summaryrefslogtreecommitdiff
path: root/gcc/ada/exp_prag.adb
blob: 7e1f4208b3fa4ad4648aa31c64821d783762f69b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
------------------------------------------------------------------------------
--                                                                          --
--                         GNAT COMPILER COMPONENTS                         --
--                                                                          --
--                             E X P _ P R A G                              --
--                                                                          --
--                                 B o d y                                  --
--                                                                          --
--          Copyright (C) 1992-2010, Free Software Foundation, Inc.         --
--                                                                          --
-- GNAT is free software;  you can  redistribute it  and/or modify it under --
-- terms of the  GNU General Public License as published  by the Free Soft- --
-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
-- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
-- for  more details.  You should have  received  a copy of the GNU General --
-- Public License  distributed with GNAT; see file COPYING3.  If not, go to --
-- http://www.gnu.org/licenses for a complete copy of the license.          --
--                                                                          --
-- GNAT was originally developed  by the GNAT team at  New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc.      --
--                                                                          --
------------------------------------------------------------------------------

with Atree;    use Atree;
with Casing;   use Casing;
with Debug;    use Debug;
with Einfo;    use Einfo;
with Errout;   use Errout;
with Exp_Ch11; use Exp_Ch11;
with Exp_Util; use Exp_Util;
with Expander; use Expander;
with Namet;    use Namet;
with Nlists;   use Nlists;
with Nmake;    use Nmake;
with Opt;      use Opt;
with Restrict; use Restrict;
with Rident;   use Rident;
with Rtsfind;  use Rtsfind;
with Sem;      use Sem;
with Sem_Res;  use Sem_Res;
with Sem_Util; use Sem_Util;
with Sinfo;    use Sinfo;
with Sinput;   use Sinput;
with Snames;   use Snames;
with Stringt;  use Stringt;
with Stand;    use Stand;
with Targparm; use Targparm;
with Tbuild;   use Tbuild;
with Uintp;    use Uintp;

package body Exp_Prag is

   -----------------------
   -- Local Subprograms --
   -----------------------

   function Arg1 (N : Node_Id) return Node_Id;
   function Arg2 (N : Node_Id) return Node_Id;
   function Arg3 (N : Node_Id) return Node_Id;
   --  Obtain specified pragma argument expression

   procedure Expand_Pragma_Abort_Defer             (N : Node_Id);
   procedure Expand_Pragma_Check                   (N : Node_Id);
   procedure Expand_Pragma_Common_Object           (N : Node_Id);
   procedure Expand_Pragma_Import_Or_Interface     (N : Node_Id);
   procedure Expand_Pragma_Import_Export_Exception (N : Node_Id);
   procedure Expand_Pragma_Inspection_Point        (N : Node_Id);
   procedure Expand_Pragma_Interrupt_Priority      (N : Node_Id);
   procedure Expand_Pragma_Psect_Object            (N : Node_Id);
   procedure Expand_Pragma_Relative_Deadline       (N : Node_Id);

   ----------
   -- Arg1 --
   ----------

   function Arg1 (N : Node_Id) return Node_Id is
      Arg : constant Node_Id := First (Pragma_Argument_Associations (N));
   begin
      if Present (Arg)
        and then Nkind (Arg) = N_Pragma_Argument_Association
      then
         return Expression (Arg);
      else
         return Arg;
      end if;
   end Arg1;

   ----------
   -- Arg2 --
   ----------

   function Arg2 (N : Node_Id) return Node_Id is
      Arg1 : constant Node_Id := First (Pragma_Argument_Associations (N));

   begin
      if No (Arg1) then
         return Empty;

      else
         declare
            Arg : constant Node_Id := Next (Arg1);
         begin
            if Present (Arg)
              and then Nkind (Arg) = N_Pragma_Argument_Association
            then
               return Expression (Arg);
            else
               return Arg;
            end if;
         end;
      end if;
   end Arg2;

   ----------
   -- Arg3 --
   ----------

   function Arg3 (N : Node_Id) return Node_Id is
      Arg1 : constant Node_Id := First (Pragma_Argument_Associations (N));

   begin
      if No (Arg1) then
         return Empty;

      else
         declare
            Arg : Node_Id := Next (Arg1);
         begin
            if No (Arg) then
               return Empty;

            else
               Next (Arg);

               if Present (Arg)
                 and then Nkind (Arg) = N_Pragma_Argument_Association
               then
                  return Expression (Arg);
               else
                  return Arg;
               end if;
            end if;
         end;
      end if;
   end Arg3;

   ---------------------
   -- Expand_N_Pragma --
   ---------------------

   procedure Expand_N_Pragma (N : Node_Id) is
      Pname : constant Name_Id := Pragma_Name (N);

   begin
      --  Note: we may have a pragma whose Pragma_Identifier field is not a
      --  recognized pragma, and we must ignore it at this stage.

      if Is_Pragma_Name (Pname) then
         case Get_Pragma_Id (Pname) is

            --  Pragmas requiring special expander action

            when Pragma_Abort_Defer =>
               Expand_Pragma_Abort_Defer (N);

            when Pragma_Check =>
               Expand_Pragma_Check (N);

            when Pragma_Common_Object =>
               Expand_Pragma_Common_Object (N);

            when Pragma_Export_Exception =>
               Expand_Pragma_Import_Export_Exception (N);

            when Pragma_Import =>
               Expand_Pragma_Import_Or_Interface (N);

            when Pragma_Import_Exception =>
               Expand_Pragma_Import_Export_Exception (N);

            when Pragma_Inspection_Point =>
               Expand_Pragma_Inspection_Point (N);

            when Pragma_Interface =>
               Expand_Pragma_Import_Or_Interface (N);

            when Pragma_Interrupt_Priority =>
               Expand_Pragma_Interrupt_Priority (N);

            when Pragma_Psect_Object =>
               Expand_Pragma_Psect_Object (N);

            when Pragma_Relative_Deadline =>
               Expand_Pragma_Relative_Deadline (N);

            --  All other pragmas need no expander action

            when others => null;
         end case;
      end if;

   end Expand_N_Pragma;

   -------------------------------
   -- Expand_Pragma_Abort_Defer --
   -------------------------------

   --  An Abort_Defer pragma appears as the first statement in a handled
   --  statement sequence (right after the begin). It defers aborts for
   --  the entire statement sequence, but not for any declarations or
   --  handlers (if any) associated with this statement sequence.

   --  The transformation is to transform

   --    pragma Abort_Defer;
   --    statements;

   --  into

   --    begin
   --       Abort_Defer.all;
   --       statements
   --    exception
   --       when all others =>
   --          Abort_Undefer.all;
   --          raise;
   --    at end
   --       Abort_Undefer_Direct;
   --    end;

   procedure Expand_Pragma_Abort_Defer (N : Node_Id) is
      Loc  : constant Source_Ptr := Sloc (N);
      Stm  : Node_Id;
      Stms : List_Id;
      HSS  : Node_Id;
      Blk  : constant Entity_Id :=
        New_Internal_Entity (E_Block, Current_Scope, Sloc (N), 'B');

   begin
      Stms := New_List (Build_Runtime_Call (Loc, RE_Abort_Defer));

      loop
         Stm := Remove_Next (N);
         exit when No (Stm);
         Append (Stm, Stms);
      end loop;

      HSS :=
        Make_Handled_Sequence_Of_Statements (Loc,
          Statements => Stms,
          At_End_Proc =>
            New_Occurrence_Of (RTE (RE_Abort_Undefer_Direct), Loc));

      Rewrite (N,
        Make_Block_Statement (Loc,
          Handled_Statement_Sequence => HSS));

      Set_Scope (Blk, Current_Scope);
      Set_Etype (Blk, Standard_Void_Type);
      Set_Identifier (N, New_Occurrence_Of (Blk, Sloc (N)));
      Expand_At_End_Handler (HSS, Blk);
      Analyze (N);
   end Expand_Pragma_Abort_Defer;

   --------------------------
   -- Expand_Pragma_Check --
   --------------------------

   procedure Expand_Pragma_Check (N : Node_Id) is
      Cond : constant Node_Id    := Arg2 (N);
      Loc  : constant Source_Ptr := Sloc (Cond);
      Nam  : constant Name_Id    := Chars (Arg1 (N));
      Msg  : Node_Id;

   begin
      --  We already know that this check is enabled, because otherwise the
      --  semantic pass dealt with rewriting the assertion (see Sem_Prag)

      --  Since this check is enabled, we rewrite the pragma into a
      --  corresponding if statement, and then analyze the statement

      --  The normal case expansion transforms:

      --    pragma Check (name, condition [,message]);

      --  into

      --    if not condition then
      --       System.Assertions.Raise_Assert_Failure (Str);
      --    end if;

      --  where Str is the message if one is present, or the default of
      --  name failed at file:line if no message is given (the "name failed
      --  at" is omitted for name = Assertion, since it is redundant, given
      --  that the name of the exception is Assert_Failure.)

      --  An alternative expansion is used when the No_Exception_Propagation
      --  restriction is active and there is a local Assert_Failure handler.
      --  This is not a common combination of circumstances, but it occurs in
      --  the context of Aunit and the zero footprint profile. In this case we
      --  generate:

      --    if not condition then
      --       raise Assert_Failure;
      --    end if;

      --  This will then be transformed into a goto, and the local handler will
      --  be able to handle the assert error (which would not be the case if a
      --  call is made to the Raise_Assert_Failure procedure).

      --  We also generate the direct raise if the Suppress_Exception_Locations
      --  is active, since we don't want to generate messages in this case.

      --  Note that the reason we do not always generate a direct raise is that
      --  the form in which the procedure is called allows for more efficient
      --  breakpointing of assertion errors.

      --  Generate the appropriate if statement. Note that we consider this to
      --  be an explicit conditional in the source, not an implicit if, so we
      --  do not call Make_Implicit_If_Statement.

      --  Case where we generate a direct raise

      if ((Debug_Flag_Dot_G
           or else Restriction_Active (No_Exception_Propagation))
          and then Present (Find_Local_Handler (RTE (RE_Assert_Failure), N)))
        or else (Opt.Exception_Locations_Suppressed and then No (Arg3 (N)))
      then
         Rewrite (N,
           Make_If_Statement (Loc,
             Condition =>
               Make_Op_Not (Loc,
                 Right_Opnd => Cond),
             Then_Statements => New_List (
               Make_Raise_Statement (Loc,
                 Name =>
                   New_Reference_To (RTE (RE_Assert_Failure), Loc)))));

      --  Case where we call the procedure

      else
         --  If we have a message given, use it

         if Present (Arg3 (N)) then
            Msg := Get_Pragma_Arg (Arg3 (N));

         --  Here we have no string, so prepare one

         else
            declare
               Msg_Loc : constant String := Build_Location_String (Loc);

            begin
               Name_Len := 0;

               --  For Assert, we just use the location

               if Nam = Name_Assertion then
                  null;

               --  For predicate, we generate the string "predicate failed
               --  at yyy". We prefer all lower case for predicate.

               elsif Nam = Name_Predicate then
                  Add_Str_To_Name_Buffer ("predicate failed at ");

               --  For special case of Precondition/Postcondition the string is
               --  "failed xx from yy" where xx is precondition/postcondition
               --  in all lower case. The reason for this different wording is
               --  that the failure is not at the point of occurrence of the
               --  pragma, unlike the other Check cases.

               elsif Nam = Name_Precondition
                       or else
                     Nam = Name_Postcondition
               then
                  Get_Name_String (Nam);
                  Insert_Str_In_Name_Buffer ("failed ", 1);
                  Add_Str_To_Name_Buffer (" from ");

               --  For all other checks, the string is "xxx failed at yyy"
               --  where xxx is the check name with current source file casing.

               else
                  Get_Name_String (Nam);
                  Set_Casing (Identifier_Casing (Current_Source_File));
                  Add_Str_To_Name_Buffer (" failed at ");
               end if;

               --  In all cases, add location string

               Add_Str_To_Name_Buffer (Msg_Loc);

               --  Build the message

               Msg := Make_String_Literal (Loc, Name_Buffer (1 .. Name_Len));
            end;
         end if;

         --  Now rewrite as an if statement

         Rewrite (N,
           Make_If_Statement (Loc,
             Condition =>
               Make_Op_Not (Loc,
                 Right_Opnd => Cond),
             Then_Statements => New_List (
               Make_Procedure_Call_Statement (Loc,
                 Name =>
                   New_Reference_To (RTE (RE_Raise_Assert_Failure), Loc),
                 Parameter_Associations => New_List (Relocate_Node (Msg))))));
      end if;

      Analyze (N);

      --  If new condition is always false, give a warning

      if Warn_On_Assertion_Failure
        and then Nkind (N) = N_Procedure_Call_Statement
        and then Is_RTE (Entity (Name (N)), RE_Raise_Assert_Failure)
      then
         --  If original condition was a Standard.False, we assume that this is
         --  indeed intended to raise assert error and no warning is required.

         if Is_Entity_Name (Original_Node (Cond))
           and then Entity (Original_Node (Cond)) = Standard_False
         then
            return;
         elsif Nam = Name_Assertion then
            Error_Msg_N ("?assertion will fail at run time", N);
         else
            Error_Msg_N ("?check will fail at run time", N);
         end if;
      end if;
   end Expand_Pragma_Check;

   ---------------------------------
   -- Expand_Pragma_Common_Object --
   ---------------------------------

   --  Use a machine attribute to replicate semantic effect in DEC Ada

   --    pragma Machine_Attribute (intern_name, "common_object", extern_name);

   --  For now we do nothing with the size attribute ???

   --  Note: Psect_Object shares this processing

   procedure Expand_Pragma_Common_Object (N : Node_Id) is
      Loc : constant Source_Ptr := Sloc (N);

      Internal : constant Node_Id := Arg1 (N);
      External : constant Node_Id := Arg2 (N);

      Psect : Node_Id;
      --  Psect value upper cased as string literal

      Iloc : constant Source_Ptr := Sloc (Internal);
      Eloc : constant Source_Ptr := Sloc (External);
      Ploc : Source_Ptr;

   begin
      --  Acquire Psect value and fold to upper case

      if Present (External) then
         if Nkind (External) = N_String_Literal then
            String_To_Name_Buffer (Strval (External));
         else
            Get_Name_String (Chars (External));
         end if;

         Set_All_Upper_Case;

         Psect :=
           Make_String_Literal (Eloc,
             Strval => String_From_Name_Buffer);

      else
         Get_Name_String (Chars (Internal));
         Set_All_Upper_Case;
         Psect :=
           Make_String_Literal (Iloc,
             Strval => String_From_Name_Buffer);
      end if;

      Ploc := Sloc (Psect);

      --  Insert the pragma

      Insert_After_And_Analyze (N,
         Make_Pragma (Loc,
           Chars => Name_Machine_Attribute,
           Pragma_Argument_Associations => New_List (
             Make_Pragma_Argument_Association (Iloc,
               Expression => New_Copy_Tree (Internal)),
             Make_Pragma_Argument_Association (Eloc,
               Expression =>
                 Make_String_Literal (Sloc => Ploc,
                   Strval => "common_object")),
             Make_Pragma_Argument_Association (Ploc,
               Expression => New_Copy_Tree (Psect)))));

   end Expand_Pragma_Common_Object;

   ---------------------------------------
   -- Expand_Pragma_Import_Or_Interface --
   ---------------------------------------

   --  When applied to a variable, the default initialization must not be
   --  done. As it is already done when the pragma is found, we just get rid
   --  of the call the initialization procedure which followed the object
   --  declaration. The call is inserted after the declaration, but validity
   --  checks may also have been inserted and the initialization call does
   --  not necessarily appear immediately after the object declaration.

   --  We can't use the freezing mechanism for this purpose, since we
   --  have to elaborate the initialization expression when it is first
   --  seen (i.e. this elaboration cannot be deferred to the freeze point).

   procedure Expand_Pragma_Import_Or_Interface (N : Node_Id) is
      Def_Id    : constant Entity_Id := Entity (Arg2 (N));
      Init_Call : Node_Id;

   begin
      if Ekind (Def_Id) = E_Variable then

         --  Find generated initialization call for object, if any

         Init_Call := Find_Init_Call (Def_Id, Rep_Clause => N);
         if Present (Init_Call) then
            Remove (Init_Call);
         end if;

         --  Any default initialization expression should be removed
         --  (e.g., null defaults for access objects, zero initialization
         --  of packed bit arrays). Imported objects aren't allowed to
         --  have explicit initialization, so the expression must have
         --  been generated by the compiler.

         if No (Init_Call) and then Present (Expression (Parent (Def_Id))) then
            Set_Expression (Parent (Def_Id), Empty);
         end if;
      end if;
   end Expand_Pragma_Import_Or_Interface;

   -------------------------------------------
   -- Expand_Pragma_Import_Export_Exception --
   -------------------------------------------

   --  For a VMS exception fix up the language field with "VMS"
   --  instead of "Ada" (gigi needs this), create a constant that will be the
   --  value of the VMS condition code and stuff the Interface_Name field
   --  with the unexpanded name of the exception (if not already set).
   --  For a Ada exception, just stuff the Interface_Name field
   --  with the unexpanded name of the exception (if not already set).

   procedure Expand_Pragma_Import_Export_Exception (N : Node_Id) is
   begin
      --  This pragma is only effective on OpenVMS systems, it was ignored
      --  on non-VMS systems, and we need to ignore it here as well.

      if not OpenVMS_On_Target then
         return;
      end if;

      declare
         Id     : constant Entity_Id := Entity (Arg1 (N));
         Call   : constant Node_Id := Register_Exception_Call (Id);
         Loc    : constant Source_Ptr := Sloc (N);

      begin
         if Present (Call) then
            declare
               Excep_Internal : constant Node_Id := Make_Temporary (Loc, 'V');
               Export_Pragma  : Node_Id;
               Excep_Alias    : Node_Id;
               Excep_Object   : Node_Id;
               Excep_Image    : String_Id;
               Exdata         : List_Id;
               Lang_Char      : Node_Id;
               Code           : Node_Id;

            begin
               if Present (Interface_Name (Id)) then
                  Excep_Image := Strval (Interface_Name (Id));
               else
                  Get_Name_String (Chars (Id));
                  Set_All_Upper_Case;
                  Excep_Image := String_From_Name_Buffer;
               end if;

               Exdata := Component_Associations (Expression (Parent (Id)));

               if Is_VMS_Exception (Id) then
                  Lang_Char := Next (First (Exdata));

                  --  Change the one-character language designator to 'V'

                  Rewrite (Expression (Lang_Char),
                    Make_Character_Literal (Loc,
                      Chars => Name_uV,
                      Char_Literal_Value =>
                        UI_From_Int (Character'Pos ('V'))));
                  Analyze (Expression (Lang_Char));

                  if Exception_Code (Id) /= No_Uint then
                     Code :=
                       Make_Integer_Literal (Loc,
                         Intval => Exception_Code (Id));

                     Excep_Object :=
                       Make_Object_Declaration (Loc,
                         Defining_Identifier => Excep_Internal,
                         Object_Definition   =>
                           New_Reference_To (RTE (RE_Exception_Code), Loc));

                     Insert_Action (N, Excep_Object);
                     Analyze (Excep_Object);

                     Start_String;
                     Store_String_Int
                       (UI_To_Int (Exception_Code (Id)) / 8 * 8);

                     Excep_Alias :=
                       Make_Pragma
                         (Loc,
                          Name_Linker_Alias,
                          New_List
                            (Make_Pragma_Argument_Association
                               (Sloc => Loc,
                                Expression =>
                                  New_Reference_To (Excep_Internal, Loc)),

                             Make_Pragma_Argument_Association
                               (Sloc => Loc,
                                Expression =>
                                  Make_String_Literal
                                    (Sloc => Loc,
                                     Strval => End_String))));

                     Insert_Action (N, Excep_Alias);
                     Analyze (Excep_Alias);

                     Export_Pragma :=
                       Make_Pragma
                         (Loc,
                          Name_Export,
                          New_List
                            (Make_Pragma_Argument_Association (Loc,
                               Expression => Make_Identifier (Loc, Name_C)),

                             Make_Pragma_Argument_Association (Loc,
                               Expression =>
                                 New_Reference_To (Excep_Internal, Loc)),

                             Make_Pragma_Argument_Association (Loc,
                               Expression =>
                                 Make_String_Literal (Loc, Excep_Image)),

                             Make_Pragma_Argument_Association (Loc,
                                Expression =>
                                  Make_String_Literal (Loc, Excep_Image))));

                     Insert_Action (N, Export_Pragma);
                     Analyze (Export_Pragma);

                  else
                     Code :=
                        Unchecked_Convert_To (RTE (RE_Exception_Code),
                          Make_Function_Call (Loc,
                            Name =>
                              New_Reference_To (RTE (RE_Import_Value), Loc),
                            Parameter_Associations => New_List
                              (Make_String_Literal (Loc,
                                Strval => Excep_Image))));
                  end if;

                  Rewrite (Call,
                    Make_Procedure_Call_Statement (Loc,
                      Name => New_Reference_To
                                (RTE (RE_Register_VMS_Exception), Loc),
                      Parameter_Associations => New_List (
                        Code,
                        Unchecked_Convert_To (RTE (RE_Exception_Data_Ptr),
                          Make_Attribute_Reference (Loc,
                            Prefix         => New_Occurrence_Of (Id, Loc),
                            Attribute_Name => Name_Unrestricted_Access)))));

                  Analyze_And_Resolve (Code, RTE (RE_Exception_Code));
                  Analyze (Call);
               end if;

               if No (Interface_Name (Id)) then
                  Set_Interface_Name (Id,
                     Make_String_Literal
                       (Sloc => Loc,
                        Strval => Excep_Image));
               end if;
            end;
         end if;
      end;
   end Expand_Pragma_Import_Export_Exception;

   ------------------------------------
   -- Expand_Pragma_Inspection_Point --
   ------------------------------------

   --  If no argument is given, then we supply a default argument list that
   --  includes all objects declared at the source level in all subprograms
   --  that enclose the inspection point pragma.

   procedure Expand_Pragma_Inspection_Point (N : Node_Id) is
      Loc : constant Source_Ptr := Sloc (N);
      A     : List_Id;
      Assoc : Node_Id;
      S     : Entity_Id;
      E     : Entity_Id;

   begin
      if No (Pragma_Argument_Associations (N)) then
         A := New_List;
         S := Current_Scope;

         while S /= Standard_Standard loop
            E := First_Entity (S);
            while Present (E) loop
               if Comes_From_Source (E)
                 and then Is_Object (E)
                 and then not Is_Entry_Formal (E)
                 and then Ekind (E) /= E_Component
                 and then Ekind (E) /= E_Discriminant
                 and then Ekind (E) /= E_Generic_In_Parameter
                 and then Ekind (E) /= E_Generic_In_Out_Parameter
               then
                  Append_To (A,
                    Make_Pragma_Argument_Association (Loc,
                      Expression => New_Occurrence_Of (E, Loc)));
               end if;

               Next_Entity (E);
            end loop;

            S := Scope (S);
         end loop;

         Set_Pragma_Argument_Associations (N, A);
      end if;

      --  Expand the arguments of the pragma. Expanding an entity reference
      --  is a noop, except in a protected operation, where a reference may
      --  have to be transformed into a reference to the corresponding prival.
      --  Are there other pragmas that may require this ???

      Assoc := First (Pragma_Argument_Associations (N));

      while Present (Assoc) loop
         Expand (Expression (Assoc));
         Next (Assoc);
      end loop;
   end Expand_Pragma_Inspection_Point;

   --------------------------------------
   -- Expand_Pragma_Interrupt_Priority --
   --------------------------------------

   --  Supply default argument if none exists (System.Interrupt_Priority'Last)

   procedure Expand_Pragma_Interrupt_Priority (N : Node_Id) is
      Loc : constant Source_Ptr := Sloc (N);

   begin
      if No (Pragma_Argument_Associations (N)) then
         Set_Pragma_Argument_Associations (N, New_List (
           Make_Pragma_Argument_Association (Loc,
             Expression =>
               Make_Attribute_Reference (Loc,
                 Prefix =>
                   New_Occurrence_Of (RTE (RE_Interrupt_Priority), Loc),
                 Attribute_Name => Name_Last))));
      end if;
   end Expand_Pragma_Interrupt_Priority;

   --------------------------------
   -- Expand_Pragma_Psect_Object --
   --------------------------------

   --  Convert to Common_Object, and expand the resulting pragma

   procedure Expand_Pragma_Psect_Object (N : Node_Id)
     renames Expand_Pragma_Common_Object;

   -------------------------------------
   -- Expand_Pragma_Relative_Deadline --
   -------------------------------------

   procedure Expand_Pragma_Relative_Deadline (N : Node_Id) is
      P    : constant Node_Id    := Parent (N);
      Loc  : constant Source_Ptr := Sloc (N);

   begin
      --  Expand the pragma only in the case of the main subprogram. For tasks
      --  the expansion is done in exp_ch9. Generate a call to Set_Deadline
      --  at Clock plus the relative deadline specified in the pragma. Time
      --  values are translated into Duration to allow for non-private
      --  addition operation.

      if Nkind (P) = N_Subprogram_Body then
         Rewrite
           (N,
            Make_Procedure_Call_Statement (Loc,
              Name => New_Reference_To (RTE (RE_Set_Deadline), Loc),
              Parameter_Associations => New_List (
                Unchecked_Convert_To (RTE (RO_RT_Time),
                  Make_Op_Add (Loc,
                    Left_Opnd  =>
                      Make_Function_Call (Loc,
                        New_Reference_To (RTE (RO_RT_To_Duration), Loc),
                        New_List (Make_Function_Call (Loc,
                          New_Reference_To (RTE (RE_Clock), Loc)))),
                    Right_Opnd  =>
                      Unchecked_Convert_To (Standard_Duration, Arg1 (N)))))));

         Analyze (N);
      end if;
   end Expand_Pragma_Relative_Deadline;

end Exp_Prag;