pack,
9557                      --  so disable handling of pragma Pack in this case.
9558
9559                      if CodePeer_Mode then
9560                         null;
9561
9562                      --  For normal non-VM target, do the packing
9563
9564                      elsif VM_Target = No_VM then
9565                         Set_Is_Packed            (Base_Type (Typ));
9566                         Set_Has_Pragma_Pack      (Base_Type (Typ));
9567                            Set_Has_Non_Standard_Rep (Base_Type (Typ));
9568
9569                      --  If we ignore the pack, then warn about this, except
9570                      --  that we suppress the warning in GNAT mode.
9571
9572                      elsif not GNAT_Mode then
9573                         Error_Pragma
9574                           ("?pragma% ignored in this configuration");
9575                      end if;
9576                   end if;
9577                end if;
9578
9579             --  For record types, the pack is always effective
9580
9581             else pragma Assert (Is_Record_Type (Typ));
9582                if not Rep_Item_Too_Late (Typ, N) then
9583                   if VM_Target = No_VM then
9584                      Set_Is_Packed            (Base_Type (Typ));
9585                      Set_Has_Pragma_Pack      (Base_Type (Typ));
9586                      Set_Has_Non_Standard_Rep (Base_Type (Typ));
9587
9588                   elsif not GNAT_Mode then
9589                      Error_Pragma ("?pragma% ignored in this configuration");
9590                   end if;
9591                end if;
9592             end if;
9593          end Pack;
9594
9595          ----------
9596          -- Page --
9597          ----------
9598
9599          --  pragma Page;
9600
9601          --  There is nothing to do here, since we did all the processing for
9602          --  this pragma in Par.Prag (so that it works properly even in syntax
9603          --  only mode).
9604
9605          when Pragma_Page =>
9606             null;
9607
9608          -------------
9609          -- Passive --
9610          -------------
9611
9612          --  pragma Passive [(PASSIVE_FORM)];
9613
9614          --   PASSIVE_FORM ::= Semaphore | No
9615
9616          when Pragma_Passive =>
9617             GNAT_Pragma;
9618
9619             if Nkind (Parent (N)) /= N_Task_Definition then
9620                Error_Pragma ("pragma% must be within task definition");
9621             end if;
9622
9623             if Arg_Count /= 0 then
9624                Check_Arg_Count (1);
9625                Check_Arg_Is_One_Of (Arg1, Name_Semaphore, Name_No);
9626             end if;
9627
9628          ----------------------------------
9629          -- Preelaborable_Initialization --
9630          ----------------------------------
9631
9632          --  pragma Preelaborable_Initialization (DIRECT_NAME);
9633
9634          when Pragma_Preelaborable_Initialization => Preelab_Init : declare
9635             Ent : Entity_Id;
9636
9637          begin
9638             Ada_2005_Pragma;
9639             Check_Arg_Count (1);
9640             Check_No_Identifiers;
9641             Check_Arg_Is_Identifier (Arg1);
9642             Check_Arg_Is_Local_Name (Arg1);
9643             Check_First_Subtype (Arg1);
9644             Ent := Entity (Expression (Arg1));
9645
9646             if not Is_Private_Type (Ent)
9647               and then not Is_Protected_Type (Ent)
9648             then
9649                Error_Pragma_Arg
9650                  ("pragma % can only be applied to private or protected type",
9651                   Arg1);
9652             end if;
9653
9654             --  Give an error if the pragma is applied to a protected type that
9655             --  does not qualify (due to having entries, or due to components
9656             --  that do not qualify).
9657
9658             if Is_Protected_Type (Ent)
9659               and then not Has_Preelaborable_Initialization (Ent)
9660             then
9661                Error_Msg_N
9662                  ("protected type & does not have preelaborable " &
9663                   "initialization", Ent);
9664
9665             --  Otherwise mark the type as definitely having preelaborable
9666             --  initialization.
9667
9668             else
9669                Set_Known_To_Have_Preelab_Init (Ent);
9670             end if;
9671
9672             if Has_Pragma_Preelab_Init (Ent)
9673               and then Warn_On_Redundant_Constructs
9674             then
9675                Error_Pragma ("?duplicate pragma%!");
9676             else
9677                Set_Has_Pragma_Preelab_Init (Ent);
9678             end if;
9679          end Preelab_Init;
9680
9681          --------------------
9682          -- Persistent_BSS --
9683          --------------------
9684
9685          when Pragma_Persistent_BSS => Persistent_BSS :  declare
9686             Decl : Node_Id;
9687             Ent  : Entity_Id;
9688             Prag : Node_Id;
9689
9690          begin
9691             GNAT_Pragma;
9692             Check_At_Most_N_Arguments (1);
9693
9694             --  Case of application to specific object (one argument)
9695
9696             if Arg_Count = 1 then
9697                Check_Arg_Is_Library_Level_Local_Name (Arg1);
9698
9699                if not Is_Entity_Name (Expression (Arg1))
9700                  or else
9701                   (Ekind (Entity (Expression (Arg1))) /= E_Variable
9702                     and then Ekind (Entity (Expression (Arg1))) /= E_Constant)
9703                then
9704                   Error_Pragma_Arg ("pragma% only applies to objects", Arg1);
9705                end if;
9706
9707                Ent := Entity (Expression (Arg1));
9708                Decl := Parent (Ent);
9709
9710                if Rep_Item_Too_Late (Ent, N) then
9711                   return;
9712                end if;
9713
9714                if Present (Expression (Decl)) then
9715                   Error_Pragma_Arg
9716                     ("object for pragma% cannot have initialization", Arg1);
9717                end if;
9718
9719                if not Is_Potentially_Persistent_Type (Etype (Ent)) then
9720                   Error_Pragma_Arg
9721                     ("object type for pragma% is not potentially persistent",
9722                      Arg1);
9723                end if;
9724
9725                Prag :=
9726                  Make_Linker_Section_Pragma
9727                    (Ent, Sloc (N), ".persistent.bss");
9728                Insert_After (N, Prag);
9729                Analyze (Prag);
9730
9731             --  Case of use as configuration pragma with no arguments
9732
9733             else
9734                Check_Valid_Configuration_Pragma;
9735                Persistent_BSS_Mode := True;
9736             end if;
9737          end Persistent_BSS;
9738
9739          -------------
9740          -- Polling --
9741          -------------
9742
9743          --  pragma Polling (ON | OFF);
9744
9745          when Pragma_Polling =>
9746             GNAT_Pragma;
9747             Check_Arg_Count (1);
9748             Check_No_Identifiers;
9749             Check_Arg_Is_One_Of (Arg1, Name_On, Name_Off);
9750             Polling_Required := (Chars (Expression (Arg1)) = Name_On);
9751
9752          -------------------
9753          -- Postcondition --
9754          -------------------
9755
9756          --  pragma Postcondition ([Check   =>] Boolean_Expression
9757          --                      [,[Message =>] String_Expression]);
9758
9759          when Pragma_Postcondition => Postcondition : declare
9760             In_Body : Boolean;
9761             pragma Warnings (Off, In_Body);
9762
9763          begin
9764             GNAT_Pragma;
9765             Check_At_Least_N_Arguments (1);
9766             Check_At_Most_N_Arguments (2);
9767             Check_Optional_Identifier (Arg1, Name_Check);
9768
9769             --  All we need to do here is call the common check procedure,
9770             --  the remainder of the processing is found in Sem_Ch6/Sem_Ch7.
9771
9772             Check_Precondition_Postcondition (In_Body);
9773          end Postcondition;
9774
9775          ------------------
9776          -- Precondition --
9777          ------------------
9778
9779          --  pragma Precondition ([Check   =>] Boolean_Expression
9780          --                     [,[Message =>] String_Expression]);
9781
9782          when Pragma_Precondition => Precondition : declare
9783             In_Body : Boolean;
9784
9785          begin
9786             GNAT_Pragma;
9787             Check_At_Least_N_Arguments (1);
9788             Check_At_Most_N_Arguments (2);
9789             Check_Optional_Identifier (Arg1, Name_Check);
9790
9791             Check_Precondition_Postcondition (In_Body);
9792
9793             --  If in spec, nothing more to do. If in body, then we convert the
9794             --  pragma to pragma Check (Precondition, cond [, msg]). Note we do
9795             --  this whether or not precondition checks are enabled. That works
9796             --  fine since pragma Check will do this check, and will also
9797             --  analyze the condition itself in the proper context.
9798
9799             if In_Body then
9800                if Arg_Count = 2 then
9801                   Check_Optional_Identifier (Arg3, Name_Message);
9802                   Analyze_And_Resolve (Get_Pragma_Arg (Arg2), Standard_String);
9803                end if;
9804
9805                Rewrite (N,
9806                  Make_Pragma (Loc,
9807                    Chars => Name_Check,
9808                    Pragma_Argument_Associations => New_List (
9809                      Make_Pragma_Argument_Association (Loc,
9810                        Expression =>
9811                          Make_Identifier (Loc,
9812                            Chars => Name_Precondition)),
9813
9814                      Make_Pragma_Argument_Association (Sloc (Arg1),
9815                        Expression => Relocate_Node (Get_Pragma_Arg (Arg1))))));
9816
9817                if Arg_Count = 2 then
9818                   Append_To (Pragma_Argument_Associations (N),
9819                     Make_Pragma_Argument_Association (Sloc (Arg2),
9820                       Expression => Relocate_Node (Get_Pragma_Arg (Arg2))));
9821                end if;
9822
9823                Analyze (N);
9824             end if;
9825          end Precondition;
9826
9827          ------------------
9828          -- Preelaborate --
9829          ------------------
9830
9831          --  pragma Preelaborate [(library_unit_NAME)];
9832
9833          --  Set the flag Is_Preelaborated of program unit name entity
9834
9835          when Pragma_Preelaborate => Preelaborate : declare
9836             Pa  : constant Node_Id   := Parent (N);
9837             Pk  : constant Node_Kind := Nkind (Pa);
9838             Ent : Entity_Id;
9839
9840          begin
9841             Check_Ada_83_Warning;
9842             Check_Valid_Library_Unit_Pragma;
9843
9844             if Nkind (N) = N_Null_Statement then
9845                return;
9846             end if;
9847
9848             Ent := Find_Lib_Unit_Name;
9849
9850             --  This filters out pragmas inside generic parent then
9851             --  show up inside instantiation
9852
9853             if Present (Ent)
9854               and then not (Pk = N_Package_Specification
9855                               and then Present (Generic_Parent (Pa)))
9856             then
9857                if not Debug_Flag_U then
9858                   Set_Is_Preelaborated (Ent);
9859                   Set_Suppress_Elaboration_Warnings (Ent);
9860                end if;
9861             end if;
9862          end Preelaborate;
9863
9864          ---------------------
9865          -- Preelaborate_05 --
9866          ---------------------
9867
9868          --  pragma Preelaborate_05 [(library_unit_NAME)];
9869
9870          --  This pragma is useable only in GNAT_Mode, where it is used like
9871          --  pragma Preelaborate but it is only effective in Ada 2005 mode
9872          --  (otherwise it is ignored). This is used to implement AI-362 which
9873          --  recategorizes some run-time packages in Ada 2005 mode.
9874
9875          when Pragma_Preelaborate_05 => Preelaborate_05 : declare
9876             Ent : Entity_Id;
9877
9878          begin
9879             GNAT_Pragma;
9880             Check_Valid_Library_Unit_Pragma;
9881
9882             if not GNAT_Mode then
9883                Error_Pragma ("pragma% only available in GNAT mode");
9884             end if;
9885
9886             if Nkind (N) = N_Null_Statement then
9887                return;
9888             end if;
9889
9890             --  This is one of the few cases where we need to test the value of
9891             --  Ada_Version_Explicit rather than Ada_Version (which is always
9892             --  set to Ada_05 in a predefined unit), we need to know the
9893             --  explicit version set to know if this pragma is active.
9894
9895             if Ada_Version_Explicit >= Ada_05 then
9896                Ent := Find_Lib_Unit_Name;
9897                Set_Is_Preelaborated (Ent);
9898                Set_Suppress_Elaboration_Warnings (Ent);
9899             end if;
9900          end Preelaborate_05;
9901
9902          --------------
9903          -- Priority --
9904          --------------
9905
9906          --  pragma Priority (EXPRESSION);
9907
9908          when Pragma_Priority => Priority : declare
9909             P   : constant Node_Id := Parent (N);
9910             Arg : Node_Id;
9911
9912          begin
9913             Check_No_Identifiers;
9914             Check_Arg_Count (1);
9915
9916             --  Subprogram case
9917
9918             if Nkind (P) = N_Subprogram_Body then
9919                Check_In_Main_Program;
9920
9921                Arg := Expression (Arg1);
9922                Analyze_And_Resolve (Arg, Standard_Integer);
9923
9924                --  Must be static
9925
9926                if not Is_Static_Expression (Arg) then
9927                   Flag_Non_Static_Expr
9928                     ("main subprogram priority is not static!", Arg);
9929                   raise Pragma_Exit;
9930
9931                --  If constraint error, then we already signalled an error
9932
9933                elsif Raises_Constraint_Error (Arg) then
9934                   null;
9935
9936                --  Otherwise check in range
9937
9938                else
9939                   declare
9940                      Val : constant Uint := Expr_Value (Arg);
9941
9942                   begin
9943                      if Val < 0
9944                        or else Val > Expr_Value (Expression
9945                                        (Parent (RTE (RE_Max_Priority))))
9946                      then
9947                         Error_Pragma_Arg
9948                           ("main subprogram priority is out of range", Arg1);
9949                      end if;
9950                   end;
9951                end if;
9952
9953                Set_Main_Priority
9954                     (Current_Sem_Unit, UI_To_Int (Expr_Value (Arg)));
9955
9956                --  Load an arbitrary entity from System.Tasking to make sure
9957                --  this package is implicitly with'ed, since we need to have
9958                --  the tasking run-time active for the pragma Priority to have
9959                --  any effect.
9960
9961                declare
9962                   Discard : Entity_Id;
9963                   pragma Warnings (Off, Discard);
9964                begin
9965                   Discard := RTE (RE_Task_List);
9966                end;
9967
9968             --  Task or Protected, must be of type Integer
9969
9970             elsif Nkind_In (P, N_Protected_Definition, N_Task_Definition) then
9971                Arg := Expression (Arg1);
9972
9973                --  The expression must be analyzed in the special manner
9974                --  described in "Handling of Default and Per-Object
9975                --  Expressions" in sem.ads.
9976
9977                Preanalyze_Spec_Expression (Arg, Standard_Integer);
9978
9979                if not Is_Static_Expression (Arg) then
9980                   Check_Restriction (Static_Priorities, Arg);
9981                end if;
9982
9983             --  Anything else is incorrect
9984
9985             else
9986                Pragma_Misplaced;
9987             end if;
9988
9989             if Has_Priority_Pragma (P) then
9990                Error_Pragma ("duplicate pragma% not allowed");
9991             else
9992                Set_Has_Priority_Pragma (P, True);
9993
9994                if Nkind_In (P, N_Protected_Definition, N_Task_Definition) then
9995                   Record_Rep_Item (Defining_Identifier (Parent (P)), N);
9996                   --  exp_ch9 should use this ???
9997                end if;
9998             end if;
9999          end Priority;
10000
10001          -----------------------------------
10002          -- Priority_Specific_Dispatching --
10003          -----------------------------------
10004
10005          --  pragma Priority_Specific_Dispatching (
10006          --    policy_IDENTIFIER,
10007          --    first_priority_EXPRESSION,
10008          --    last_priority_EXPRESSION);
10009
10010          when Pragma_Priority_Specific_Dispatching =>
10011          Priority_Specific_Dispatching : declare
10012             Prio_Id : constant Entity_Id := RTE (RE_Any_Priority);
10013             --  This is the entity System.Any_Priority;
10014
10015             DP          : Character;
10016             Lower_Bound : Node_Id;
10017             Upper_Bound : Node_Id;
10018             Lower_Val   : Uint;
10019             Upper_Val   : Uint;
10020
10021          begin
10022             Ada_2005_Pragma;
10023             Check_Arg_Count (3);
10024             Check_No_Identifiers;
10025             Check_Arg_Is_Task_Dispatching_Policy (Arg1);
10026             Check_Valid_Configuration_Pragma;
10027             Get_Name_String (Chars (Expression (Arg1)));
10028             DP := Fold_Upper (Name_Buffer (1));
10029
10030             Lower_Bound := Expression (Arg2);
10031             Check_Arg_Is_Static_Expression (Lower_Bound, Standard_Integer);
10032             Lower_Val := Expr_Value (Lower_Bound);
10033
10034             Upper_Bound := Expression (Arg3);
10035             Check_Arg_Is_Static_Expression (Upper_Bound, Standard_Integer);
10036             Upper_Val := Expr_Value (Upper_Bound);
10037
10038             --  It is not allowed to use Task_Dispatching_Policy and
10039             --  Priority_Specific_Dispatching in the same partition.
10040
10041             if Task_Dispatching_Policy /= ' ' then
10042                Error_Msg_Sloc := Task_Dispatching_Policy_Sloc;
10043                Error_Pragma
10044                  ("pragma% incompatible with Task_Dispatching_Policy#");
10045
10046             --  Check lower bound in range
10047
10048             elsif Lower_Val < Expr_Value (Type_Low_Bound (Prio_Id))
10049                     or else
10050                   Lower_Val > Expr_Value (Type_High_Bound (Prio_Id))
10051             then
10052                Error_Pragma_Arg
10053                  ("first_priority is out of range", Arg2);
10054
10055             --  Check upper bound in range
10056
10057             elsif Upper_Val < Expr_Value (Type_Low_Bound (Prio_Id))
10058                     or else
10059                   Upper_Val > Expr_Value (Type_High_Bound (Prio_Id))
10060             then
10061                Error_Pragma_Arg
10062                  ("last_priority is out of range", Arg3);
10063
10064             --  Check that the priority range is valid
10065
10066             elsif Lower_Val > Upper_Val then
10067                Error_Pragma
10068                  ("last_priority_expression must be greater than" &
10069                   " or equal to first_priority_expression");
10070
10071             --  Store the new policy, but always preserve System_Location since
10072             --  we like the error message with the run-time name.
10073
10074             else
10075                --  Check overlapping in the priority ranges specified in other
10076                --  Priority_Specific_Dispatching pragmas within the same
10077                --  partition. We can only check those we know about!
10078
10079                for J in
10080                   Specific_Dispatching.First .. Specific_Dispatching.Last
10081                loop
10082                   if Specific_Dispatching.Table (J).First_Priority in
10083                     UI_To_Int (Lower_Val) .. UI_To_Int (Upper_Val)
10084                   or else Specific_Dispatching.Table (J).Last_Priority in
10085                     UI_To_Int (Lower_Val) .. UI_To_Int (Upper_Val)
10086                   then
10087                      Error_Msg_Sloc :=
10088                        Specific_Dispatching.Table (J).Pragma_Loc;
10089                         Error_Pragma
10090                           ("priority range overlaps with "
10091                            & "Priority_Specific_Dispatching#");
10092                   end if;
10093                end loop;
10094
10095                --  The use of Priority_Specific_Dispatching is incompatible
10096                --  with Task_Dispatching_Policy.
10097
10098                if Task_Dispatching_Policy /= ' ' then
10099                   Error_Msg_Sloc := Task_Dispatching_Policy_Sloc;
10100                      Error_Pragma
10101                        ("Priority_Specific_Dispatching incompatible "
10102                         & "with Task_Dispatching_Policy#");
10103                end if;
10104
10105                --  The use of Priority_Specific_Dispatching forces ceiling
10106                --  locking policy.
10107
10108                if Locking_Policy /= ' ' and then Locking_Policy /= 'C' then
10109                   Error_Msg_Sloc := Locking_Policy_Sloc;
10110                      Error_Pragma
10111                        ("Priority_Specific_Dispatching incompatible "
10112                         & "with Locking_Policy#");
10113
10114                --  Set the Ceiling_Locking policy, but preserve System_Location
10115                --  since we like the error message with the run time name.
10116
10117                else
10118                   Locking_Policy := 'C';
10119
10120                   if Locking_Policy_Sloc /= System_Location then
10121                      Locking_Policy_Sloc := Loc;
10122                   end if;
10123                end if;
10124
10125                --  Add entry in the table
10126
10127                Specific_Dispatching.Append
10128                     ((Dispatching_Policy => DP,
10129                       First_Priority     => UI_To_Int (Lower_Val),
10130                       Last_Priority      => UI_To_Int (Upper_Val),
10131                       Pragma_Loc         => Loc));
10132             end if;
10133          end Priority_Specific_Dispatching;
10134
10135          -------------
10136          -- Profile --
10137          -------------
10138
10139          --  pragma Profile (profile_IDENTIFIER);
10140
10141          --  profile_IDENTIFIER => Restricted | Ravenscar
10142
10143          when Pragma_Profile =>
10144             Ada_2005_Pragma;
10145             Check_Arg_Count (1);
10146             Check_Valid_Configuration_Pragma;
10147             Check_No_Identifiers;
10148
10149             declare
10150                Argx : constant Node_Id := Get_Pragma_Arg (Arg1);
10151             begin
10152                if Chars (Argx) = Name_Ravenscar then
10153                   Set_Ravenscar_Profile (N);
10154                elsif Chars (Argx) = Name_Restricted then
10155                   Set_Profile_Restrictions
10156                     (Restricted, N, Warn => Treat_Restrictions_As_Warnings);
10157                else
10158                   Error_Pragma_Arg ("& is not a valid profile", Argx);
10159                end if;
10160             end;
10161
10162          ----------------------
10163          -- Profile_Warnings --
10164          ----------------------
10165
10166          --  pragma Profile_Warnings (profile_IDENTIFIER);
10167
10168          --  profile_IDENTIFIER => Restricted | Ravenscar
10169
10170          when Pragma_Profile_Warnings =>
10171             GNAT_Pragma;
10172             Check_Arg_Count (1);
10173             Check_Valid_Configuration_Pragma;
10174             Check_No_Identifiers;
10175
10176             declare
10177                Argx : constant Node_Id := Get_Pragma_Arg (Arg1);
10178             begin
10179                if Chars (Argx) = Name_Ravenscar then
10180                   Set_Profile_Restrictions (Ravenscar, N, Warn => True);
10181                elsif Chars (Argx) = Name_Restricted then
10182                   Set_Profile_Restrictions (Restricted, N, Warn => True);
10183                else
10184                   Error_Pragma_Arg ("& is not a valid profile", Argx);
10185                end if;
10186             end;
10187
10188          --------------------------
10189          -- Propagate_Exceptions --
10190          --------------------------
10191
10192          --  pragma Propagate_Exceptions;
10193
10194          --  Note: this pragma is obsolete and has no effect
10195
10196          when Pragma_Propagate_Exceptions =>
10197             GNAT_Pragma;
10198             Check_Arg_Count (0);
10199
10200             if In_Extended_Main_Source_Unit (N) then
10201                Propagate_Exceptions := True;
10202             end if;
10203
10204          ------------------
10205          -- Psect_Object --
10206          ------------------
10207
10208          --  pragma Psect_Object (
10209          --        [Internal =>] LOCAL_NAME,
10210          --     [, [External =>] EXTERNAL_SYMBOL]
10211          --     [, [Size     =>] EXTERNAL_SYMBOL]);
10212
10213          when Pragma_Psect_Object | Pragma_Common_Object =>
10214          Psect_Object : declare
10215             Args  : Args_List (1 .. 3);
10216             Names : constant Name_List (1 .. 3) := (
10217                       Name_Internal,
10218                       Name_External,
10219                       Name_Size);
10220
10221             Internal : Node_Id renames Args (1);
10222             External : Node_Id renames Args (2);
10223             Size     : Node_Id renames Args (3);
10224
10225             Def_Id : Entity_Id;
10226
10227             procedure Check_Too_Long (Arg : Node_Id);
10228             --  Posts message if the argument is an identifier with more
10229             --  than 31 characters, or a string literal with more than
10230             --  31 characters, and we are operating under VMS
10231
10232             --------------------
10233             -- Check_Too_Long --
10234             --------------------
10235
10236             procedure Check_Too_Long (Arg : Node_Id) is
10237                X : constant Node_Id := Original_Node (Arg);
10238
10239             begin
10240                if not Nkind_In (X, N_String_Literal, N_Identifier) then
10241                   Error_Pragma_Arg
10242                     ("inappropriate argument for pragma %", Arg);
10243                end if;
10244
10245                if OpenVMS_On_Target then
10246                   if (Nkind (X) = N_String_Literal
10247                        and then String_Length (Strval (X)) > 31)
10248                     or else
10249                      (Nkind (X) = N_Identifier
10250                        and then Length_Of_Name (Chars (X)) > 31)
10251                   then
10252                      Error_Pragma_Arg
10253                        ("argument for pragma % is longer than 31 characters",
10254                         Arg);
10255                   end if;
10256                end if;
10257             end Check_Too_Long;
10258
10259          --  Start of processing for Common_Object/Psect_Object
10260
10261          begin
10262             GNAT_Pragma;
10263             Gather_Associations (Names, Args);
10264             Process_Extended_Import_Export_Internal_Arg (Internal);
10265
10266             Def_Id := Entity (Internal);
10267
10268             if Ekind (Def_Id) /= E_Constant
10269               and then Ekind (Def_Id) /= E_Variable
10270             then
10271                Error_Pragma_Arg
10272                  ("pragma% must designate an object", Internal);
10273             end if;
10274
10275             Check_Too_Long (Internal);
10276
10277             if Is_Imported (Def_Id) or else Is_Exported (Def_Id) then
10278                Error_Pragma_Arg
10279                  ("cannot use pragma% for imported/exported object",
10280                   Internal);
10281             end if;
10282
10283             if Is_Concurrent_Type (Etype (Internal)) then
10284                Error_Pragma_Arg
10285                  ("cannot specify pragma % for task/protected object",
10286                   Internal);
10287             end if;
10288
10289             if Has_Rep_Pragma (Def_Id, Name_Common_Object)
10290                  or else
10291                Has_Rep_Pragma (Def_Id, Name_Psect_Object)
10292             then
10293                Error_Msg_N ("?duplicate Common/Psect_Object pragma", N);
10294             end if;
10295
10296             if Ekind (Def_Id) = E_Constant then
10297                Error_Pragma_Arg
10298                  ("cannot specify pragma % for a constant", Internal);
10299             end if;
10300
10301             if Is_Record_Type (Etype (Internal)) then
10302                declare
10303                   Ent  : Entity_Id;
10304                   Decl : Entity_Id;
10305
10306                begin
10307                   Ent := First_Entity (Etype (Internal));
10308                   while Present (Ent) loop
10309                      Decl := Declaration_Node (Ent);
10310
10311                      if Ekind (Ent) = E_Component
10312                        and then Nkind (Decl) = N_Component_Declaration
10313                        and then Present (Expression (Decl))
10314                        and then Warn_On_Export_Import
10315                      then
10316                         Error_Msg_N
10317                           ("?object for pragma % has defaults", Internal);
10318                         exit;
10319
10320                      else
10321                         Next_Entity (Ent);
10322                      end if;
10323                   end loop;
10324                end;
10325             end if;
10326
10327             if Present (Size) then
10328                Check_Too_Long (Size);
10329             end if;
10330
10331             if Present (External) then
10332                Check_Arg_Is_External_Name (External);
10333                Check_Too_Long (External);
10334             end if;
10335
10336             --  If all error tests pass, link pragma on to the rep item chain
10337
10338             Record_Rep_Item (Def_Id, N);
10339          end Psect_Object;
10340
10341          ----------
10342          -- Pure --
10343          ----------
10344
10345          --  pragma Pure [(library_unit_NAME)];
10346
10347          when Pragma_Pure => Pure : declare
10348             Ent : Entity_Id;
10349
10350          begin
10351             Check_Ada_83_Warning;
10352             Check_Valid_Library_Unit_Pragma;
10353
10354             if Nkind (N) = N_Null_Statement then
10355                return;
10356             end if;
10357
10358             Ent := Find_Lib_Unit_Name;
10359             Set_Is_Pure (Ent);
10360             Set_Has_Pragma_Pure (Ent);
10361             Set_Suppress_Elaboration_Warnings (Ent);
10362          end Pure;
10363
10364          -------------
10365          -- Pure_05 --
10366          -------------
10367
10368          --  pragma Pure_05 [(library_unit_NAME)];
10369
10370          --  This pragma is useable only in GNAT_Mode, where it is used like
10371          --  pragma Pure but it is only effective in Ada 2005 mode (otherwise
10372          --  it is ignored). It may be used after a pragma Preelaborate, in
10373          --  which case it overrides the effect of the pragma Preelaborate.
10374          --  This is used to implement AI-362 which recategorizes some run-time
10375          --  packages in Ada 2005 mode.
10376
10377          when Pragma_Pure_05 => Pure_05 : declare
10378             Ent : Entity_Id;
10379
10380          begin
10381             GNAT_Pragma;
10382             Check_Valid_Library_Unit_Pragma;
10383
10384             if not GNAT_Mode then
10385                Error_Pragma ("pragma% only available in GNAT mode");
10386             end if;
10387
10388             if Nkind (N) = N_Null_Statement then
10389                return;
10390             end if;
10391
10392             --  This is one of the few cases where we need to test the value of
10393             --  Ada_Version_Explicit rather than Ada_Version (which is always
10394             --  set to Ada_05 in a predefined unit), we need to know the
10395             --  explicit version set to know if this pragma is active.
10396
10397             if Ada_Version_Explicit >= Ada_05 then
10398                Ent := Find_Lib_Unit_Name;
10399                Set_Is_Preelaborated (Ent, False);
10400                Set_Is_Pure (Ent);
10401                Set_Suppress_Elaboration_Warnings (Ent);
10402             end if;
10403          end Pure_05;
10404
10405          -------------------
10406          -- Pure_Function --
10407          -------------------
10408
10409          --  pragma Pure_Function ([Entity =>] function_LOCAL_NAME);
10410
10411          when Pragma_Pure_Function => Pure_Function : declare
10412             E_Id      : Node_Id;
10413             E         : Entity_Id;
10414             Def_Id    : Entity_Id;
10415             Effective : Boolean := False;
10416
10417          begin
10418             GNAT_Pragma;
10419             Check_Arg_Count (1);
10420             Check_Optional_Identifier (Arg1, Name_Entity);
10421             Check_Arg_Is_Local_Name (Arg1);
10422             E_Id := Expression (Arg1);
10423
10424             if Error_Posted (E_Id) then
10425                return;
10426             end if;
10427
10428             --  Loop through homonyms (overloadings) of referenced entity
10429
10430             E := Entity (E_Id);
10431
10432             if Present (E) then
10433                loop
10434                   Def_Id := Get_Base_Subprogram (E);
10435
10436                   if Ekind (Def_Id) /= E_Function
10437                     and then Ekind (Def_Id) /= E_Generic_Function
10438                     and then Ekind (Def_Id) /= E_Operator
10439                   then
10440                      Error_Pragma_Arg
10441                        ("pragma% requires a function name", Arg1);
10442                   end if;
10443
10444                   Set_Is_Pure (Def_Id);
10445
10446                   if not Has_Pragma_Pure_Function (Def_Id) then
10447                      Set_Has_Pragma_Pure_Function (Def_Id);
10448                      Effective := True;
10449                   end if;
10450
10451                   E := Homonym (E);
10452                   exit when No (E) or else Scope (E) /= Current_Scope;
10453                end loop;
10454
10455                if not Effective
10456                  and then Warn_On_Redundant_Constructs
10457                then
10458                   Error_Msg_NE ("pragma Pure_Function on& is redundant?",
10459                     N, Entity (E_Id));
10460                end if;
10461             end if;
10462          end Pure_Function;
10463
10464          --------------------
10465          -- Queuing_Policy --
10466          --------------------
10467
10468          --  pragma Queuing_Policy (policy_IDENTIFIER);
10469
10470          when Pragma_Queuing_Policy => declare
10471             QP : Character;
10472
10473          begin
10474             Check_Ada_83_Warning;
10475             Check_Arg_Count (1);
10476             Check_No_Identifiers;
10477             Check_Arg_Is_Queuing_Policy (Arg1);
10478             Check_Valid_Configuration_Pragma;
10479             Get_Name_String (Chars (Expression (Arg1)));
10480             QP := Fold_Upper (Name_Buffer (1));
10481
10482             if Queuing_Policy /= ' '
10483               and then Queuing_Policy /= QP
10484             then
10485                Error_Msg_Sloc := Queuing_Policy_Sloc;
10486                Error_Pragma ("queuing policy incompatible with policy#");
10487
10488             --  Set new policy, but always preserve System_Location since we
10489             --  like the error message with the run time name.
10490
10491             else
10492                Queuing_Policy := QP;
10493
10494                if Queuing_Policy_Sloc /= System_Location then
10495                   Queuing_Policy_Sloc := Loc;
10496                end if;
10497             end if;
10498          end;
10499
10500          -----------------------
10501          -- Relative_Deadline --
10502          -----------------------
10503
10504          --  pragma Relative_Deadline (time_span_EXPRESSION);
10505
10506          when Pragma_Relative_Deadline => Relative_Deadline : declare
10507             P   : constant Node_Id := Parent (N);
10508             Arg : Node_Id;
10509
10510          begin
10511             Ada_2005_Pragma;
10512             Check_No_Identifiers;
10513             Check_Arg_Count (1);
10514
10515             Arg := Expression (Arg1);
10516
10517             --  The expression must be analyzed in the special manner described
10518             --  in "Handling of Default and Per-Object Expressions" in sem.ads.
10519
10520             Preanalyze_Spec_Expression (Arg, RTE (RE_Time_Span));
10521
10522             --  Subprogram case
10523
10524             if Nkind (P) = N_Subprogram_Body then
10525                Check_In_Main_Program;
10526
10527             --  Tasks
10528
10529             elsif Nkind (P) = N_Task_Definition then
10530                null;
10531
10532             --  Anything else is incorrect
10533
10534             else
10535                Pragma_Misplaced;
10536             end if;
10537
10538             if Has_Relative_Deadline_Pragma (P) then
10539                Error_Pragma ("duplicate pragma% not allowed");
10540             else
10541                Set_Has_Relative_Deadline_Pragma (P, True);
10542
10543                if Nkind (P) = N_Task_Definition then
10544                   Record_Rep_Item (Defining_Identifier (Parent (P)), N);
10545                end if;
10546             end if;
10547          end Relative_Deadline;
10548
10549          ---------------------------
10550          -- Remote_Call_Interface --
10551          ---------------------------
10552
10553          --  pragma Remote_Call_Interface [(library_unit_NAME)];
10554
10555          when Pragma_Remote_Call_Interface => Remote_Call_Interface : declare
10556             Cunit_Node : Node_Id;
10557             Cunit_Ent  : Entity_Id;
10558             K          : Node_Kind;
10559
10560          begin
10561             Check_Ada_83_Warning;
10562             Check_Valid_Library_Unit_Pragma;
10563
10564             if Nkind (N) = N_Null_Statement then
10565                return;
10566             end if;
10567
10568             Cunit_Node := Cunit (Current_Sem_Unit);
10569             K          := Nkind (Unit (Cunit_Node));
10570             Cunit_Ent  := Cunit_Entity (Current_Sem_Unit);
10571
10572             if K = N_Package_Declaration
10573               or else K = N_Generic_Package_Declaration
10574               or else K = N_Subprogram_Declaration
10575               or else K = N_Generic_Subprogram_Declaration
10576               or else (K = N_Subprogram_Body
10577                          and then Acts_As_Spec (Unit (Cunit_Node)))
10578             then
10579                null;
10580             else
10581                Error_Pragma (
10582                  "pragma% must apply to package or subprogram declaration");
10583             end if;
10584
10585             Set_Is_Remote_Call_Interface (Cunit_Ent);
10586          end Remote_Call_Interface;
10587
10588          ------------------
10589          -- Remote_Types --
10590          ------------------
10591
10592          --  pragma Remote_Types [(library_unit_NAME)];
10593
10594          when Pragma_Remote_Types => Remote_Types : declare
10595             Cunit_Node : Node_Id;
10596             Cunit_Ent  : Entity_Id;
10597
10598          begin
10599             Check_Ada_83_Warning;
10600             Check_Valid_Library_Unit_Pragma;
10601
10602             if Nkind (N) = N_Null_Statement then
10603                return;
10604             end if;
10605
10606             Cunit_Node := Cunit (Current_Sem_Unit);
10607             Cunit_Ent  := Cunit_Entity (Current_Sem_Unit);
10608
10609             if not Nkind_In (Unit (Cunit_Node), N_Package_Declaration,
10610                                                 N_Generic_Package_Declaration)
10611             then
10612                Error_Pragma
10613                  ("pragma% can only apply to a package declaration");
10614             end if;
10615
10616             Set_Is_Remote_Types (Cunit_Ent);
10617          end Remote_Types;
10618
10619          ---------------
10620          -- Ravenscar --
10621          ---------------
10622
10623          --  pragma Ravenscar;
10624
10625          when Pragma_Ravenscar =>
10626             GNAT_Pragma;
10627             Check_Arg_Count (0);
10628             Check_Valid_Configuration_Pragma;
10629             Set_Ravenscar_Profile (N);
10630
10631             if Warn_On_Obsolescent_Feature then
10632                Error_Msg_N
10633                  ("pragma Ravenscar is an obsolescent feature?", N);
10634                Error_Msg_N
10635                  ("|use pragma Profile (Ravenscar) instead", N);
10636             end if;
10637
10638          -------------------------
10639          -- Restricted_Run_Time --
10640          -------------------------
10641
10642          --  pragma Restricted_Run_Time;
10643
10644          when Pragma_Restricted_Run_Time =>
10645             GNAT_Pragma;
10646             Check_Arg_Count (0);
10647             Check_Valid_Configuration_Pragma;
10648             Set_Profile_Restrictions
10649               (Restricted, N, Warn => Treat_Restrictions_As_Warnings);
10650
10651             if Warn_On_Obsolescent_Feature then
10652                Error_Msg_N
10653                  ("pragma Restricted_Run_Time is an obsolescent feature?", N);
10654                Error_Msg_N
10655                  ("|use pragma Profile (Restricted) instead", N);
10656             end if;
10657
10658          ------------------
10659          -- Restrictions --
10660          ------------------
10661
10662          --  pragma Restrictions (RESTRICTION {, RESTRICTION});
10663
10664          --  RESTRICTION ::=
10665          --    restriction_IDENTIFIER
10666          --  | restriction_parameter_IDENTIFIER => EXPRESSION
10667
10668          when Pragma_Restrictions =>
10669             Process_Restrictions_Or_Restriction_Warnings
10670               (Warn => Treat_Restrictions_As_Warnings);
10671
10672          --------------------------
10673          -- Restriction_Warnings --
10674          --------------------------
10675
10676          --  pragma Restriction_Warnings (RESTRICTION {, RESTRICTION});
10677
10678          --  RESTRICTION ::=
10679          --    restriction_IDENTIFIER
10680          --  | restriction_parameter_IDENTIFIER => EXPRESSION
10681
10682          when Pragma_Restriction_Warnings =>
10683             GNAT_Pragma;
10684             Process_Restrictions_Or_Restriction_Warnings (Warn => True);
10685
10686          ----------------
10687          -- Reviewable --
10688          ----------------
10689
10690          --  pragma Reviewable;
10691
10692          when Pragma_Reviewable =>
10693             Check_Ada_83_Warning;
10694             Check_Arg_Count (0);
10695
10696             --  Call dummy debugging function rv. This is done to assist front
10697             --  end debugging. By placing a Reviewable pragma in the source
10698             --  program, a breakpoint on rv catches this place in the source,
10699             --  allowing convenient stepping to the point of interest.
10700
10701             rv;
10702
10703          --------------------------
10704          -- Short_Circuit_And_Or --
10705          --------------------------
10706
10707          when Pragma_Short_Circuit_And_Or =>
10708             GNAT_Pragma;
10709             Check_Arg_Count (0);
10710             Check_Valid_Configuration_Pragma;
10711             Short_Circuit_And_Or := True;
10712
10713          -------------------
10714          -- Share_Generic --
10715          -------------------
10716
10717          --  pragma Share_Generic (NAME {, NAME});
10718
10719          when Pragma_Share_Generic =>
10720             GNAT_Pragma;
10721             Process_Generic_List;
10722
10723          ------------
10724          -- Shared --
10725          ------------
10726
10727          --  pragma Shared (LOCAL_NAME);
10728
10729          when Pragma_Shared =>
10730             GNAT_Pragma;
10731             Process_Atomic_Shared_Volatile;
10732
10733          --------------------
10734          -- Shared_Passive --
10735          --------------------
10736
10737          --  pragma Shared_Passive [(library_unit_NAME)];
10738
10739          --  Set the flag Is_Shared_Passive of program unit name entity
10740
10741          when Pragma_Shared_Passive => Shared_Passive : declare
10742             Cunit_Node : Node_Id;
10743             Cunit_Ent  : Entity_Id;
10744
10745          begin
10746             Check_Ada_83_Warning;
10747             Check_Valid_Library_Unit_Pragma;
10748
10749             if Nkind (N) = N_Null_Statement then
10750                return;
10751             end if;
10752
10753             Cunit_Node := Cunit (Current_Sem_Unit);
10754             Cunit_Ent  := Cunit_Entity (Current_Sem_Unit);
10755
10756             if not Nkind_In (Unit (Cunit_Node), N_Package_Declaration,
10757                                                 N_Generic_Package_Declaration)
10758             then
10759                Error_Pragma
10760                  ("pragma% can only apply to a package declaration");
10761             end if;
10762
10763             Set_Is_Shared_Passive (Cunit_Ent);
10764          end Shared_Passive;
10765
10766          ----------------------
10767          -- Source_File_Name --
10768          ----------------------
10769
10770          --  There are five forms for this pragma:
10771
10772          --  pragma Source_File_Name (
10773          --    [UNIT_NAME      =>] unit_NAME,
10774          --     BODY_FILE_NAME =>  STRING_LITERAL
10775          --    [, [INDEX =>] INTEGER_LITERAL]);
10776
10777          --  pragma Source_File_Name (
10778          --    [UNIT_NAME      =>] unit_NAME,
10779          --     SPEC_FILE_NAME =>  STRING_LITERAL
10780          --    [, [INDEX =>] INTEGER_LITERAL]);
10781
10782          --  pragma Source_File_Name (
10783          --     BODY_FILE_NAME  => STRING_LITERAL
10784          --  [, DOT_REPLACEMENT => STRING_LITERAL]
10785          --  [, CASING          => CASING_SPEC]);
10786
10787          --  pragma Source_File_Name (
10788          --     SPEC_FILE_NAME  => STRING_LITERAL
10789          --  [, DOT_REPLACEMENT => STRING_LITERAL]
10790          --  [, CASING          => CASING_SPEC]);
10791
10792          --  pragma Source_File_Name (
10793          --     SUBUNIT_FILE_NAME  => STRING_LITERAL
10794          --  [, DOT_REPLACEMENT    => STRING_LITERAL]
10795          --  [, CASING             => CASING_SPEC]);
10796
10797          --  CASING_SPEC ::= Uppercase | Lowercase | Mixedcase
10798
10799          --  Pragma Source_File_Name_Project (SFNP) is equivalent to pragma
10800          --  Source_File_Name (SFN), however their usage is exclusive: SFN can
10801          --  only be used when no project file is used, while SFNP can only be
10802          --  used when a project file is used.
10803
10804          --  No processing here. Processing was completed during parsing, since
10805          --  we need to have file names set as early as possible. Units are
10806          --  loaded well before semantic processing starts.
10807
10808          --  The only processing we defer to this point is the check for
10809          --  correct placement.
10810
10811          when Pragma_Source_File_Name =>
10812             GNAT_Pragma;
10813             Check_Valid_Configuration_Pragma;
10814
10815          ------------------------------
10816          -- Source_File_Name_Project --
10817          ------------------------------
10818
10819          --  See Source_File_Name for syntax
10820
10821          --  No processing here. Processing was completed during parsing, since
10822          --  we need to have file names set as early as possible. Units are
10823          --  loaded well before semantic processing starts.
10824
10825          --  The only processing we defer to this point is the check for
10826          --  correct placement.
10827
10828          when Pragma_Source_File_Name_Project =>
10829             GNAT_Pragma;
10830             Check_Valid_Configuration_Pragma;
10831
10832             --  Check that a pragma Source_File_Name_Project is used only in a
10833             --  configuration pragmas file.
10834
10835             --  Pragmas Source_File_Name_Project should only be generated by
10836             --  the Project Manager in configuration pragmas files.
10837
10838             --  This is really an ugly test. It seems to depend on some
10839             --  accidental and undocumented property. At the very least it
10840             --  needs to be documented, but it would be better to have a
10841             --  clean way of testing if we are in a configuration file???
10842
10843             if Present (Parent (N)) then
10844                Error_Pragma
10845                  ("pragma% can only appear in a configuration pragmas file");
10846             end if;
10847
10848          ----------------------
10849          -- Source_Reference --
10850          ----------------------
10851
10852          --  pragma Source_Reference (INTEGER_LITERAL [, STRING_LITERAL]);
10853
10854          --  Nothing to do, all processing completed in Par.Prag, since we need
10855          --  the information for possible parser messages that are output.
10856
10857          when Pragma_Source_Reference =>
10858             GNAT_Pragma;
10859
10860          --------------------------------
10861          -- Static_Elaboration_Desired --
10862          --------------------------------
10863
10864          --  pragma Static_Elaboration_Desired (DIRECT_NAME);
10865
10866          when Pragma_Static_Elaboration_Desired =>
10867             GNAT_Pragma;
10868             Check_At_Most_N_Arguments (1);
10869
10870             if Is_Compilation_Unit (Current_Scope)
10871               and then Ekind (Current_Scope) = E_Package
10872             then
10873                Set_Static_Elaboration_Desired (Current_Scope, True);
10874             else
10875                Error_Pragma ("pragma% must apply to a library-level package");
10876             end if;
10877
10878          ------------------
10879          -- Storage_Size --
10880          ------------------
10881
10882          --  pragma Storage_Size (EXPRESSION);
10883
10884          when Pragma_Storage_Size => Storage_Size : declare
10885             P   : constant Node_Id := Parent (N);
10886             Arg : Node_Id;
10887
10888          begin
10889             Check_No_Identifiers;
10890             Check_Arg_Count (1);
10891
10892             --  The expression must be analyzed in the special manner described
10893             --  in "Handling of Default Expressions" in sem.ads.
10894
10895             Arg := Expression (Arg1);
10896             Preanalyze_Spec_Expression (Arg, Any_Integer);
10897
10898             if not Is_Static_Expression (Arg) then
10899                Check_Restriction (Static_Storage_Size, Arg);
10900             end if;
10901
10902             if Nkind (P) /= N_Task_Definition then
10903                Pragma_Misplaced;
10904                return;
10905
10906             else
10907                if Has_Storage_Size_Pragma (P) then
10908                   Error_Pragma ("duplicate pragma% not allowed");
10909                else
10910                   Set_Has_Storage_Size_Pragma (P, True);
10911                end if;
10912
10913                Record_Rep_Item (Defining_Identifier (Parent (P)), N);
10914                --  ???  exp_ch9 should use this!
10915             end if;
10916          end Storage_Size;
10917
10918          ------------------
10919          -- Storage_Unit --
10920          ------------------
10921
10922          --  pragma Storage_Unit (NUMERIC_LITERAL);
10923
10924          --  Only permitted argument is System'Storage_Unit value
10925
10926          when Pragma_Storage_Unit =>
10927             Check_No_Identifiers;
10928             Check_Arg_Count (1);
10929             Check_Arg_Is_Integer_Literal (Arg1);
10930
10931             if Intval (Expression (Arg1)) /=
10932               UI_From_Int (Ttypes.System_Storage_Unit)
10933             then
10934                Error_Msg_Uint_1 := UI_From_Int (Ttypes.System_Storage_Unit);
10935                Error_Pragma_Arg
10936                  ("the only allowed argument for pragma% is ^", Arg1);
10937             end if;
10938
10939          --------------------
10940          -- Stream_Convert --
10941          --------------------
10942
10943          --  pragma Stream_Convert (
10944          --    [Entity =>] type_LOCAL_NAME,
10945          --    [Read   =>] function_NAME,
10946          --    [Write  =>] function NAME);
10947
10948          when Pragma_Stream_Convert => Stream_Convert : declare
10949
10950             procedure Check_OK_Stream_Convert_Function (Arg : Node_Id);
10951             --  Check that the given argument is the name of a local function
10952             --  of one argument that is not overloaded earlier in the current
10953             --  local scope. A check is also made that the argument is a
10954             --  function with one parameter.
10955
10956             --------------------------------------
10957             -- Check_OK_Stream_Convert_Function --
10958             --------------------------------------
10959
10960             procedure Check_OK_Stream_Convert_Function (Arg : Node_Id) is
10961                Ent : Entity_Id;
10962
10963             begin
10964                Check_Arg_Is_Local_Name (Arg);
10965                Ent := Entity (Expression (Arg));
10966
10967                if Has_Homonym (Ent) then
10968                   Error_Pragma_Arg
10969                     ("argument for pragma% may not be overloaded", Arg);
10970                end if;
10971
10972                if Ekind (Ent) /= E_Function
10973                  or else No (First_Formal (Ent))
10974                  or else Present (Next_Formal (First_Formal (Ent)))
10975                then
10976                   Error_Pragma_Arg
10977                     ("argument for pragma% must be" &
10978                      " function of one argument", Arg);
10979                end if;
10980             end Check_OK_Stream_Convert_Function;
10981
10982          --  Start of processing for Stream_Convert
10983
10984          begin
10985             GNAT_Pragma;
10986             Check_Arg_Order ((Name_Entity, Name_Read, Name_Write));
10987             Check_Arg_Count (3);
10988             Check_Optional_Identifier (Arg1, Name_Entity);
10989             Check_Optional_Identifier (Arg2, Name_Read);
10990             Check_Optional_Identifier (Arg3, Name_Write);
10991             Check_Arg_Is_Local_Name (Arg1);
10992             Check_OK_Stream_Convert_Function (Arg2);
10993             Check_OK_Stream_Convert_Function (Arg3);
10994
10995             declare
10996                Typ   : constant Entity_Id :=
10997                          Underlying_Type (Entity (Expression (Arg1)));
10998                Read  : constant Entity_Id := Entity (Expression (Arg2));
10999                Write : constant Entity_Id := Entity (Expression (Arg3));
11000
11001             begin
11002                Check_First_Subtype (Arg1);
11003
11004                --  Check for too early or too late. Note that we don't enforce
11005                --  the rule about primitive operations in this case, since, as
11006                --  is the case for explicit stream attributes themselves, these
11007                --  restrictions are not appropriate. Note that the chaining of
11008                --  the pragma by Rep_Item_Too_Late is actually the critical
11009                --  processing done for this pragma.
11010
11011                if Rep_Item_Too_Early (Typ, N)
11012                     or else
11013                   Rep_Item_Too_Late (Typ, N, FOnly => True)
11014                then
11015                   return;
11016                end if;
11017
11018                --  Return if previous error
11019
11020                if Etype (Typ) = Any_Type
11021                     or else
11022                   Etype (Read) = Any_Type
11023                     or else
11024                   Etype (Write) = Any_Type
11025                then
11026                   return;
11027                end if;
11028
11029                --  Error checks
11030
11031                if Underlying_Type (Etype (Read)) /= Typ then
11032                   Error_Pragma_Arg
11033                     ("incorrect return type for function&", Arg2);
11034                end if;
11035
11036                if Underlying_Type (Etype (First_Formal (Write))) /= Typ then
11037                   Error_Pragma_Arg
11038                     ("incorrect parameter type for function&", Arg3);
11039                end if;
11040
11041                if Underlying_Type (Etype (First_Formal (Read))) /=
11042                   Underlying_Type (Etype (Write))
11043                then
11044                   Error_Pragma_Arg
11045                     ("result type of & does not match Read parameter type",
11046                      Arg3);
11047                end if;
11048             end;
11049          end Stream_Convert;
11050
11051          -------------------------
11052          -- Style_Checks (GNAT) --
11053          -------------------------
11054
11055          --  pragma Style_Checks (On | Off | ALL_CHECKS | STRING_LITERAL);
11056
11057          --  This is processed by the parser since some of the style checks
11058          --  take place during source scanning and parsing. This means that
11059          --  we don't need to issue error messages here.
11060
11061          when Pragma_Style_Checks => Style_Checks : declare
11062             A  : constant Node_Id   := Expression (Arg1);
11063             S  : String_Id;
11064             C  : Char_Code;
11065
11066          begin
11067             GNAT_Pragma;
11068             Check_No_Identifiers;
11069
11070             --  Two argument form
11071
11072             if Arg_Count = 2 then
11073                Check_Arg_Is_One_Of (Arg1, Name_On, Name_Off);
11074
11075                declare
11076                   E_Id : Node_Id;
11077                   E    : Entity_Id;
11078
11079                begin
11080                   E_Id := Expression (Arg2);
11081                   Analyze (E_Id);
11082
11083                   if not Is_Entity_Name (E_Id) then
11084                      Error_Pragma_Arg
11085                        ("second argument of pragma% must be entity name",
11086                         Arg2);
11087                   end if;
11088
11089                   E := Entity (E_Id);
11090
11091                   if E = Any_Id then
11092                      return;
11093                   else
11094                      loop
11095                         Set_Suppress_Style_Checks (E,
11096                           (Chars (Expression (Arg1)) = Name_Off));
11097                         exit when No (Homonym (E));
11098                         E := Homonym (E);
11099                      end loop;
11100                   end if;
11101                end;
11102
11103             --  One argument form
11104
11105             else
11106                Check_Arg_Count (1);
11107
11108                if Nkind (A) = N_String_Literal then
11109                   S   := Strval (A);
11110
11111                   declare
11112                      Slen    : constant Natural := Natural (String_Length (S));
11113                      Options : String (1 .. Slen);
11114                      J       : Natural;
11115
11116                   begin
11117                      J := 1;
11118                      loop
11119                         C := Get_String_Char (S, Int (J));
11120                         exit when not In_Character_Range (C);
11121                         Options (J) := Get_Character (C);
11122
11123                         --  If at end of string, set options. As per discussion
11124                         --  above, no need to check for errors, since we issued
11125                         --  them in the parser.
11126
11127                         if J = Slen then
11128                            Set_Style_Check_Options (Options);
11129                            exit;
11130                         end if;
11131
11132                         J := J + 1;
11133                      end loop;
11134                   end;
11135
11136                elsif Nkind (A) = N_Identifier then
11137                   if Chars (A) = Name_All_Checks then
11138                      Set_Default_Style_Check_Options;
11139
11140                   elsif Chars (A) = Name_On then
11141                      Style_Check := True;
11142
11143                   elsif Chars (A) = Name_Off then
11144                      Style_Check := False;
11145                   end if;
11146                end if;
11147             end if;
11148          end Style_Checks;
11149
11150          --------------
11151          -- Subtitle --
11152          --------------
11153
11154          --  pragma Subtitle ([Subtitle =>] STRING_LITERAL);
11155
11156          when Pragma_Subtitle =>
11157             GNAT_Pragma;
11158             Check_Arg_Count (1);
11159             Check_Optional_Identifier (Arg1, Name_Subtitle);
11160             Check_Arg_Is_String_Literal (Arg1);
11161
11162          --------------
11163          -- Suppress --
11164          --------------
11165
11166          --  pragma Suppress (IDENTIFIER [, [On =>] NAME]);
11167
11168          when Pragma_Suppress =>
11169             Process_Suppress_Unsuppress (True);
11170
11171          ------------------
11172          -- Suppress_All --
11173          ------------------
11174
11175          --  pragma Suppress_All;
11176
11177          --  The only check made here is that the pragma appears in the proper
11178          --  place, i.e. following a compilation unit. If indeed it appears in
11179          --  this context, then the parser has already inserted an equivalent
11180          --  pragma Suppress (All_Checks) to get the required effect.
11181
11182          when Pragma_Suppress_All =>
11183             GNAT_Pragma;
11184             Check_Arg_Count (0);
11185
11186             if Nkind (Parent (N)) /= N_Compilation_Unit_Aux
11187               or else not Is_List_Member (N)
11188               or else List_Containing (N) /= Pragmas_After (Parent (N))
11189             then
11190                Error_Pragma
11191                  ("misplaced pragma%, must follow compilation unit");
11192             end if;
11193
11194          -------------------------
11195          -- Suppress_Debug_Info --
11196          -------------------------
11197
11198          --  pragma Suppress_Debug_Info ([Entity =>] LOCAL_NAME);
11199
11200          when Pragma_Suppress_Debug_Info =>
11201             GNAT_Pragma;
11202             Check_Arg_Count (1);
11203             Check_Optional_Identifier (Arg1, Name_Entity);
11204             Check_Arg_Is_Local_Name (Arg1);
11205             Set_Debug_Info_Off (Entity (Get_Pragma_Arg (Arg1)));
11206
11207          ----------------------------------
11208          -- Suppress_Exception_Locations --
11209          ----------------------------------
11210
11211          --  pragma Suppress_Exception_Locations;
11212
11213          when Pragma_Suppress_Exception_Locations =>
11214             GNAT_Pragma;
11215             Check_Arg_Count (0);
11216             Check_Valid_Configuration_Pragma;
11217             Exception_Locations_Suppressed := True;
11218
11219          -----------------------------
11220          -- Suppress_Initialization --
11221          -----------------------------
11222
11223          --  pragma Suppress_Initialization ([Entity =>] type_Name);
11224
11225          when Pragma_Suppress_Initialization => Suppress_Init : declare
11226             E_Id : Node_Id;
11227             E    : Entity_Id;
11228
11229          begin
11230             GNAT_Pragma;
11231             Check_Arg_Count (1);
11232             Check_Optional_Identifier (Arg1, Name_Entity);
11233             Check_Arg_Is_Local_Name (Arg1);
11234
11235             E_Id := Expression (Arg1);
11236
11237             if Etype (E_Id) = Any_Type then
11238                return;
11239             end if;
11240
11241             E := Entity (E_Id);
11242
11243             if Is_Type (E) then
11244                if Is_Incomplete_Or_Private_Type (E) then
11245                   if No (Full_View (Base_Type (E))) then
11246                      Error_Pragma_Arg
11247                        ("argument of pragma% cannot be an incomplete type",
11248                          Arg1);
11249                   else
11250                      Set_Suppress_Init_Proc (Full_View (Base_Type (E)));
11251                   end if;
11252                else
11253                   Set_Suppress_Init_Proc (Base_Type (E));
11254                end if;
11255
11256             else
11257                Error_Pragma_Arg
11258                  ("pragma% requires argument that is a type name", Arg1);
11259             end if;
11260          end Suppress_Init;
11261
11262          -----------------
11263          -- System_Name --
11264          -----------------
11265
11266          --  pragma System_Name (DIRECT_NAME);
11267
11268          --  Syntax check: one argument, which must be the identifier GNAT or
11269          --  the identifier GCC, no other identifiers are acceptable.
11270
11271          when Pragma_System_Name =>
11272             GNAT_Pragma;
11273             Check_No_Identifiers;
11274             Check_Arg_Count (1);
11275             Check_Arg_Is_One_Of (Arg1, Name_Gcc, Name_Gnat);
11276
11277          -----------------------------
11278          -- Task_Dispatching_Policy --
11279          -----------------------------
11280
11281          --  pragma Task_Dispatching_Policy (policy_IDENTIFIER);
11282
11283          when Pragma_Task_Dispatching_Policy => declare
11284             DP : Character;
11285
11286          begin
11287             Check_Ada_83_Warning;
11288             Check_Arg_Count (1);
11289             Check_No_Identifiers;
11290             Check_Arg_Is_Task_Dispatching_Policy (Arg1);
11291             Check_Valid_Configuration_Pragma;
11292             Get_Name_String (Chars (Expression (Arg1)));
11293             DP := Fold_Upper (Name_Buffer (1));
11294
11295             if Task_Dispatching_Policy /= ' '
11296               and then Task_Dispatching_Policy /= DP
11297             then
11298                Error_Msg_Sloc := Task_Dispatching_Policy_Sloc;
11299                Error_Pragma
11300                  ("task dispatching policy incompatible with policy#");
11301
11302             --  Set new policy, but always preserve System_Location since we
11303             --  like the error message with the run time name.
11304
11305             else
11306                Task_Dispatching_Policy := DP;
11307
11308                if Task_Dispatching_Policy_Sloc /= System_Location then
11309                   Task_Dispatching_Policy_Sloc := Loc;
11310                end if;
11311             end if;
11312          end;
11313
11314          --------------
11315          -- Task_Info --
11316          --------------
11317
11318          --  pragma Task_Info (EXPRESSION);
11319
11320          when Pragma_Task_Info => Task_Info : declare
11321             P : constant Node_Id := Parent (N);
11322
11323          begin
11324             GNAT_Pragma;
11325
11326             if Nkind (P) /= N_Task_Definition then
11327                Error_Pragma ("pragma% must appear in task definition");
11328             end if;
11329
11330             Check_No_Identifiers;
11331             Check_Arg_Count (1);
11332
11333             Analyze_And_Resolve (Expression (Arg1), RTE (RE_Task_Info_Type));
11334
11335             if Etype (Expression (Arg1)) = Any_Type then
11336                return;
11337             end if;
11338
11339             if Has_Task_Info_Pragma (P) then
11340                Error_Pragma ("duplicate pragma% not allowed");
11341             else
11342                Set_Has_Task_Info_Pragma (P, True);
11343             end if;
11344          end Task_Info;
11345
11346          ---------------
11347          -- Task_Name --
11348          ---------------
11349
11350          --  pragma Task_Name (string_EXPRESSION);
11351
11352          when Pragma_Task_Name => Task_Name : declare
11353             P   : constant Node_Id := Parent (N);
11354             Arg : Node_Id;
11355
11356          begin
11357             Check_No_Identifiers;
11358             Check_Arg_Count (1);
11359
11360             Arg := Expression (Arg1);
11361
11362             --  The expression is used in the call to Create_Task, and must be
11363             --  expanded there, not in the context of the current spec. It must
11364             --  however be analyzed to capture global references, in case it
11365             --  appears in a generic context.
11366
11367             Preanalyze_And_Resolve (Arg, Standard_String);
11368
11369             if Nkind (P) /= N_Task_Definition then
11370                Pragma_Misplaced;
11371             end if;
11372
11373             if Has_Task_Name_Pragma (P) then
11374                Error_Pragma ("duplicate pragma% not allowed");
11375             else
11376                Set_Has_Task_Name_Pragma (P, True);
11377                Record_Rep_Item (Defining_Identifier (Parent (P)), N);
11378             end if;
11379          end Task_Name;
11380
11381          ------------------
11382          -- Task_Storage --
11383          ------------------
11384
11385          --  pragma Task_Storage (
11386          --     [Task_Type =>] LOCAL_NAME,
11387          --     [Top_Guard =>] static_integer_EXPRESSION);
11388
11389          when Pragma_Task_Storage => Task_Storage : declare
11390             Args  : Args_List (1 .. 2);
11391             Names : constant Name_List (1 .. 2) := (
11392                       Name_Task_Type,
11393                       Name_Top_Guard);
11394
11395             Task_Type : Node_Id renames Args (1);
11396             Top_Guard : Node_Id renames Args (2);
11397
11398             Ent : Entity_Id;
11399
11400          begin
11401             GNAT_Pragma;
11402             Gather_Associations (Names, Args);
11403
11404             if No (Task_Type) then
11405                Error_Pragma
11406                  ("missing task_type argument for pragma%");
11407             end if;
11408
11409             Check_Arg_Is_Local_Name (Task_Type);
11410
11411             Ent := Entity (Task_Type);
11412
11413             if not Is_Task_Type (Ent) then
11414                Error_Pragma_Arg
11415                  ("argument for pragma% must be task type", Task_Type);
11416             end if;
11417
11418             if No (Top_Guard) then
11419                Error_Pragma_Arg
11420                  ("pragma% takes two arguments", Task_Type);
11421             else
11422                Check_Arg_Is_Static_Expression (Top_Guard, Any_Integer);
11423             end if;
11424
11425             Check_First_Subtype (Task_Type);
11426
11427             if Rep_Item_Too_Late (Ent, N) then
11428                raise Pragma_Exit;
11429             end if;
11430          end Task_Storage;
11431
11432          --------------------------
11433          -- Thread_Local_Storage --
11434          --------------------------
11435
11436          --  pragma Thread_Local_Storage ([Entity =>] LOCAL_NAME);
11437
11438          when Pragma_Thread_Local_Storage => Thread_Local_Storage : declare
11439             Id : Node_Id;
11440             E  : Entity_Id;
11441
11442          begin
11443             GNAT_Pragma;
11444             Check_Arg_Count (1);
11445             Check_Optional_Identifier (Arg1, Name_Entity);
11446             Check_Arg_Is_Library_Level_Local_Name (Arg1);
11447
11448             Id := Expression (Arg1);
11449             Analyze (Id);
11450
11451             if not Is_Entity_Name (Id)
11452               or else Ekind (Entity (Id)) /= E_Variable
11453             then
11454                Error_Pragma_Arg ("local variable name required", Arg1);
11455             end if;
11456
11457             E := Entity (Id);
11458
11459             if Rep_Item_Too_Early (E, N)
11460               or else Rep_Item_Too_Late (E, N)
11461             then
11462                raise Pragma_Exit;
11463             end if;
11464
11465             Set_Has_Pragma_Thread_Local_Storage (E);
11466             Set_Has_Gigi_Rep_Item (E);
11467          end Thread_Local_Storage;
11468
11469          ----------------
11470          -- Time_Slice --
11471          ----------------
11472
11473          --  pragma Time_Slice (static_duration_EXPRESSION);
11474
11475          when Pragma_Time_Slice => Time_Slice : declare
11476             Val : Ureal;
11477             Nod : Node_Id;
11478
11479          begin
11480             GNAT_Pragma;
11481             Check_Arg_Count (1);
11482             Check_No_Identifiers;
11483             Check_In_Main_Program;
11484             Check_Arg_Is_Static_Expression (Arg1, Standard_Duration);
11485
11486             if not Error_Posted (Arg1) then
11487                Nod := Next (N);
11488                while Present (Nod) loop
11489                   if Nkind (Nod) = N_Pragma
11490                     and then Pragma_Name (Nod) = Name_Time_Slice
11491                   then
11492                      Error_Msg_Name_1 := Pname;
11493                      Error_Msg_N ("duplicate pragma% not permitted", Nod);
11494                   end if;
11495
11496                   Next (Nod);
11497                end loop;
11498             end if;
11499
11500             --  Process only if in main unit
11501
11502             if Get_Source_Unit (Loc) = Main_Unit then
11503                Opt.Time_Slice_Set := True;
11504                Val := Expr_Value_R (Expression (Arg1));
11505
11506                if Val <= Ureal_0 then
11507                   Opt.Time_Slice_Value := 0;
11508
11509                elsif Val > UR_From_Uint (UI_From_Int (1000)) then
11510                   Opt.Time_Slice_Value := 1_000_000_000;
11511
11512                else
11513                   Opt.Time_Slice_Value :=
11514                     UI_To_Int (UR_To_Uint (Val * UI_From_Int (1_000_000)));
11515                end if;
11516             end if;
11517          end Time_Slice;
11518
11519          -----------
11520          -- Title --
11521          -----------
11522
11523          --  pragma Title (TITLING_OPTION [, TITLING OPTION]);
11524
11525          --   TITLING_OPTION ::=
11526          --     [Title =>] STRING_LITERAL
11527          --   | [Subtitle =>] STRING_LITERAL
11528
11529          when Pragma_Title => Title : declare
11530             Args  : Args_List (1 .. 2);
11531             Names : constant Name_List (1 .. 2) := (
11532                       Name_Title,
11533                       Name_Subtitle);
11534
11535          begin
11536             GNAT_Pragma;
11537             Gather_Associations (Names, Args);
11538
11539             for J in 1 .. 2 loop
11540                if Present (Args (J)) then
11541                   Check_Arg_Is_String_Literal (Args (J));
11542                end if;
11543             end loop;
11544          end Title;
11545
11546          ---------------------
11547          -- Unchecked_Union --
11548          ---------------------
11549
11550          --  pragma Unchecked_Union (first_subtype_LOCAL_NAME)
11551
11552          when Pragma_Unchecked_Union => Unchecked_Union : declare
11553             Assoc   : constant Node_Id := Arg1;
11554             Type_Id : constant Node_Id := Expression (Assoc);
11555             Typ     : Entity_Id;
11556             Discr   : Entity_Id;
11557             Tdef    : Node_Id;
11558             Clist   : Node_Id;
11559             Vpart   : Node_Id;
11560             Comp    : Node_Id;
11561             Variant : Node_Id;
11562
11563          begin
11564             Ada_2005_Pragma;
11565             Check_No_Identifiers;
11566             Check_Arg_Count (1);
11567             Check_Arg_Is_Local_Name (Arg1);
11568
11569             Find_Type (Type_Id);
11570             Typ := Entity (Type_Id);
11571
11572             if Typ = Any_Type
11573               or else Rep_Item_Too_Early (Typ, N)
11574             then
11575                return;
11576             else
11577                Typ := Underlying_Type (Typ);
11578             end if;
11579
11580             if Rep_Item_Too_Late (Typ, N) then
11581                return;
11582             end if;
11583
11584             Check_First_Subtype (Arg1);
11585
11586             --  Note remaining cases are references to a type in the current
11587             --  declarative part. If we find an error, we post the error on
11588             --  the relevant type declaration at an appropriate point.
11589
11590             if not Is_Record_Type (Typ) then
11591                Error_Msg_N ("Unchecked_Union must be record type", Typ);
11592                return;
11593
11594             elsif Is_Tagged_Type (Typ) then
11595                Error_Msg_N ("Unchecked_Union must not be tagged", Typ);
11596                return;
11597
11598             elsif Is_Limited_Type (Typ) then
11599                Error_Msg_N
11600                  ("Unchecked_Union must not be limited record type", Typ);
11601                Explain_Limited_Type (Typ, Typ);
11602                return;
11603
11604             else
11605                if not Has_Discriminants (Typ) then
11606                   Error_Msg_N
11607                     ("Unchecked_Union must have one discriminant", Typ);
11608                   return;
11609                end if;
11610
11611                Discr := First_Discriminant (Typ);
11612                while Present (Discr) loop
11613                   if No (Discriminant_Default_Value (Discr)) then
11614                      Error_Msg_N
11615                        ("Unchecked_Union discriminant must have default value",
11616                         Discr);
11617                   end if;
11618                   Next_Discriminant (Discr);
11619                end loop;
11620
11621                Tdef  := Type_Definition (Declaration_Node (Typ));
11622                Clist := Component_List (Tdef);
11623
11624                Comp := First (Component_Items (Clist));
11625                while Present (Comp) loop
11626                   Check_Component (Comp);
11627                   Next (Comp);
11628                end loop;
11629
11630                if No (Clist) or else No (Variant_Part (Clist)) then
11631                   Error_Msg_N
11632                     ("Unchecked_Union must have variant part",
11633                      Tdef);
11634                   return;
11635                end if;
11636
11637                Vpart := Variant_Part (Clist);
11638
11639                Variant := First (Variants (Vpart));
11640                while Present (Variant) loop
11641                   Check_Variant (Variant);
11642                   Next (Variant);
11643                end loop;
11644             end if;
11645
11646             Set_Is_Unchecked_Union  (Typ, True);
11647             Set_Convention          (Typ, Convention_C);
11648
11649             Set_Has_Unchecked_Union (Base_Type (Typ), True);
11650             Set_Is_Unchecked_Union  (Base_Type (Typ), True);
11651          end Unchecked_Union;
11652
11653          ------------------------
11654          -- Unimplemented_Unit --
11655          ------------------------
11656
11657          --  pragma Unimplemented_Unit;
11658
11659          --  Note: this only gives an error if we are generating code, or if
11660          --  we are in a generic library unit (where the pragma appears in the
11661          --  body, not in the spec).
11662
11663          when Pragma_Unimplemented_Unit => Unimplemented_Unit : declare
11664             Cunitent : constant Entity_Id :=
11665                          Cunit_Entity (Get_Source_Unit (Loc));
11666             Ent_Kind : constant Entity_Kind :=
11667                          Ekind (Cunitent);
11668
11669          begin
11670             GNAT_Pragma;
11671             Check_Arg_Count (0);
11672
11673             if Operating_Mode = Generate_Code
11674               or else Ent_Kind = E_Generic_Function
11675               or else Ent_Kind = E_Generic_Procedure
11676               or else Ent_Kind = E_Generic_Package
11677             then
11678                Get_Name_String (Chars (Cunitent));
11679                Set_Casing (Mixed_Case);
11680                Write_Str (Name_Buffer (1 .. Name_Len));
11681                Write_Str (" is not supported in this configuration");
11682                Write_Eol;
11683                raise Unrecoverable_Error;
11684             end if;
11685          end Unimplemented_Unit;
11686
11687          ------------------------
11688          -- Universal_Aliasing --
11689          ------------------------
11690
11691          --  pragma Universal_Aliasing [([Entity =>] type_LOCAL_NAME)];
11692
11693          when Pragma_Universal_Aliasing => Universal_Alias : declare
11694             E_Id : Entity_Id;
11695
11696          begin
11697             GNAT_Pragma;
11698             Check_Arg_Count (1);
11699             Check_Optional_Identifier (Arg2, Name_Entity);
11700             Check_Arg_Is_Local_Name (Arg1);
11701             E_Id := Entity (Expression (Arg1));
11702
11703             if E_Id = Any_Type then
11704                return;
11705             elsif No (E_Id) or else not Is_Type (E_Id) then
11706                Error_Pragma_Arg ("pragma% requires type", Arg1);
11707             end if;
11708
11709             Set_Universal_Aliasing (Implementation_Base_Type (E_Id));
11710          end Universal_Alias;
11711
11712          --------------------
11713          -- Universal_Data --
11714          --------------------
11715
11716          --  pragma Universal_Data [(library_unit_NAME)];
11717
11718          when Pragma_Universal_Data =>
11719             GNAT_Pragma;
11720
11721             --  If this is a configuration pragma, then set the universal
11722             --  addressing option, otherwise confirm that the pragma satisfies
11723             --  the requirements of library unit pragma placement and leave it
11724             --  to the GNAAMP back end to detect the pragma (avoids transitive
11725             --  setting of the option due to withed units).
11726
11727             if Is_Configuration_Pragma then
11728                Universal_Addressing_On_AAMP := True;
11729             else
11730                Check_Valid_Library_Unit_Pragma;
11731             end if;
11732
11733             if not AAMP_On_Target then
11734                Error_Pragma ("?pragma% ignored (applies only to AAMP)");
11735             end if;
11736
11737          ----------------
11738          -- Unmodified --
11739          ----------------
11740
11741          --  pragma Unmodified (local_Name {, local_Name});
11742
11743          when Pragma_Unmodified => Unmodified : declare
11744             Arg_Node : Node_Id;
11745             Arg_Expr : Node_Id;
11746             Arg_Ent  : Entity_Id;
11747
11748          begin
11749             GNAT_Pragma;
11750             Check_At_Least_N_Arguments (1);
11751
11752             --  Loop through arguments
11753
11754             Arg_Node := Arg1;
11755             while Present (Arg_Node) loop
11756                Check_No_Identifier (Arg_Node);
11757
11758                --  Note: the analyze call done by Check_Arg_Is_Local_Name will
11759                --  in fact generate reference, so that the entity will have a
11760                --  reference, which will inhibit any warnings about it not
11761                --  being referenced, and also properly show up in the ali file
11762                --  as a reference. But this reference is recorded before the
11763                --  Has_Pragma_Unreferenced flag is set, so that no warning is
11764                --  generated for this reference.
11765
11766                Check_Arg_Is_Local_Name (Arg_Node);
11767                Arg_Expr := Get_Pragma_Arg (Arg_Node);
11768
11769                if Is_Entity_Name (Arg_Expr) then
11770                   Arg_Ent := Entity (Arg_Expr);
11771
11772                   if not Is_Assignable (Arg_Ent) then
11773                      Error_Pragma_Arg
11774                        ("pragma% can only be applied to a variable",
11775                         Arg_Expr);
11776                   else
11777                      Set_Has_Pragma_Unmodified (Arg_Ent);
11778                   end if;
11779                end if;
11780
11781                Next (Arg_Node);
11782             end loop;
11783          end Unmodified;
11784
11785          ------------------
11786          -- Unreferenced --
11787          ------------------
11788
11789          --  pragma Unreferenced (local_Name {, local_Name});
11790
11791          --    or when used in a context clause:
11792
11793          --  pragma Unreferenced (library_unit_NAME {, library_unit_NAME}
11794
11795          when Pragma_Unreferenced => Unreferenced : declare
11796             Arg_Node : Node_Id;
11797             Arg_Expr : Node_Id;
11798             Arg_Ent  : Entity_Id;
11799             Citem    : Node_Id;
11800
11801          begin
11802             GNAT_Pragma;
11803             Check_At_Least_N_Arguments (1);
11804
11805             --  Check case of appearing within context clause
11806
11807             if Is_In_Context_Clause then
11808
11809                --  The arguments must all be units mentioned in a with clause
11810                --  in the same context clause. Note we already checked (in
11811                --  Par.Prag) that the arguments are either identifiers or
11812                --  selected components.
11813
11814                Arg_Node := Arg1;
11815                while Present (Arg_Node) loop
11816                   Citem := First (List_Containing (N));
11817                   while Citem /= N loop
11818                      if Nkind (Citem) = N_With_Clause
11819                        and then Same_Name (Name (Citem), Expression (Arg_Node))
11820                      then
11821                         Set_Has_Pragma_Unreferenced
11822                           (Cunit_Entity
11823                              (Get_Source_Unit
11824                                 (Library_Unit (Citem))));
11825                         Set_Unit_Name (Expression (Arg_Node), Name (Citem));
11826                         exit;
11827                      end if;
11828
11829                      Next (Citem);
11830                   end loop;
11831
11832                   if Citem = N then
11833                      Error_Pragma_Arg
11834                        ("argument of pragma% is not with'ed unit", Arg_Node);
11835                   end if;
11836
11837                   Next (Arg_Node);
11838                end loop;
11839
11840             --  Case of not in list of context items
11841
11842             else
11843                Arg_Node := Arg1;
11844                while Present (Arg_Node) loop
11845                   Check_No_Identifier (Arg_Node);
11846
11847                   --  Note: the analyze call done by Check_Arg_Is_Local_Name
11848                   --  will in fact generate reference, so that the entity will
11849                   --  have a reference, which will inhibit any warnings about
11850                   --  it not being referenced, and also properly show up in the
11851                   --  ali file as a reference. But this reference is recorded
11852                   --  before the Has_Pragma_Unreferenced flag is set, so that
11853                   --  no warning is generated for this reference.
11854
11855                   Check_Arg_Is_Local_Name (Arg_Node);
11856                   Arg_Expr := Get_Pragma_Arg (Arg_Node);
11857
11858                   if Is_Entity_Name (Arg_Expr) then
11859                      Arg_Ent := Entity (Arg_Expr);
11860
11861                      --  If the entity is overloaded, the pragma applies to the
11862                      --  most recent overloading, as documented. In this case,
11863                      --  name resolution does not generate a reference, so it
11864                      --  must be done here explicitly.
11865
11866                      if Is_Overloaded (Arg_Expr) then
11867                         Generate_Reference (Arg_Ent, N);
11868                      end if;
11869
11870                      Set_Has_Pragma_Unreferenced (Arg_Ent);
11871                   end if;
11872
11873                   Next (Arg_Node);
11874                end loop;
11875             end if;
11876          end Unreferenced;
11877
11878          --------------------------
11879          -- Unreferenced_Objects --
11880          --------------------------
11881
11882          --  pragma Unreferenced_Objects (local_Name {, local_Name});
11883
11884          when Pragma_Unreferenced_Objects => Unreferenced_Objects : declare
11885             Arg_Node : Node_Id;
11886             Arg_Expr : Node_Id;
11887
11888          begin
11889             GNAT_Pragma;
11890             Check_At_Least_N_Arguments (1);
11891
11892             Arg_Node := Arg1;
11893             while Present (Arg_Node) loop
11894                Check_No_Identifier (Arg_Node);
11895                Check_Arg_Is_Local_Name (Arg_Node);
11896                Arg_Expr := Get_Pragma_Arg (Arg_Node);
11897
11898                if not Is_Entity_Name (Arg_Expr)
11899                  or else not Is_Type (Entity (Arg_Expr))
11900                then
11901                   Error_Pragma_Arg
11902                     ("argument for pragma% must be type or subtype", Arg_Node);
11903                end if;
11904
11905                Set_Has_Pragma_Unreferenced_Objects (Entity (Arg_Expr));
11906                Next (Arg_Node);
11907             end loop;
11908          end Unreferenced_Objects;
11909
11910          ------------------------------
11911          -- Unreserve_All_Interrupts --
11912          ------------------------------
11913
11914          --  pragma Unreserve_All_Interrupts;
11915
11916          when Pragma_Unreserve_All_Interrupts =>
11917             GNAT_Pragma;
11918             Check_Arg_Count (0);
11919
11920             if In_Extended_Main_Code_Unit (Main_Unit_Entity) then
11921                Unreserve_All_Interrupts := True;
11922             end if;
11923
11924          ----------------
11925          -- Unsuppress --
11926          ----------------
11927
11928          --  pragma Unsuppress (IDENTIFIER [, [On =>] NAME]);
11929
11930          when Pragma_Unsuppress =>
11931             Ada_2005_Pragma;
11932             Process_Suppress_Unsuppress (False);
11933
11934          -------------------
11935          -- Use_VADS_Size --
11936          -------------------
11937
11938          --  pragma Use_VADS_Size;
11939
11940          when Pragma_Use_VADS_Size =>
11941             GNAT_Pragma;
11942             Check_Arg_Count (0);
11943             Check_Valid_Configuration_Pragma;
11944             Use_VADS_Size := True;
11945
11946          ---------------------
11947          -- Validity_Checks --
11948          ---------------------
11949
11950          --  pragma Validity_Checks (On | Off | ALL_CHECKS | STRING_LITERAL);
11951
11952          when Pragma_Validity_Checks => Validity_Checks : declare
11953             A  : constant Node_Id   := Expression (Arg1);
11954             S  : String_Id;
11955             C  : Char_Code;
11956
11957          begin
11958             GNAT_Pragma;
11959             Check_Arg_Count (1);
11960             Check_No_Identifiers;
11961
11962             if Nkind (A) = N_String_Literal then
11963                S   := Strval (A);
11964
11965                declare
11966                   Slen    : constant Natural := Natural (String_Length (S));
11967                   Options : String (1 .. Slen);
11968                   J       : Natural;
11969
11970                begin
11971                   J := 1;
11972                   loop
11973                      C := Get_String_Char (S, Int (J));
11974                      exit when not In_Character_Range (C);
11975                      Options (J) := Get_Character (C);
11976
11977                      if J = Slen then
11978                         Set_Validity_Check_Options (Options);
11979                         exit;
11980                      else
11981                         J := J + 1;
11982                      end if;
11983                   end loop;
11984                end;
11985
11986             elsif Nkind (A) = N_Identifier then
11987
11988                if Chars (A) = Name_All_Checks then
11989                   Set_Validity_Check_Options ("a");
11990
11991                elsif Chars (A) = Name_On then
11992                   Validity_Checks_On := True;
11993
11994                elsif Chars (A) = Name_Off then
11995                   Validity_Checks_On := False;
11996
11997                end if;
11998             end if;
11999          end Validity_Checks;
12000
12001          --------------
12002          -- Volatile --
12003          --------------
12004
12005          --  pragma Volatile (LOCAL_NAME);
12006
12007          when Pragma_Volatile =>
12008             Process_Atomic_Shared_Volatile;
12009
12010          -------------------------
12011          -- Volatile_Components --
12012          -------------------------
12013
12014          --  pragma Volatile_Components (array_LOCAL_NAME);
12015
12016          --  Volatile is handled by the same circuit as Atomic_Components
12017
12018          --------------
12019          -- Warnings --
12020          --------------
12021
12022          --  pragma Warnings (On | Off);
12023          --  pragma Warnings (On | Off, LOCAL_NAME);
12024          --  pragma Warnings (static_string_EXPRESSION);
12025          --  pragma Warnings (On | Off, STRING_LITERAL);
12026
12027          when Pragma_Warnings => Warnings : begin
12028             GNAT_Pragma;
12029             Check_At_Least_N_Arguments (1);
12030             Check_No_Identifiers;
12031
12032             --  If debug flag -gnatd.i is set, pragma is ignored
12033
12034             if Debug_Flag_Dot_I then
12035                return;
12036             end if;
12037
12038             --  Process various forms of the pragma
12039
12040             declare
12041                Argx : constant Node_Id := Get_Pragma_Arg (Arg1);
12042
12043             begin
12044                --  One argument case
12045
12046                if Arg_Count = 1 then
12047
12048                   --  On/Off one argument case was processed by parser
12049
12050                   if Nkind (Argx) = N_Identifier
12051                     and then
12052                       (Chars (Argx) = Name_On
12053                          or else
12054                        Chars (Argx) = Name_Off)
12055                   then
12056                      null;
12057
12058                   --  One argument case must be ON/OFF or static string expr
12059
12060                   elsif not Is_Static_String_Expression (Arg1) then
12061                      Error_Pragma_Arg
12062                        ("argument of pragma% must be On/Off or " &
12063                         "static string expression", Arg2);
12064
12065                   --  One argument string expression case
12066
12067                   else
12068                      declare
12069                         Lit : constant Node_Id   := Expr_Value_S (Argx);
12070                         Str : constant String_Id := Strval (Lit);
12071                         Len : constant Nat       := String_Length (Str);
12072                         C   : Char_Code;
12073                         J   : Nat;
12074                         OK  : Boolean;
12075                         Chr : Character;
12076
12077                      begin
12078                         J := 1;
12079                         while J <= Len loop
12080                            C := Get_String_Char (Str, J);
12081                            OK := In_Character_Range (C);
12082
12083                            if OK then
12084                               Chr := Get_Character (C);
12085
12086                               --  Dot case
12087
12088                               if J < Len and then Chr = '.' then
12089                                  J := J + 1;
12090                                  C := Get_String_Char (Str, J);
12091                                  Chr := Get_Character (C);
12092
12093                                  if not Set_Dot_Warning_Switch (Chr) then
12094                                     Error_Pragma_Arg
12095                                       ("invalid warning switch character " &
12096                                        '.' & Chr, Arg1);
12097                                  end if;
12098
12099                               --  Non-Dot case
12100
12101                               else
12102                                  OK := Set_Warning_Switch (Chr);
12103                               end if;
12104                            end if;
12105
12106                            if not OK then
12107                               Error_Pragma_Arg
12108                                 ("invalid warning switch character " & Chr,
12109                                  Arg1);
12110                            end if;
12111
12112                            J := J + 1;
12113                         end loop;
12114                      end;
12115                   end if;
12116
12117                   --  Two or more arguments (must be two)
12118
12119                else
12120                   Check_Arg_Is_One_Of (Arg1, Name_On, Name_Off);
12121                   Check_At_Most_N_Arguments (2);
12122
12123                   declare
12124                      E_Id : Node_Id;
12125                      E    : Entity_Id;
12126                      Err  : Boolean;
12127
12128                   begin
12129                      E_Id := Expression (Arg2);
12130                      Analyze (E_Id);
12131
12132                      --  In the expansion of an inlined body, a reference to
12133                      --  the formal may be wrapped in a conversion if the
12134                      --  actual is a conversion. Retrieve the real entity name.
12135
12136                      if (In_Instance_Body
12137                          or else In_Inlined_Body)
12138                        and then Nkind (E_Id) = N_Unchecked_Type_Conversion
12139                      then
12140                         E_Id := Expression (E_Id);
12141                      end if;
12142
12143                      --  Entity name case
12144
12145                      if Is_Entity_Name (E_Id) then
12146                         E := Entity (E_Id);
12147
12148                         if E = Any_Id then
12149                            return;
12150                         else
12151                            loop
12152                               Set_Warnings_Off
12153                                 (E, (Chars (Expression (Arg1)) = Name_Off));
12154
12155                               if Chars (Expression (Arg1)) = Name_Off
12156                                 and then Warn_On_Warnings_Off
12157                               then
12158                                  Warnings_Off_Pragmas.Append ((N, E));
12159                               end if;
12160
12161                               if Is_Enumeration_Type (E) then
12162                                  declare
12163                                     Lit : Entity_Id;
12164                                  begin
12165                                     Lit := First_Literal (E);
12166                                     while Present (Lit) loop
12167                                        Set_Warnings_Off (Lit);
12168                                        Next_Literal (Lit);
12169                                     end loop;
12170                                  end;
12171                               end if;
12172
12173                               exit when No (Homonym (E));
12174                               E := Homonym (E);
12175                            end loop;
12176                         end if;
12177
12178                      --  Error if not entity or static string literal case
12179
12180                      elsif not Is_Static_String_Expression (Arg2) then
12181                         Error_Pragma_Arg
12182                           ("second argument of pragma% must be entity " &
12183                            "name or static string expression", Arg2);
12184
12185                      --  String literal case
12186
12187                      else
12188                         String_To_Name_Buffer
12189                           (Strval (Expr_Value_S (Expression (Arg2))));
12190
12191                         --  Note on configuration pragma case: If this is a
12192                         --  configuration pragma, then for an OFF pragma, we
12193                         --  just set Config True in the call, which is all
12194                         --  that needs to be done. For the case of ON, this
12195                         --  is normally an error, unless it is canceling the
12196                         --  effect of a previous OFF pragma in the same file.
12197                         --  In any other case, an error will be signalled (ON
12198                         --  with no matching OFF).
12199
12200                         if Chars (Argx) = Name_Off then
12201                            Set_Specific_Warning_Off
12202                              (Loc, Name_Buffer (1 .. Name_Len),
12203                               Config => Is_Configuration_Pragma);
12204
12205                         elsif Chars (Argx) = Name_On then
12206                            Set_Specific_Warning_On
12207                              (Loc, Name_Buffer (1 .. Name_Len), Err);
12208
12209                            if Err then
12210                               Error_Msg
12211                                 ("?pragma Warnings On with no " &
12212                                  "matching Warnings Off",
12213                                  Loc);
12214                            end if;
12215                         end if;
12216                      end if;
12217                   end;
12218                end if;
12219             end;
12220          end Warnings;
12221
12222          -------------------
12223          -- Weak_External --
12224          -------------------
12225
12226          --  pragma Weak_External ([Entity =>] LOCAL_NAME);
12227
12228          when Pragma_Weak_External => Weak_External : declare
12229             Ent : Entity_Id;
12230
12231          begin
12232             GNAT_Pragma;
12233             Check_Arg_Count (1);
12234             Check_Optional_Identifier (Arg1, Name_Entity);
12235             Check_Arg_Is_Library_Level_Local_Name (Arg1);
12236             Ent := Entity (Expression (Arg1));
12237
12238             if Rep_Item_Too_Early (Ent, N) then
12239                return;
12240             else
12241                Ent := Underlying_Type (Ent);
12242             end if;
12243
12244             --  The only processing required is to link this item on to the
12245             --  list of rep items for the given entity. This is accomplished
12246             --  by the call to Rep_Item_Too_Late (when no error is detected
12247             --  and False is returned).
12248
12249             if Rep_Item_Too_Late (Ent, N) then
12250                return;
12251             else
12252                Set_Has_Gigi_Rep_Item (Ent);
12253             end if;
12254          end Weak_External;
12255
12256          -----------------------------
12257          -- Wide_Character_Encoding --
12258          -----------------------------
12259
12260          --  pragma Wide_Character_Encoding (IDENTIFIER);
12261
12262          when Pragma_Wide_Character_Encoding =>
12263             GNAT_Pragma;
12264
12265             --  Nothing to do, handled in parser. Note that we do not enforce
12266             --  configuration pragma placement, this pragma can appear at any
12267             --  place in the source, allowing mixed encodings within a single
12268             --  source program.
12269
12270             null;
12271
12272          --------------------
12273          -- Unknown_Pragma --
12274          --------------------
12275
12276          --  Should be impossible, since the case of an unknown pragma is
12277          --  separately processed before the case statement is entered.
12278
12279          when Unknown_Pragma =>
12280             raise Program_Error;
12281       end case;
12282
12283    exception
12284       when Pragma_Exit => null;
12285    end Analyze_Pragma;
12286
12287    -------------------
12288    -- Check_Enabled --
12289    -------------------
12290
12291    function Check_Enabled (Nam : Name_Id) return Boolean is
12292       PP : Node_Id;
12293
12294    begin
12295       PP := Opt.Check_Policy_List;
12296       loop
12297          if No (PP) then
12298             return Assertions_Enabled;
12299
12300          elsif
12301            Nam = Chars (Expression (First (Pragma_Argument_Associations (PP))))
12302          then
12303             case
12304               Chars (Expression (Last (Pragma_Argument_Associations (PP))))
12305             is
12306             when Name_On | Name_Check =>
12307                return True;
12308             when Name_Off | Name_Ignore =>
12309                return False;
12310             when others =>
12311                raise Program_Error;
12312             end case;
12313
12314          else
12315             PP := Next_Pragma (PP);
12316          end if;
12317       end loop;
12318    end Check_Enabled;
12319
12320    ---------------------------------
12321    -- Delay_Config_Pragma_Analyze --
12322    ---------------------------------
12323
12324    function Delay_Config_Pragma_Analyze (N : Node_Id) return Boolean is
12325    begin
12326       return Pragma_Name (N) = Name_Interrupt_State
12327                or else
12328              Pragma_Name (N) = Name_Priority_Specific_Dispatching;
12329    end Delay_Config_Pragma_Analyze;
12330
12331    -------------------------
12332    -- Get_Base_Subprogram --
12333    -------------------------
12334
12335    function Get_Base_Subprogram (Def_Id : Entity_Id) return Entity_Id is
12336       Result : Entity_Id;
12337
12338    begin
12339       --  Follow subprogram renaming chain
12340
12341       Result := Def_Id;
12342       while Is_Subprogram (Result)
12343         and then
12344           (Is_Generic_Instance (Result)
12345             or else Nkind (Parent (Declaration_Node (Result))) =
12346                                          N_Subprogram_Renaming_Declaration)
12347         and then Present (Alias (Result))
12348       loop
12349          Result := Alias (Result);
12350       end loop;
12351
12352       return Result;
12353    end Get_Base_Subprogram;
12354
12355    --------------------
12356    -- Get_Pragma_Arg --
12357    --------------------
12358
12359    function Get_Pragma_Arg (Arg : Node_Id) return Node_Id is
12360    begin
12361       if Nkind (Arg) = N_Pragma_Argument_Association then
12362          return Expression (Arg);
12363       else
12364          return Arg;
12365       end if;
12366    end Get_Pragma_Arg;
12367
12368    ----------------
12369    -- Initialize --
12370    ----------------
12371
12372    procedure Initialize is
12373    begin
12374       Externals.Init;
12375    end Initialize;
12376
12377    -----------------------------
12378    -- Is_Config_Static_String --
12379    -----------------------------
12380
12381    function Is_Config_Static_String (Arg : Node_Id) return Boolean is
12382
12383       function Add_Config_Static_String (Arg : Node_Id) return Boolean;
12384       --  This is an internal recursive function that is just like the outer
12385       --  function except that it adds the string to the name buffer rather
12386       --  than placing the string in the name buffer.
12387
12388       ------------------------------
12389       -- Add_Config_Static_String --
12390       ------------------------------
12391
12392       function Add_Config_Static_String (Arg : Node_Id) return Boolean is
12393          N : Node_Id;
12394          C : Char_Code;
12395
12396       begin
12397          N := Arg;
12398
12399          if Nkind (N) = N_Op_Concat then
12400             if Add_Config_Static_String (Left_Opnd (N)) then
12401                N := Right_Opnd (N);
12402             else
12403                return False;
12404             end if;
12405          end if;
12406
12407          if Nkind (N) /= N_String_Literal then
12408             Error_Msg_N ("string literal expected for pragma argument", N);
12409             return False;
12410
12411          else
12412             for J in 1 .. String_Length (Strval (N)) loop
12413                C := Get_String_Char (Strval (N), J);
12414
12415                if not In_Character_Range (C) then
12416                   Error_Msg
12417                     ("string literal contains invalid wide character",
12418                      Sloc (N) + 1 + Source_Ptr (J));
12419                   return False;
12420                end if;
12421
12422                Add_Char_To_Name_Buffer (Get_Character (C));
12423             end loop;
12424          end if;
12425
12426          return True;
12427       end Add_Config_Static_String;
12428
12429    --  Start of processing for Is_Config_Static_String
12430
12431    begin
12432
12433       Name_Len := 0;
12434       return Add_Config_Static_String (Arg);
12435    end Is_Config_Static_String;
12436
12437    -----------------------------------------
12438    -- Is_Non_Significant_Pragma_Reference --
12439    -----------------------------------------
12440
12441    --  This function makes use of the following static table which indicates
12442    --  whether a given pragma is significant. A value of -1 in this table
12443    --  indicates that the reference is significant. A value of zero indicates
12444    --  than appearance as any argument is insignificant, a positive value
12445    --  indicates that appearance in that parameter position is significant.
12446
12447    --  A value of 99 flags a special case requiring a special check (this is
12448    --  used for cases not covered by this standard encoding, e.g. pragma Check
12449    --  where the first argument is not significant, but the others are).
12450
12451    Sig_Flags : constant array (Pragma_Id) of Int :=
12452      (Pragma_AST_Entry                     => -1,
12453       Pragma_Abort_Defer                   => -1,
12454       Pragma_Ada_83                        => -1,
12455       Pragma_Ada_95                        => -1,
12456       Pragma_Ada_05                        => -1,
12457       Pragma_Ada_2005                      => -1,
12458       Pragma_All_Calls_Remote              => -1,
12459       Pragma_Annotate                      => -1,
12460       Pragma_Assert                        => -1,
12461       Pragma_Assertion_Policy              =>  0,
12462       Pragma_Assume_No_Invalid_Values      =>  0,
12463       Pragma_Asynchronous                  => -1,
12464       Pragma_Atomic                        =>  0,
12465       Pragma_Atomic_Components             =>  0,
12466       Pragma_Attach_Handler                => -1,
12467       Pragma_Check                         => 99,
12468       Pragma_Check_Name                    =>  0,
12469       Pragma_Check_Policy                  =>  0,
12470       Pragma_CIL_Constructor               => -1,
12471       Pragma_CPP_Class                     =>  0,
12472       Pragma_CPP_Constructor               =>  0,
12473       Pragma_CPP_Virtual                   =>  0,
12474       Pragma_CPP_Vtable                    =>  0,
12475       Pragma_C_Pass_By_Copy                =>  0,
12476       Pragma_Comment                       =>  0,
12477       Pragma_Common_Object                 => -1,
12478       Pragma_Compile_Time_Error            => -1,
12479       Pragma_Compile_Time_Warning          => -1,
12480       Pragma_Compiler_Unit                 =>  0,
12481       Pragma_Complete_Representation       =>  0,
12482       Pragma_Complex_Representation        =>  0,
12483       Pragma_Component_Alignment           => -1,
12484       Pragma_Controlled                    =>  0,
12485       Pragma_Convention                    =>  0,
12486       Pragma_Convention_Identifier         =>  0,
12487       Pragma_Debug                         => -1,
12488       Pragma_Debug_Policy                  =>  0,
12489       Pragma_Detect_Blocking               => -1,
12490       Pragma_Discard_Names                 =>  0,
12491       Pragma_Elaborate                     => -1,
12492       Pragma_Elaborate_All                 => -1,
12493       Pragma_Elaborate_Body                => -1,
12494       Pragma_Elaboration_Checks            => -1,
12495       Pragma_Eliminate                     => -1,
12496       Pragma_Export                        => -1,
12497       Pragma_Export_Exception              => -1,
12498       Pragma_Export_Function               => -1,
12499       Pragma_Export_Object                 => -1,
12500       Pragma_Export_Procedure              => -1,
12501       Pragma_Export_Value                  => -1,
12502       Pragma_Export_Valued_Procedure       => -1,
12503       Pragma_Extend_System                 => -1,
12504       Pragma_Extensions_Allowed            => -1,
12505       Pragma_External                      => -1,
12506       Pragma_Favor_Top_Level               => -1,
12507       Pragma_External_Name_Casing          => -1,
12508       Pragma_Fast_Math                     => -1,
12509       Pragma_Finalize_Storage_Only         =>  0,
12510       Pragma_Float_Representation          =>  0,
12511       Pragma_Ident                         => -1,
12512       Pragma_Implemented_By_Entry          => -1,
12513       Pragma_Implicit_Packing              =>  0,
12514       Pragma_Import                        => +2,
12515       Pragma_Import_Exception              =>  0,
12516       Pragma_Import_Function               =>  0,
12517       Pragma_Import_Object                 =>  0,
12518       Pragma_Import_Procedure              =>  0,
12519       Pragma_Import_Valued_Procedure       =>  0,
12520       Pragma_Initialize_Scalars            => -1,
12521       Pragma_Inline                        =>  0,
12522       Pragma_Inline_Always                 =>  0,
12523       Pragma_Inline_Generic                =>  0,
12524       Pragma_Inspection_Point              => -1,
12525       Pragma_Interface                     => +2,
12526       Pragma_Interface_Name                => +2,
12527       Pragma_Interrupt_Handler             => -1,
12528       Pragma_Interrupt_Priority            => -1,
12529       Pragma_Interrupt_State               => -1,
12530       Pragma_Java_Constructor              => -1,
12531       Pragma_Java_Interface                => -1,
12532       Pragma_Keep_Names                    =>  0,
12533       Pragma_License                       => -1,
12534       Pragma_Link_With                     => -1,
12535       Pragma_Linker_Alias                  => -1,
12536       Pragma_Linker_Constructor            => -1,
12537       Pragma_Linker_Destructor             => -1,
12538       Pragma_Linker_Options                => -1,
12539       Pragma_Linker_Section                => -1,
12540       Pragma_List                          => -1,
12541       Pragma_Locking_Policy                => -1,
12542       Pragma_Long_Float                    => -1,
12543       Pragma_Machine_Attribute             => -1,
12544       Pragma_Main                          => -1,
12545       Pragma_Main_Storage                  => -1,
12546       Pragma_Memory_Size                   => -1,
12547       Pragma_No_Return                     =>  0,
12548       Pragma_No_Body                       =>  0,
12549       Pragma_No_Run_Time                   => -1,
12550       Pragma_No_Strict_Aliasing            => -1,
12551       Pragma_Normalize_Scalars             => -1,
12552       Pragma_Obsolescent                   =>  0,
12553       Pragma_Optimize                      => -1,
12554       Pragma_Optimize_Alignment            => -1,
12555       Pragma_Pack                          =>  0,
12556       Pragma_Page                          => -1,
12557       Pragma_Passive                       => -1,
12558       Pragma_Preelaborable_Initialization  => -1,
12559       Pragma_Polling                       => -1,
12560       Pragma_Persistent_BSS                =>  0,
12561       Pragma_Postcondition                 => -1,
12562       Pragma_Precondition                  => -1,
12563       Pragma_Preelaborate                  => -1,
12564       Pragma_Preelaborate_05               => -1,
12565       Pragma_Priority                      => -1,
12566       Pragma_Priority_Specific_Dispatching => -1,
12567       Pragma_Profile                       =>  0,
12568       Pragma_Profile_Warnings              =>  0,
12569       Pragma_Propagate_Exceptions          => -1,
12570       Pragma_Psect_Object                  => -1,
12571       Pragma_Pure                          => -1,
12572       Pragma_Pure_05                       => -1,
12573       Pragma_Pure_Function                 => -1,
12574       Pragma_Queuing_Policy                => -1,
12575       Pragma_Ravenscar                     => -1,
12576       Pragma_Relative_Deadline             => -1,
12577       Pragma_Remote_Call_Interface         => -1,
12578       Pragma_Remote_Types                  => -1,
12579       Pragma_Restricted_Run_Time           => -1,
12580       Pragma_Restriction_Warnings          => -1,
12581       Pragma_Restrictions                  => -1,
12582       Pragma_Reviewable                    => -1,
12583       Pragma_Short_Circuit_And_Or          => -1,
12584       Pragma_Share_Generic                 => -1,
12585       Pragma_Shared                        => -1,
12586       Pragma_Shared_Passive                => -1,
12587       Pragma_Source_File_Name              => -1,
12588       Pragma_Source_File_Name_Project      => -1,
12589       Pragma_Source_Reference              => -1,
12590       Pragma_Storage_Size                  => -1,
12591       Pragma_Storage_Unit                  => -1,
12592       Pragma_Static_Elaboration_Desired    => -1,
12593       Pragma_Stream_Convert                => -1,
12594       Pragma_Style_Checks                  => -1,
12595       Pragma_Subtitle                      => -1,
12596       Pragma_Suppress                      =>  0,
12597       Pragma_Suppress_Exception_Locations  =>  0,
12598       Pragma_Suppress_All                  => -1,
12599       Pragma_Suppress_Debug_Info           =>  0,
12600       Pragma_Suppress_Initialization       =>  0,
12601       Pragma_System_Name                   => -1,
12602       Pragma_Task_Dispatching_Policy       => -1,
12603       Pragma_Task_Info                     => -1,
12604       Pragma_Task_Name                     => -1,
12605       Pragma_Task_Storage                  =>  0,
12606       Pragma_Thread_Local_Storage          =>  0,
12607       Pragma_Time_Slice                    => -1,
12608       Pragma_Title                         => -1,
12609       Pragma_Unchecked_Union               =>  0,
12610       Pragma_Unimplemented_Unit            => -1,
12611       Pragma_Universal_Aliasing            => -1,
12612       Pragma_Universal_Data                => -1,
12613       Pragma_Unmodified                    => -1,
12614       Pragma_Unreferenced                  => -1,
12615       Pragma_Unreferenced_Objects          => -1,
12616       Pragma_Unreserve_All_Interrupts      => -1,
12617       Pragma_Unsuppress                    =>  0,
12618       Pragma_Use_VADS_Size                 => -1,
12619       Pragma_Validity_Checks               => -1,
12620       Pragma_Volatile                      =>  0,
12621       Pragma_Volatile_Components           =>  0,
12622       Pragma_Warnings                      => -1,
12623       Pragma_Weak_External                 => -1,
12624       Pragma_Wide_Character_Encoding       =>  0,
12625       Unknown_Pragma                       =>  0);
12626
12627    function Is_Non_Significant_Pragma_Reference (N : Node_Id) return Boolean is
12628       Id : Pragma_Id;
12629       P  : Node_Id;
12630       C  : Int;
12631       A  : Node_Id;
12632
12633    begin
12634       P := Parent (N);
12635
12636       if Nkind (P) /= N_Pragma_Argument_Association then
12637          return False;
12638
12639       else
12640          Id := Get_Pragma_Id (Parent (P));
12641          C := Sig_Flags (Id);
12642
12643          case C is
12644             when -1 =>
12645                return False;
12646
12647             when 0 =>
12648                return True;
12649
12650             when 99 =>
12651                case Id is
12652
12653                   --  For pragma Check, the first argument is not significant,
12654                   --  the second and the third (if present) arguments are
12655                   --  significant.
12656
12657                   when Pragma_Check =>
12658                      return
12659                        P = First (Pragma_Argument_Associations (Parent (P)));
12660
12661                   when others =>
12662                      raise Program_Error;
12663                end case;
12664
12665             when others =>
12666                A := First (Pragma_Argument_Associations (Parent (P)));
12667                for J in 1 .. C - 1 loop
12668                   if No (A) then
12669                      return False;
12670                   end if;
12671
12672                   Next (A);
12673                end loop;
12674
12675                return A = P; -- is this wrong way round ???
12676          end case;
12677       end if;
12678    end Is_Non_Significant_Pragma_Reference;
12679
12680    ------------------------------
12681    -- Is_Pragma_String_Literal --
12682    ------------------------------
12683
12684    --  This function returns true if the corresponding pragma argument is a
12685    --  static string expression. These are the only cases in which string
12686    --  literals can appear as pragma arguments. We also allow a string literal
12687    --  as the first argument to pragma Assert (although it will of course
12688    --  always generate a type error).
12689
12690    function Is_Pragma_String_Literal (Par : Node_Id) return Boolean is
12691       Pragn : constant Node_Id := Parent (Par);
12692       Assoc : constant List_Id := Pragma_Argument_Associations (Pragn);
12693       Pname : constant Name_Id := Pragma_Name (Pragn);
12694       Argn  : Natural;
12695       N     : Node_Id;
12696
12697    begin
12698       Argn := 1;
12699       N := First (Assoc);
12700       loop
12701          exit when N = Par;
12702          Argn := Argn + 1;
12703          Next (N);
12704       end loop;
12705
12706       if Pname = Name_Assert then
12707          return True;
12708
12709       elsif Pname = Name_Export then
12710          return Argn > 2;
12711
12712       elsif Pname = Name_Ident then
12713          return Argn = 1;
12714
12715       elsif Pname = Name_Import then
12716          return Argn > 2;
12717
12718       elsif Pname = Name_Interface_Name then
12719          return Argn > 1;
12720
12721       elsif Pname = Name_Linker_Alias then
12722          return Argn = 2;
12723
12724       elsif Pname = Name_Linker_Section then
12725          return Argn = 2;
12726
12727       elsif Pname = Name_Machine_Attribute then
12728          return Argn = 2;
12729
12730       elsif Pname = Name_Source_File_Name then
12731          return True;
12732
12733       elsif Pname = Name_Source_Reference then
12734          return Argn = 2;
12735
12736       elsif Pname = Name_Title then
12737          return True;
12738
12739       elsif Pname = Name_Subtitle then
12740          return True;
12741
12742       else
12743          return False;
12744       end if;
12745    end Is_Pragma_String_Literal;
12746
12747    --------------------------------------
12748    -- Process_Compilation_Unit_Pragmas --
12749    --------------------------------------
12750
12751    procedure Process_Compilation_Unit_Pragmas (N : Node_Id) is
12752    begin
12753       --  A special check for pragma Suppress_All, a very strange DEC pragma,
12754       --  strange because it comes at the end of the unit. If we have a pragma
12755       --  Suppress_All in the Pragmas_After of the current unit, then we insert
12756       --  a pragma Suppress (All_Checks) at the start of the context clause to
12757       --  ensure the correct processing.
12758
12759       declare
12760          PA : constant List_Id := Pragmas_After (Aux_Decls_Node (N));
12761          P  : Node_Id;
12762
12763       begin
12764          if Present (PA) then
12765             P := First (PA);
12766             while Present (P) loop
12767                if Pragma_Name (P) = Name_Suppress_All then
12768                   Prepend_To (Context_Items (N),
12769                     Make_Pragma (Sloc (P),
12770                       Chars => Name_Suppress,
12771                       Pragma_Argument_Associations => New_List (
12772                         Make_Pragma_Argument_Association (Sloc (P),
12773                           Expression =>
12774                             Make_Identifier (Sloc (P),
12775                               Chars => Name_All_Checks)))));
12776                   exit;
12777                end if;
12778
12779                Next (P);
12780             end loop;
12781          end if;
12782       end;
12783    end Process_Compilation_Unit_Pragmas;
12784
12785    --------
12786    -- rv --
12787    --------
12788
12789    procedure rv is
12790    begin
12791       null;
12792    end rv;
12793
12794    --------------------------------
12795    -- Set_Encoded_Interface_Name --
12796    --------------------------------
12797
12798    procedure Set_Encoded_Interface_Name (E : Entity_Id; S : Node_Id) is
12799       Str : constant String_Id := Strval (S);
12800       Len : constant Int       := String_Length (Str);
12801       CC  : Char_Code;
12802       C   : Character;
12803       J   : Int;
12804
12805       Hex : constant array (0 .. 15) of Character := "0123456789abcdef";
12806
12807       procedure Encode;
12808       --  Stores encoded value of character code CC. The encoding we use an
12809       --  underscore followed by four lower case hex digits.
12810
12811       ------------
12812       -- Encode --
12813       ------------
12814
12815       procedure Encode is
12816       begin
12817          Store_String_Char (Get_Char_Code ('_'));
12818          Store_String_Char
12819            (Get_Char_Code (Hex (Integer (CC / 2 ** 12))));
12820          Store_String_Char
12821            (Get_Char_Code (Hex (Integer (CC / 2 ** 8 and 16#0F#))));
12822          Store_String_Char
12823            (Get_Char_Code (Hex (Integer (CC / 2 ** 4 and 16#0F#))));
12824          Store_String_Char
12825            (Get_Char_Code (Hex (Integer (CC and 16#0F#))));
12826       end Encode;
12827
12828    --  Start of processing for Set_Encoded_Interface_Name
12829
12830    begin
12831       --  If first character is asterisk, this is a link name, and we leave it
12832       --  completely unmodified. We also ignore null strings (the latter case
12833       --  happens only in error cases) and no encoding should occur for Java or
12834       --  AAMP interface names.
12835
12836       if Len = 0
12837         or else Get_String_Char (Str, 1) = Get_Char_Code ('*')
12838         or else VM_Target /= No_VM
12839         or else AAMP_On_Target
12840       then
12841          Set_Interface_Name (E, S);
12842
12843       else
12844          J := 1;
12845          loop
12846             CC := Get_String_Char (Str, J);
12847
12848             exit when not In_Character_Range (CC);
12849
12850             C := Get_Character (CC);
12851
12852             exit when C /= '_' and then C /= '$'
12853               and then C not in '0' .. '9'
12854               and then C not in 'a' .. 'z'
12855               and then C not in 'A' .. 'Z';
12856
12857             if J = Len then
12858                Set_Interface_Name (E, S);
12859                return;
12860
12861             else
12862                J := J + 1;
12863             end if;
12864          end loop;
12865
12866          --  Here we need to encode. The encoding we use as follows:
12867          --     three underscores  + four hex digits (lower case)
12868
12869          Start_String;
12870
12871          for J in 1 .. String_Length (Str) loop
12872             CC := Get_String_Char (Str, J);
12873
12874             if not In_Character_Range (CC) then
12875                Encode;
12876             else
12877                C := Get_Character (CC);
12878
12879                if C = '_' or else C = '$'
12880                  or else C in '0' .. '9'
12881                  or else C in 'a' .. 'z'
12882                  or else C in 'A' .. 'Z'
12883                then
12884                   Store_String_Char (CC);
12885                else
12886                   Encode;
12887                end if;
12888             end if;
12889          end loop;
12890
12891          Set_Interface_Name (E,
12892            Make_String_Literal (Sloc (S),
12893              Strval => End_String));
12894       end if;
12895    end Set_Encoded_Interface_Name;
12896
12897    -------------------
12898    -- Set_Unit_Name --
12899    -------------------
12900
12901    procedure Set_Unit_Name (N : Node_Id; With_Item : Node_Id) is
12902       Pref : Node_Id;
12903       Scop : Entity_Id;
12904
12905    begin
12906       if Nkind (N) = N_Identifier
12907         and then Nkind (With_Item) = N_Identifier
12908       then
12909          Set_Entity (N, Entity (With_Item));
12910
12911       elsif Nkind (N) = N_Selected_Component then
12912          Change_Selected_Component_To_Expanded_Name (N);
12913          Set_Entity (N, Entity (With_Item));
12914          Set_Entity (Selector_Name (N), Entity (N));
12915
12916          Pref := Prefix (N);
12917          Scop := Scope (Entity (N));
12918          while Nkind (Pref) = N_Selected_Component loop
12919             Change_Selected_Component_To_Expanded_Name (Pref);
12920             Set_Entity (Selector_Name (Pref), Scop);
12921             Set_Entity (Pref, Scop);
12922             Pref := Prefix (Pref);
12923             Scop := Scope (Scop);
12924          end loop;
12925
12926          Set_Entity (Pref, Scop);
12927       end if;
12928    end Set_Unit_Name;
12929
12930 end Sem_Prag;