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
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
|
------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- G N A T 1 D R V --
-- --
-- B o d y --
-- --
-- Copyright (C) 1992-2019, 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 Back_End; use Back_End;
with Checks;
with Comperr;
with Csets;
with Debug; use Debug;
with Elists;
with Errout; use Errout;
with Exp_CG;
with Fmap;
with Fname; use Fname;
with Fname.UF; use Fname.UF;
with Frontend;
with Ghost; use Ghost;
with Gnatvsn; use Gnatvsn;
with Inline;
with Lib; use Lib;
with Lib.Writ; use Lib.Writ;
with Lib.Xref;
with Namet; use Namet;
with Nlists;
with Opt; use Opt;
with Osint; use Osint;
with Osint.C; use Osint.C;
with Output; use Output;
with Par_SCO;
with Prepcomp;
with Repinfo;
with Repinfo.Input;
with Restrict;
with Rident; use Rident;
with Rtsfind;
with SCOs;
with Sem;
with Sem_Ch8;
with Sem_Ch12;
with Sem_Ch13;
with Sem_Elim;
with Sem_Eval;
with Sem_Prag;
with Sem_SPARK; use Sem_SPARK;
with Sem_Type;
with Set_Targ;
with Sinfo; use Sinfo;
with Sinput; use Sinput;
with Sinput.L; use Sinput.L;
with Snames; use Snames;
with Sprint; use Sprint;
with Stringt;
with Stylesw; use Stylesw;
with Targparm; use Targparm;
with Tbuild;
with Tree_Gen;
with Treepr; use Treepr;
with Ttypes;
with Types; use Types;
with Uintp;
with Uname; use Uname;
with Urealp;
with Usage;
with Validsw; use Validsw;
with Warnsw; use Warnsw;
with System.Assertions;
with System.OS_Lib;
--------------
-- Gnat1drv --
--------------
procedure Gnat1drv is
procedure Adjust_Global_Switches;
-- There are various interactions between front-end switch settings,
-- including debug switch settings and target dependent parameters.
-- This procedure takes care of properly handling these interactions.
-- We do it after scanning out all the switches, so that we are not
-- depending on the order in which switches appear.
procedure Check_Bad_Body (Unit_Node : Node_Id; Unit_Kind : Node_Kind);
-- Called to check whether a unit described by its compilation unit node
-- and kind has a bad body.
procedure Check_Rep_Info;
-- Called when we are not generating code, to check if -gnatR was requested
-- and if so, explain that we will not be honoring the request.
procedure Post_Compilation_Validation_Checks;
-- This procedure performs various validation checks that have to be left
-- to the end of the compilation process, after generating code but before
-- issuing error messages. In particular, these checks generally require
-- the information provided by the back end in back annotation of declared
-- entities (e.g. actual size and alignment values chosen by the back end).
procedure Read_JSON_Files_For_Repinfo;
-- This procedure exercises the JSON parser of Repinfo by reading back the
-- JSON files generated by -gnatRjs in a previous compilation session. It
-- is intended to make sure that the JSON generator and the JSON parser are
-- kept synchronized when the JSON format evolves.
----------------------------
-- Adjust_Global_Switches --
----------------------------
procedure Adjust_Global_Switches is
procedure SPARK_Library_Warning (Kind : String);
-- Issue a warning in GNATprove mode if the run-time library does not
-- fully support IEEE-754 floating-point semantics.
---------------------------
-- SPARK_Library_Warning --
---------------------------
procedure SPARK_Library_Warning (Kind : String) is
begin
Write_Line
("warning: run-time library may be configured incorrectly");
Write_Line
("warning: (SPARK analysis requires support for " & Kind & ')');
end SPARK_Library_Warning;
-- Start of processing for Adjust_Global_Switches
begin
-- Define pragma GNAT_Annotate as an alias of pragma Annotate, to be
-- able to work around bootstrap limitations with the old syntax of
-- pragma Annotate, and use pragma GNAT_Annotate in compiler sources
-- when needed.
Map_Pragma_Name (From => Name_Gnat_Annotate, To => Name_Annotate);
-- -gnatd.M enables Relaxed_RM_Semantics
if Debug_Flag_Dot_MM then
Relaxed_RM_Semantics := True;
end if;
-- -gnatd.1 enables unnesting of subprograms
if Debug_Flag_Dot_1 then
Unnest_Subprogram_Mode := True;
end if;
-- -gnatd.u enables special C expansion mode
if Debug_Flag_Dot_U then
Modify_Tree_For_C := True;
end if;
-- -gnatd_A disables generation of ALI files
if Debug_Flag_Underscore_AA then
Disable_ALI_File := True;
end if;
-- Set all flags required when generating C code
if Generate_C_Code then
Modify_Tree_For_C := True;
Unnest_Subprogram_Mode := True;
Building_Static_Dispatch_Tables := False;
Minimize_Expression_With_Actions := True;
Expand_Nonbinary_Modular_Ops := True;
-- Set operating mode to Generate_Code to benefit from full front-end
-- expansion (e.g. generics).
Operating_Mode := Generate_Code;
-- Suppress alignment checks since we do not have access to alignment
-- info on the target.
Suppress_Options.Suppress (Alignment_Check) := False;
end if;
-- -gnatd.E sets Error_To_Warning mode, causing selected error messages
-- to be treated as warnings instead of errors.
if Debug_Flag_Dot_EE then
Error_To_Warning := True;
end if;
-- -gnatdJ sets Include_Subprogram_In_Messages, adding the related
-- subprogram as part of the error and warning messages.
if Debug_Flag_JJ then
Include_Subprogram_In_Messages := True;
end if;
-- Disable CodePeer_Mode in Check_Syntax, since we need front-end
-- expansion.
if Operating_Mode = Check_Syntax then
CodePeer_Mode := False;
end if;
-- Set ASIS mode if -gnatt and -gnatc are set
if Operating_Mode = Check_Semantics and then Tree_Output then
ASIS_Mode := True;
-- Set ASIS GNSA mode if -gnatd.H is set
if Debug_Flag_Dot_HH then
ASIS_GNSA_Mode := True;
end if;
-- Turn off inlining in ASIS mode, since ASIS cannot handle the extra
-- information in the trees caused by inlining being active.
-- More specifically, the tree seems to be malformed from the ASIS
-- point of view if -gnatc and -gnatn appear together???
Inline_Active := False;
-- Turn off SCIL generation and CodePeer mode in semantics mode,
-- since SCIL requires front-end expansion.
Generate_SCIL := False;
CodePeer_Mode := False;
end if;
-- SCIL mode needs to disable front-end inlining since the generated
-- trees (in particular order and consistency between specs compiled
-- as part of a main unit or as part of a with-clause) are causing
-- troubles.
if Generate_SCIL then
Front_End_Inlining := False;
end if;
-- Tune settings for optimal SCIL generation in CodePeer mode
if CodePeer_Mode then
-- Turn off gnatprove mode (which can be set via e.g. -gnatd.F), not
-- compatible with CodePeer mode.
GNATprove_Mode := False;
Debug_Flag_Dot_FF := False;
-- Turn off length expansion. CodePeer has its own mechanism to
-- handle length attribute.
Debug_Flag_Dot_PP := True;
-- Turn off C tree generation, not compatible with CodePeer mode. We
-- do not expect this to happen in normal use, since both modes are
-- enabled by special tools, but it is useful to turn off these flags
-- this way when we are doing CodePeer tests on existing test suites
-- that may have -gnateg set, to avoid the need for special casing.
Modify_Tree_For_C := False;
Generate_C_Code := False;
Unnest_Subprogram_Mode := False;
-- Turn off inlining, confuses CodePeer output and gains nothing
Front_End_Inlining := False;
Inline_Active := False;
-- Disable front-end optimizations, to keep the tree as close to the
-- source code as possible, and also to avoid inconsistencies between
-- trees when using different optimization switches.
Optimization_Level := 0;
-- Enable some restrictions systematically to simplify the generated
-- code (and ease analysis). Note that restriction checks are also
-- disabled in CodePeer mode, see Restrict.Check_Restriction, and
-- user specified Restrictions pragmas are ignored, see
-- Sem_Prag.Process_Restrictions_Or_Restriction_Warnings.
Restrict.Restrictions.Set (No_Exception_Registration) := True;
Restrict.Restrictions.Set (No_Initialize_Scalars) := True;
Restrict.Restrictions.Set (No_Task_Hierarchy) := True;
Restrict.Restrictions.Set (No_Abort_Statements) := True;
Restrict.Restrictions.Set (Max_Asynchronous_Select_Nesting) := True;
Restrict.Restrictions.Value (Max_Asynchronous_Select_Nesting) := 0;
-- Enable pragma Ignore_Pragma (Global) to support legacy code. As a
-- consequence, Refined_Global pragma should be ignored as well, as
-- it is only allowed on a body when pragma Global is given for the
-- spec.
Set_Name_Table_Boolean3 (Name_Global, True);
Set_Name_Table_Boolean3 (Name_Refined_Global, True);
-- Suppress division by zero checks since they are handled
-- implicitly by CodePeer.
-- Turn off dynamic elaboration checks: generates inconsistencies in
-- trees between specs compiled as part of a main unit or as part of
-- a with-clause.
-- Turn off alignment checks: these cannot be proved statically by
-- CodePeer and generate false positives.
-- Enable all other language checks
Suppress_Options.Suppress :=
(Alignment_Check => True,
Division_Check => True,
Elaboration_Check => True,
others => False);
-- Need to enable dynamic elaboration checks to disable strict
-- static checking performed by gnatbind. We are at the same time
-- suppressing actual compile time elaboration checks to simplify
-- the generated code.
Dynamic_Elaboration_Checks := True;
-- Set STRICT mode for overflow checks if not set explicitly. This
-- prevents suppressing of overflow checks by default, in code down
-- below.
if Suppress_Options.Overflow_Mode_General = Not_Set then
Suppress_Options.Overflow_Mode_General := Strict;
Suppress_Options.Overflow_Mode_Assertions := Strict;
end if;
-- CodePeer handles division and overflow checks directly, based on
-- the marks set by the frontend, hence no special expansion should
-- be performed in the frontend for division and overflow checks.
Backend_Divide_Checks_On_Target := True;
Backend_Overflow_Checks_On_Target := True;
-- Kill debug of generated code, since it messes up sloc values
Debug_Generated_Code := False;
-- Ditto for -gnateG which interacts badly with handling of pragma
-- Annotate in gnat2scil.
Generate_Processed_File := False;
-- Disable Exception_Extra_Info (-gnateE) which generates more
-- complex trees with no added value, and may confuse CodePeer.
Exception_Extra_Info := False;
-- Turn cross-referencing on in case it was disabled (e.g. by -gnatD)
-- to support source navigation.
Xref_Active := True;
-- Polling mode forced off, since it generates confusing junk
Polling_Required := False;
-- Set operating mode to Generate_Code to benefit from full front-end
-- expansion (e.g. generics).
Operating_Mode := Generate_Code;
-- We need SCIL generation of course
Generate_SCIL := True;
-- Enable assertions, since they give CodePeer valuable extra info
Assertions_Enabled := True;
-- Set normal RM validity checking and checking of copies (to catch
-- e.g. wrong values used in unchecked conversions).
-- All other validity checking is turned off, since this can generate
-- very complex trees that only confuse CodePeer and do not bring
-- enough useful info.
Reset_Validity_Check_Options;
Set_Validity_Check_Options ("dc");
Check_Validity_Of_Parameters := False;
-- Turn off style check options and ignore any style check pragmas
-- since we are not interested in any front-end warnings when we are
-- getting CodePeer output.
Reset_Style_Check_Options;
Ignore_Style_Checks_Pragmas := True;
-- Always perform semantics and generate ali files in CodePeer mode,
-- so that a gnatmake -c -k will proceed further when possible.
Force_ALI_Tree_File := True;
Try_Semantics := True;
-- Make the Ada front end more liberal so that the compiler will
-- allow illegal code that is allowed by other compilers. CodePeer
-- is in the business of finding problems, not enforcing rules.
-- This is useful when using CodePeer mode with other compilers.
Relaxed_RM_Semantics := True;
if Generate_CodePeer_Messages then
-- We do want to emit GNAT warnings when using -gnateC. But,
-- in CodePeer mode, warnings about memory representation are not
-- meaningful, thus, suppress them.
Warn_On_Biased_Representation := False; -- -gnatw.b
Warn_On_Unrepped_Components := False; -- -gnatw.c
Warn_On_Record_Holes := False; -- -gnatw.h
Warn_On_Unchecked_Conversion := False; -- -gnatwz
Warn_On_Size_Alignment := False; -- -gnatw.z
Warn_On_Questionable_Layout := False; -- -gnatw.q
Warn_On_Overridden_Size := False; -- -gnatw.s
Warn_On_Reverse_Bit_Order := False; -- -gnatw.v
else
-- Suppress compiler warnings by default when generating SCIL for
-- CodePeer, except when combined with -gnateC where we do want to
-- emit GNAT warnings.
Warning_Mode := Suppress;
end if;
-- Disable all simple value propagation. This is an optimization
-- which is valuable for code optimization, and also for generation
-- of compiler warnings, but these are being turned off by default,
-- and CodePeer generates better messages (referencing original
-- variables) this way.
-- Do this only if -gnatws is set (the default with -gnatcC), so that
-- if warnings are enabled, we'll get better messages from GNAT.
if Warning_Mode = Suppress then
Debug_Flag_MM := True;
end if;
end if;
-- Enable some individual switches that are implied by relaxed RM
-- semantics mode.
if Relaxed_RM_Semantics then
Opt.Allow_Integer_Address := True;
Overriding_Renamings := True;
Treat_Categorization_Errors_As_Warnings := True;
end if;
-- Enable GNATprove_Mode when using -gnatd.F switch
if Debug_Flag_Dot_FF then
GNATprove_Mode := True;
end if;
-- GNATprove_Mode is also activated by default in the gnat2why
-- executable.
if GNATprove_Mode then
-- Turn off CodePeer mode (which can be set via e.g. -gnatC or
-- -gnateC), not compatible with GNATprove mode.
CodePeer_Mode := False;
Generate_SCIL := False;
-- Turn off C tree generation, not compatible with GNATprove mode. We
-- do not expect this to happen in normal use, since both modes are
-- enabled by special tools, but it is useful to turn off these flags
-- this way when we are doing GNATprove tests on existing test suites
-- that may have -gnateg set, to avoid the need for special casing.
Modify_Tree_For_C := False;
Generate_C_Code := False;
Unnest_Subprogram_Mode := False;
-- Turn off inlining, which would confuse formal verification output
-- and gain nothing.
Front_End_Inlining := False;
Inline_Active := False;
-- Issue warnings for failure to inline subprograms, as otherwise
-- expected in GNATprove mode for the local subprograms without
-- contracts.
Ineffective_Inline_Warnings := True;
-- Do not issue warnings for possible propagation of exception.
-- GNATprove already issues messages about possible exceptions.
No_Warn_On_Non_Local_Exception := True;
Warn_On_Non_Local_Exception := False;
-- Disable front-end optimizations, to keep the tree as close to the
-- source code as possible, and also to avoid inconsistencies between
-- trees when using different optimization switches.
Optimization_Level := 0;
-- Enable some restrictions systematically to simplify the generated
-- code (and ease analysis).
Restrict.Restrictions.Set (No_Initialize_Scalars) := True;
-- Note: at this point we used to suppress various checks, but that
-- is not what we want. We need the semantic processing for these
-- checks (which will set flags like Do_Overflow_Check, showing the
-- points at which potential checks are required semantically). We
-- don't want the expansion associated with these checks, but that
-- happens anyway because this expansion is simply not done in the
-- SPARK version of the expander.
-- On the contrary, we need to enable explicitly all language checks,
-- as they may have been suppressed by the use of switch -gnatp.
Suppress_Options.Suppress := (others => False);
-- Detect overflow on unconstrained floating-point types, such as
-- the predefined types Float, Long_Float and Long_Long_Float from
-- package Standard. Not necessary if float overflows are checked
-- (Machine_Overflow true), since appropriate Do_Overflow_Check flags
-- will be set in any case.
Check_Float_Overflow := not Machine_Overflows_On_Target;
-- Set STRICT mode for overflow checks if not set explicitly. This
-- prevents suppressing of overflow checks by default, in code down
-- below.
if Suppress_Options.Overflow_Mode_General = Not_Set then
Suppress_Options.Overflow_Mode_General := Strict;
Suppress_Options.Overflow_Mode_Assertions := Strict;
end if;
-- Kill debug of generated code, since it messes up sloc values
Debug_Generated_Code := False;
-- Turn cross-referencing on in case it was disabled (e.g. by -gnatD)
-- as it is needed for computing effects of subprograms in the formal
-- verification backend.
Xref_Active := True;
-- Polling mode forced off, since it generates confusing junk
Polling_Required := False;
-- Set operating mode to Check_Semantics, but a light front-end
-- expansion is still performed.
Operating_Mode := Check_Semantics;
-- Enable assertions, since they give valuable extra information for
-- formal verification.
Assertions_Enabled := True;
-- Disable validity checks, since it generates code raising
-- exceptions for invalid data, which confuses GNATprove. Invalid
-- data is directly detected by GNATprove's flow analysis.
Validity_Checks_On := False;
Check_Validity_Of_Parameters := False;
-- Turn off style check options since we are not interested in any
-- front-end warnings when we are getting SPARK output.
Reset_Style_Check_Options;
-- Suppress the generation of name tables for enumerations, which are
-- not needed for formal verification, and fall outside the SPARK
-- subset (use of pointers).
Global_Discard_Names := True;
-- Suppress the expansion of tagged types and dispatching calls,
-- which lead to the generation of non-SPARK code (use of pointers),
-- which is more complex to formally verify than the original source.
Tagged_Type_Expansion := False;
-- Detect that the runtime library support for floating-point numbers
-- may not be compatible with SPARK analysis of IEEE-754 floats.
if Denorm_On_Target = False then
SPARK_Library_Warning ("float subnormals");
elsif Machine_Rounds_On_Target = False then
SPARK_Library_Warning ("float rounding");
elsif Signed_Zeros_On_Target = False then
SPARK_Library_Warning ("signed zeros");
end if;
end if;
-- Set Configurable_Run_Time mode if system.ads flag set or if the
-- special debug flag -gnatdY is set.
if Targparm.Configurable_Run_Time_On_Target or Debug_Flag_YY then
Configurable_Run_Time_Mode := True;
end if;
-- Set -gnatRm mode if debug flag A set
if Debug_Flag_AA then
Back_Annotate_Rep_Info := True;
List_Representation_Info := 1;
List_Representation_Info_Mechanisms := True;
end if;
-- Force Target_Strict_Alignment true if debug flag -gnatd.a is set
if Debug_Flag_Dot_A then
Ttypes.Target_Strict_Alignment := True;
end if;
-- Increase size of allocated entities if debug flag -gnatd.N is set
if Debug_Flag_Dot_NN then
Atree.Num_Extension_Nodes := Atree.Num_Extension_Nodes + 1;
end if;
-- Disable static allocation of dispatch tables if -gnatd.t is enabled.
-- The front end's layout phase currently treats types that have
-- discriminant-dependent arrays as not being static even when a
-- discriminant constraint on the type is static, and this leads to
-- problems with subtypes of type Ada.Tags.Dispatch_Table_Wrapper. ???
if Debug_Flag_Dot_T then
Building_Static_Dispatch_Tables := False;
end if;
-- Flip endian mode if -gnatd8 set
if Debug_Flag_8 then
Ttypes.Bytes_Big_Endian := not Ttypes.Bytes_Big_Endian;
end if;
-- Set and check exception mechanism. This is only meaningful when
-- compiling, and in particular not meaningful for special modes used
-- for program analysis rather than compilation: ASIS mode, CodePeer
-- mode and GNATprove mode.
if Operating_Mode = Generate_Code
and then not (ASIS_Mode or CodePeer_Mode or GNATprove_Mode)
then
case Targparm.Frontend_Exceptions_On_Target is
when True =>
case Targparm.ZCX_By_Default_On_Target is
when True =>
Write_Line
("Run-time library configured incorrectly");
Write_Line
("(requesting support for Frontend ZCX exceptions)");
raise Unrecoverable_Error;
when False =>
Exception_Mechanism := Front_End_SJLJ;
end case;
when False =>
case Targparm.ZCX_By_Default_On_Target is
when True =>
Exception_Mechanism := Back_End_ZCX;
when False =>
Exception_Mechanism := Back_End_SJLJ;
end case;
end case;
end if;
-- Set proper status for overflow check mechanism
-- If already set (by -gnato or above in SPARK or CodePeer mode) then we
-- have nothing to do.
if Opt.Suppress_Options.Overflow_Mode_General /= Not_Set then
null;
-- Otherwise set overflow mode defaults
else
-- Overflow checks are on by default (Suppress set False) except in
-- GNAT_Mode, where we want them off by default (we are not ready to
-- enable overflow checks in the compiler yet, for one thing the case
-- of 64-bit checks needs System.Arith_64 which is not a compiler
-- unit and it is a pain to try to include it in the compiler.
Suppress_Options.Suppress (Overflow_Check) := GNAT_Mode;
-- Set appropriate default overflow handling mode. Note: at present
-- we set STRICT in all three of the following cases. They are
-- separated because in the future we may make different choices.
-- By default set STRICT mode if -gnatg in effect
if GNAT_Mode then
Suppress_Options.Overflow_Mode_General := Strict;
Suppress_Options.Overflow_Mode_Assertions := Strict;
-- If we have backend divide and overflow checks, then by default
-- overflow checks are STRICT. Historically this code used to also
-- activate overflow checks, although no target currently has these
-- flags set, so this was dead code anyway.
elsif Targparm.Backend_Divide_Checks_On_Target
and
Targparm.Backend_Overflow_Checks_On_Target
then
Suppress_Options.Overflow_Mode_General := Strict;
Suppress_Options.Overflow_Mode_Assertions := Strict;
-- Otherwise for now, default is STRICT mode. This may change in the
-- future, but for now this is the compatible behavior with previous
-- versions of GNAT.
else
Suppress_Options.Overflow_Mode_General := Strict;
Suppress_Options.Overflow_Mode_Assertions := Strict;
end if;
end if;
-- Set default for atomic synchronization. As this synchronization
-- between atomic accesses can be expensive, and not typically needed
-- on some targets, an optional target parameter can turn the option
-- off. Note Atomic Synchronization is implemented as check.
Suppress_Options.Suppress (Atomic_Synchronization) :=
not Atomic_Sync_Default_On_Target;
-- Set default for Alignment_Check, if we are on a machine with non-
-- strict alignment, then we suppress this check, since it is over-
-- zealous for such machines.
if not Ttypes.Target_Strict_Alignment then
Suppress_Options.Suppress (Alignment_Check) := True;
end if;
-- Set switch indicating if back end can handle limited types, and
-- guarantee that no incorrect copies are made (e.g. in the context
-- of an if or case expression).
-- Debug flag -gnatd.L decisively sets usage on
if Debug_Flag_Dot_LL then
Back_End_Handles_Limited_Types := True;
-- If no debug flag, usage off for SCIL cases
elsif Generate_SCIL then
Back_End_Handles_Limited_Types := False;
-- Otherwise normal gcc back end, for now still turn flag off by
-- default, since there are unresolved problems in the front end.
else
Back_End_Handles_Limited_Types := False;
end if;
-- If the inlining level has not been set by the user, compute it from
-- the optimization level: 1 at -O1/-O2 (and -Os), 2 at -O3 and above.
if Inline_Level = 0 then
if Optimization_Level < 3 then
Inline_Level := 1;
else
Inline_Level := 2;
end if;
end if;
-- Treat -gnatn as equivalent to -gnatN for non-GCC targets
if Inline_Active and not Front_End_Inlining then
-- We really should have a tag for this, what if we added a new
-- back end some day, it would not be true for this test, but it
-- would be non-GCC, so this is a bit troublesome ???
Front_End_Inlining := Generate_C_Code;
end if;
-- Set back-end inlining indication
Back_End_Inlining :=
-- No back-end inlining available on C generation
not Generate_C_Code
-- No back-end inlining in GNATprove mode, since it just confuses
-- the formal verification process.
and then not GNATprove_Mode
-- No back-end inlining if front-end inlining explicitly enabled.
-- Done to minimize the output differences to customers still using
-- this deprecated switch; in addition, this behavior reduces the
-- output differences in old tests.
and then not Front_End_Inlining
-- Back-end inlining is disabled if debug flag .z is set
and then not Debug_Flag_Dot_Z;
-- Output warning if -gnateE specified and cannot be supported
if Exception_Extra_Info
and then Restrict.No_Exception_Handlers_Set
then
Set_Standard_Error;
Write_Str
("warning: extra exception information (-gnateE) was specified");
Write_Eol;
Write_Str
("warning: this capability is not available in this configuration");
Write_Eol;
Set_Standard_Output;
end if;
-- Finally capture adjusted value of Suppress_Options as the initial
-- value for Scope_Suppress, which will be modified as we move from
-- scope to scope (by Suppress/Unsuppress/Overflow_Checks pragmas).
Sem.Scope_Suppress := Opt.Suppress_Options;
end Adjust_Global_Switches;
--------------------
-- Check_Bad_Body --
--------------------
procedure Check_Bad_Body (Unit_Node : Node_Id; Unit_Kind : Node_Kind) is
Fname : File_Name_Type;
procedure Bad_Body_Error (Msg : String);
-- Issue message for bad body found
--------------------
-- Bad_Body_Error --
--------------------
procedure Bad_Body_Error (Msg : String) is
begin
Error_Msg_N (Msg, Unit_Node);
Error_Msg_File_1 := Fname;
Error_Msg_N ("remove incorrect body in file{!", Unit_Node);
end Bad_Body_Error;
-- Local variables
Sname : Unit_Name_Type;
Src_Ind : Source_File_Index;
-- Start of processing for Check_Bad_Body
begin
-- Nothing to do if we are only checking syntax, because we don't know
-- enough to know if we require or forbid a body in this case.
if Operating_Mode = Check_Syntax then
return;
end if;
-- Check for body not allowed
if (Unit_Kind = N_Package_Declaration
and then not Body_Required (Unit_Node))
or else (Unit_Kind = N_Generic_Package_Declaration
and then not Body_Required (Unit_Node))
or else Unit_Kind = N_Package_Renaming_Declaration
or else Unit_Kind = N_Subprogram_Renaming_Declaration
or else Nkind (Original_Node (Unit (Unit_Node)))
in N_Generic_Instantiation
then
Sname := Unit_Name (Main_Unit);
-- If we do not already have a body name, then get the body name
if not Is_Body_Name (Sname) then
Sname := Get_Body_Name (Sname);
end if;
Fname := Get_File_Name (Sname, Subunit => False);
Src_Ind := Load_Source_File (Fname);
-- Case where body is present and it is not a subunit. Exclude the
-- subunit case, because it has nothing to do with the package we are
-- compiling. It is illegal for a child unit and a subunit with the
-- same expanded name (RM 10.2(9)) to appear together in a partition,
-- but there is nothing to stop a compilation environment from having
-- both, and the test here simply allows that. If there is an attempt
-- to include both in a partition, this is diagnosed at bind time. In
-- Ada 83 mode this is not a warning case.
-- Note that in general we do not give the message if the file in
-- question does not look like a body. This includes weird cases,
-- but in particular means that if the file is just a No_Body pragma,
-- then we won't give the message (that's the whole point of this
-- pragma, to be used this way and to cause the body file to be
-- ignored in this context).
if Src_Ind > No_Source_File
and then Source_File_Is_Body (Src_Ind)
then
Errout.Finalize (Last_Call => False);
Error_Msg_Unit_1 := Sname;
-- Ada 83 case of a package body being ignored. This is not an
-- error as far as the Ada 83 RM is concerned, but it is almost
-- certainly not what is wanted so output a warning. Give this
-- message only if there were no errors, since otherwise it may
-- be incorrect (we may have misinterpreted a junk spec as not
-- needing a body when it really does).
if Unit_Kind = N_Package_Declaration
and then Ada_Version = Ada_83
and then Operating_Mode = Generate_Code
and then Distribution_Stub_Mode /= Generate_Caller_Stub_Body
and then not Compilation_Errors
then
Error_Msg_N
("package $$ does not require a body??", Unit_Node);
Error_Msg_File_1 := Fname;
Error_Msg_N ("body in file{ will be ignored??", Unit_Node);
-- Ada 95 cases of a body file present when no body is
-- permitted. This we consider to be an error.
else
-- For generic instantiations, we never allow a body
if Nkind (Original_Node (Unit (Unit_Node))) in
N_Generic_Instantiation
then
Bad_Body_Error
("generic instantiation for $$ does not allow a body");
-- A library unit that is a renaming never allows a body
elsif Unit_Kind in N_Renaming_Declaration then
Bad_Body_Error
("renaming declaration for $$ does not allow a body!");
-- Remaining cases are packages and generic packages. Here
-- we only do the test if there are no previous errors,
-- because if there are errors, they may lead us to
-- incorrectly believe that a package does not allow a
-- body when in fact it does.
elsif not Compilation_Errors then
if Unit_Kind = N_Package_Declaration then
Bad_Body_Error
("package $$ does not allow a body!");
elsif Unit_Kind = N_Generic_Package_Declaration then
Bad_Body_Error
("generic package $$ does not allow a body!");
end if;
end if;
end if;
end if;
end if;
end Check_Bad_Body;
--------------------
-- Check_Rep_Info --
--------------------
procedure Check_Rep_Info is
begin
if List_Representation_Info /= 0
or else List_Representation_Info_Mechanisms
then
Set_Standard_Error;
Write_Eol;
Write_Str
("cannot generate representation information, no code generated");
Write_Eol;
Write_Eol;
Set_Standard_Output;
end if;
end Check_Rep_Info;
----------------------------------------
-- Post_Compilation_Validation_Checks --
----------------------------------------
procedure Post_Compilation_Validation_Checks is
begin
-- Validate alignment check warnings. In some cases we generate warnings
-- about possible alignment errors because we don't know the alignment
-- that will be chosen by the back end. This routine is in charge of
-- getting rid of those warnings if we can tell they are not needed.
Checks.Validate_Alignment_Check_Warnings;
-- Validate compile time warnings and errors (using the values for size
-- and alignment annotated by the backend where possible). We need to
-- unlock temporarily these tables to reanalyze their expression.
Atree.Unlock;
Nlists.Unlock;
Sem.Unlock;
Sem_Prag.Validate_Compile_Time_Warning_Errors;
Sem.Lock;
Nlists.Lock;
Atree.Lock;
-- Validate unchecked conversions (using the values for size and
-- alignment annotated by the backend where possible).
Sem_Ch13.Validate_Unchecked_Conversions;
-- Validate address clauses (again using alignment values annotated
-- by the backend where possible).
Sem_Ch13.Validate_Address_Clauses;
-- Validate independence pragmas (again using values annotated by the
-- back end for component layout where possible) but only for non-GCC
-- back ends, as this is done a priori for GCC back ends.
-- ??? We use to test for AAMP_On_Target which is now gone, consider
--
-- if AAMP_On_Target then
-- Sem_Ch13.Validate_Independence;
-- end if;
end Post_Compilation_Validation_Checks;
-----------------------------------
-- Read_JSON_Files_For_Repinfo --
-----------------------------------
procedure Read_JSON_Files_For_Repinfo is
begin
-- This is the same loop construct as in Repinfo.List_Rep_Info
for U in Main_Unit .. Last_Unit loop
if In_Extended_Main_Source_Unit (Cunit_Entity (U)) then
declare
Nam : constant String :=
Get_Name_String (File_Name (Source_Index (U))) & ".json";
Namid : constant File_Name_Type := Name_Enter (Nam);
Index : constant Source_File_Index := Load_Config_File (Namid);
begin
if Index = No_Source_File then
Write_Str ("cannot locate ");
Write_Line (Nam);
raise Unrecoverable_Error;
end if;
Repinfo.Input.Read_JSON_Stream (Source_Text (Index).all, Nam);
exception
when Repinfo.Input.Invalid_JSON_Stream =>
raise Unrecoverable_Error;
end;
end if;
end loop;
end Read_JSON_Files_For_Repinfo;
-- Local variables
Back_End_Mode : Back_End.Back_End_Mode_Type;
Ecode : Exit_Code_Type;
Main_Unit_Kind : Node_Kind;
-- Kind of main compilation unit node
Main_Unit_Node : Node_Id;
-- Compilation unit node for main unit
-- Start of processing for Gnat1drv
begin
-- This inner block is set up to catch assertion errors and constraint
-- errors. Since the code for handling these errors can cause another
-- exception to be raised (namely Unrecoverable_Error), we need two
-- nested blocks, so that the outer one handles unrecoverable error.
begin
-- Initialize all packages. For the most part, these initialization
-- calls can be made in any order. Exceptions are as follows:
-- Lib.Initialize need to be called before Scan_Compiler_Arguments,
-- because it initializes a table filled by Scan_Compiler_Arguments.
Osint.Initialize;
Fmap.Reset_Tables;
Lib.Initialize;
Lib.Xref.Initialize;
Scan_Compiler_Arguments;
Osint.Add_Default_Search_Dirs;
Atree.Initialize;
Nlists.Initialize;
Sinput.Initialize;
Sem.Initialize;
Exp_CG.Initialize;
Csets.Initialize;
Uintp.Initialize;
Urealp.Initialize;
Errout.Initialize;
SCOs.Initialize;
Snames.Initialize;
Stringt.Initialize;
Ghost.Initialize;
Inline.Initialize;
Par_SCO.Initialize;
Sem_Ch8.Initialize;
Sem_Ch12.Initialize;
Sem_Ch13.Initialize;
Sem_Elim.Initialize;
Sem_Eval.Initialize;
Sem_Type.Init_Interp_Tables;
-- Capture compilation date and time
Opt.Compilation_Time := System.OS_Lib.Current_Time_String;
-- Get the target parameters only when -gnats is not used, to avoid
-- failing when there is no default runtime.
if Operating_Mode /= Check_Syntax then
-- Acquire target parameters from system.ads (package System source)
Targparm_Acquire : declare
S : Source_File_Index;
N : File_Name_Type;
begin
Name_Buffer (1 .. 10) := "system.ads";
Name_Len := 10;
N := Name_Find;
S := Load_Source_File (N);
-- Failed to read system.ads, fatal error
if S = No_Source_File then
Write_Line
("fatal error, run-time library not installed correctly");
Write_Line ("cannot locate file system.ads");
raise Unrecoverable_Error;
elsif S = No_Access_To_Source_File then
Write_Line
("fatal error, run-time library not installed correctly");
Write_Line ("no read access for file system.ads");
raise Unrecoverable_Error;
-- Read system.ads successfully, remember its source index
else
System_Source_File_Index := S;
end if;
-- Call to get target parameters. Note that the actual interface
-- routines are in Tbuild. They can't be in this procedure because
-- of accessibility issues.
Targparm.Get_Target_Parameters
(System_Text => Source_Text (S),
Source_First => Source_First (S),
Source_Last => Source_Last (S),
Make_Id => Tbuild.Make_Id'Access,
Make_SC => Tbuild.Make_SC'Access,
Set_NOD => Tbuild.Set_NOD'Access,
Set_NSA => Tbuild.Set_NSA'Access,
Set_NUA => Tbuild.Set_NUA'Access,
Set_NUP => Tbuild.Set_NUP'Access);
-- Acquire configuration pragma information from Targparm
Restrict.Restrictions := Targparm.Restrictions_On_Target;
end Targparm_Acquire;
end if;
-- Perform various adjustments and settings of global switches
Adjust_Global_Switches;
-- Output copyright notice if full list mode unless we have a list
-- file, in which case we defer this so that it is output in the file.
if (Verbose_Mode or else (Full_List and then Full_List_File_Name = null))
-- Debug flag gnatd7 suppresses this copyright notice
and then not Debug_Flag_7
then
Write_Eol;
Write_Str ("GNAT ");
Write_Str (Gnat_Version_String);
Write_Eol;
Write_Str ("Copyright 1992-" & Current_Year
& ", Free Software Foundation, Inc.");
Write_Eol;
end if;
-- Check we do not have more than one source file, this happens only in
-- the case where the driver is called directly, it cannot happen when
-- gnat1 is invoked from gcc in the normal case.
if Osint.Number_Of_Files /= 1 then
-- In GNATprove mode, gcc is not called, so we may end up with
-- switches wrongly interpreted as source file names when they are
-- written by mistake without a starting hyphen. Issue a specific
-- error message but do not print the internal 'usage' message.
if GNATprove_Mode then
Write_Str
("one of the following is not a valid switch or source file "
& "name: ");
Osint.Dump_Command_Line_Source_File_Names;
else
Usage;
Write_Eol;
end if;
Osint.Fail ("you must provide one source file");
elsif Usage_Requested then
Usage;
end if;
-- Generate target dependent output file if requested
if Target_Dependent_Info_Write_Name /= null then
Set_Targ.Write_Target_Dependent_Values;
end if;
-- Call the front end
Original_Operating_Mode := Operating_Mode;
Frontend;
-- Exit with errors if the main source could not be parsed
if Sinput.Main_Source_File <= No_Source_File then
Errout.Finalize (Last_Call => True);
Errout.Output_Messages;
Exit_Program (E_Errors);
end if;
Main_Unit_Node := Cunit (Main_Unit);
Main_Unit_Kind := Nkind (Unit (Main_Unit_Node));
Check_Bad_Body (Main_Unit_Node, Main_Unit_Kind);
-- In CodePeer mode we always delete old SCIL files before regenerating
-- new ones, in case of e.g. errors, and also to remove obsolete scilx
-- files generated by CodePeer itself.
if CodePeer_Mode then
Comperr.Delete_SCIL_Files;
end if;
-- Ditto for old C files before regenerating new ones
if Generate_C_Code then
Delete_C_File;
Delete_H_File;
end if;
-- Exit if compilation errors detected
Errout.Finalize (Last_Call => False);
if Compilation_Errors then
Treepr.Tree_Dump;
Post_Compilation_Validation_Checks;
Errout.Finalize (Last_Call => True);
Errout.Output_Messages;
Namet.Finalize;
-- Generate ALI file if specially requested
if Opt.Force_ALI_Tree_File then
Write_ALI (Object => False);
Tree_Gen;
end if;
Exit_Program (E_Errors);
end if;
-- Set Generate_Code on main unit and its spec. We do this even if are
-- not generating code, since Lib-Writ uses this to determine which
-- units get written in the ali file.
Set_Generate_Code (Main_Unit);
-- If we have a corresponding spec, and it comes from source or it is
-- not a generated spec for a child subprogram body, then we need object
-- code for the spec unit as well.
if Nkind (Unit (Main_Unit_Node)) in N_Unit_Body
and then not Acts_As_Spec (Main_Unit_Node)
then
if Nkind (Unit (Main_Unit_Node)) = N_Subprogram_Body
and then not Comes_From_Source (Library_Unit (Main_Unit_Node))
then
null;
else
Set_Generate_Code
(Get_Cunit_Unit_Number (Library_Unit (Main_Unit_Node)));
end if;
end if;
-- Case of no code required to be generated, exit indicating no error
if Original_Operating_Mode = Check_Syntax then
Treepr.Tree_Dump;
Errout.Finalize (Last_Call => True);
Errout.Output_Messages;
Tree_Gen;
Namet.Finalize;
Check_Rep_Info;
-- Use a goto instead of calling Exit_Program so that finalization
-- occurs normally.
goto End_Of_Program;
elsif Original_Operating_Mode = Check_Semantics then
Back_End_Mode := Declarations_Only;
-- All remaining cases are cases in which the user requested that code
-- be generated (i.e. no -gnatc or -gnats switch was used). Check if we
-- can in fact satisfy this request.
-- Cannot generate code if someone has turned off code generation for
-- any reason at all. We will try to figure out a reason below.
elsif Operating_Mode /= Generate_Code then
Back_End_Mode := Skip;
-- We can generate code for a subprogram body unless there were missing
-- subunits. Note that we always generate code for all generic units (a
-- change from some previous versions of GNAT).
elsif Main_Unit_Kind = N_Subprogram_Body
and then not Subunits_Missing
then
Back_End_Mode := Generate_Object;
-- We can generate code for a package body unless there are subunits
-- missing (note that we always generate code for generic units, which
-- is a change from some earlier versions of GNAT).
elsif Main_Unit_Kind = N_Package_Body and then not Subunits_Missing then
Back_End_Mode := Generate_Object;
-- We can generate code for a package declaration or a subprogram
-- declaration only if it does not required a body.
elsif Nkind_In (Main_Unit_Kind, N_Package_Declaration,
N_Subprogram_Declaration)
and then
(not Body_Required (Main_Unit_Node)
or else Distribution_Stub_Mode = Generate_Caller_Stub_Body)
then
Back_End_Mode := Generate_Object;
-- We can generate code for a generic package declaration of a generic
-- subprogram declaration only if does not require a body.
elsif Nkind_In (Main_Unit_Kind, N_Generic_Package_Declaration,
N_Generic_Subprogram_Declaration)
and then not Body_Required (Main_Unit_Node)
then
Back_End_Mode := Generate_Object;
-- Compilation units that are renamings do not require bodies, so we can
-- generate code for them.
elsif Nkind_In (Main_Unit_Kind, N_Package_Renaming_Declaration,
N_Subprogram_Renaming_Declaration)
then
Back_End_Mode := Generate_Object;
-- Compilation units that are generic renamings do not require bodies
-- so we can generate code for them.
elsif Main_Unit_Kind in N_Generic_Renaming_Declaration then
Back_End_Mode := Generate_Object;
-- It is not an error to analyze in CodePeer mode a spec which requires
-- a body, in order to generate SCIL for this spec.
-- Ditto for Generate_C_Code mode and generate a C header for a spec.
elsif CodePeer_Mode or Generate_C_Code then
Back_End_Mode := Generate_Object;
-- It is not an error to analyze in GNATprove mode a spec which requires
-- a body, when the body is not available. During frame condition
-- generation, the corresponding ALI file is generated. During
-- analysis, the spec is analyzed.
elsif GNATprove_Mode then
Back_End_Mode := Declarations_Only;
-- In all other cases (specs which have bodies, generics, and bodies
-- where subunits are missing), we cannot generate code and we generate
-- a warning message. Note that generic instantiations are gone at this
-- stage since they have been replaced by their instances.
else
Back_End_Mode := Skip;
end if;
-- At this stage Back_End_Mode is set to indicate if the backend should
-- be called to generate code. If it is Skip, then code generation has
-- been turned off, even though code was requested by the original
-- command. This is not an error from the user point of view, but it is
-- an error from the point of view of the gcc driver, so we must exit
-- with an error status.
-- We generate an informative message (from the gcc point of view, it
-- is an error message, but from the users point of view this is not an
-- error, just a consequence of compiling something that cannot
-- generate code).
if Back_End_Mode = Skip then
-- An ignored Ghost unit is rewritten into a null statement because
-- it must not produce an ALI or object file. Do not emit any errors
-- related to code generation because the unit does not exist.
if Is_Ignored_Ghost_Unit (Main_Unit_Node) then
-- Exit the gnat driver with success, otherwise external builders
-- such as gnatmake and gprbuild will treat the compilation of an
-- ignored Ghost unit as a failure. Note that this will produce
-- an empty object file for the unit.
Ecode := E_Success;
-- Otherwise the unit is missing a crucial piece that prevents code
-- generation.
else
Ecode := E_No_Code;
Set_Standard_Error;
Write_Str ("cannot generate code for file ");
Write_Name (Unit_File_Name (Main_Unit));
if Subunits_Missing then
Write_Str (" (missing subunits)");
Write_Eol;
-- Force generation of ALI file, for backward compatibility
Opt.Force_ALI_Tree_File := True;
elsif Main_Unit_Kind = N_Subunit then
Write_Str (" (subunit)");
Write_Eol;
-- Do not generate an ALI file in this case, because it would
-- become obsolete when the parent is compiled, and thus
-- confuse tools such as gnatfind.
elsif Main_Unit_Kind = N_Subprogram_Declaration then
Write_Str (" (subprogram spec)");
Write_Eol;
-- Generic package body in GNAT implementation mode
elsif Main_Unit_Kind = N_Package_Body and then GNAT_Mode then
Write_Str (" (predefined generic)");
Write_Eol;
-- Force generation of ALI file, for backward compatibility
Opt.Force_ALI_Tree_File := True;
-- Only other case is a package spec
else
Write_Str (" (package spec)");
Write_Eol;
end if;
end if;
Set_Standard_Output;
Post_Compilation_Validation_Checks;
Errout.Finalize (Last_Call => True);
Errout.Output_Messages;
Treepr.Tree_Dump;
Tree_Gen;
-- Generate ALI file if specially requested, or for missing subunits,
-- subunits or predefined generic. For ignored ghost code, the object
-- file IS generated, so Object should be True, and since the object
-- file is generated, we need to generate the ALI file. We never want
-- an object file without an ALI file.
if Is_Ignored_Ghost_Unit (Main_Unit_Node)
or else Opt.Force_ALI_Tree_File
then
Write_ALI (Object => Is_Ignored_Ghost_Unit (Main_Unit_Node));
end if;
Namet.Finalize;
Check_Rep_Info;
-- Exit the driver with an appropriate status indicator. This will
-- generate an empty object file for ignored Ghost units, otherwise
-- no object file will be generated.
Exit_Program (Ecode);
end if;
-- In -gnatc mode we only do annotation if -gnatt or -gnatR is also set,
-- or if -gnatwz is enabled (default setting) and there is an unchecked
-- conversion that involves a type whose size is not statically known,
-- as indicated by Back_Annotate_Rep_Info being set to True.
-- We don't call for annotations on a subunit, because to process those
-- the back end requires that the parent(s) be properly compiled.
-- Annotation is suppressed for targets where front-end layout is
-- enabled, because the front end determines representations.
-- The back end is not invoked in ASIS mode with GNSA because all type
-- representation information will be provided by the GNSA back end, not
-- gigi.
-- A special back end is always called in CodePeer and GNATprove modes,
-- unless this is a subunit.
if Back_End_Mode = Declarations_Only
and then
(not (Back_Annotate_Rep_Info or Generate_SCIL or GNATprove_Mode)
or else Main_Unit_Kind = N_Subunit
or else ASIS_GNSA_Mode)
then
Post_Compilation_Validation_Checks;
Errout.Finalize (Last_Call => True);
Errout.Output_Messages;
Write_ALI (Object => False);
Tree_Dump;
Tree_Gen;
Namet.Finalize;
if not (Generate_SCIL or GNATprove_Mode) then
Check_Rep_Info;
end if;
return;
end if;
-- Ensure that we properly register a dependency on system.ads, since
-- even if we do not semantically depend on this, Targparm has read
-- system parameters from the system.ads file.
Lib.Writ.Ensure_System_Dependency;
-- Add dependencies, if any, on preprocessing data file and on
-- preprocessing definition file(s).
Prepcomp.Add_Dependencies;
if GNATprove_Mode then
-- Perform the new SPARK checking rules for pointer aliasing. This is
-- only activated in GNATprove mode and on SPARK code.
if Debug_Flag_FF then
Check_Safe_Pointers (Main_Unit_Node);
end if;
-- In GNATprove mode we're writing the ALI much earlier than usual
-- as flow analysis needs the file present in order to append its
-- own globals to it.
-- Note: In GNATprove mode, an "object" file is always generated as
-- the result of calling gnat1 or gnat2why, although this is not the
-- same as the object file produced for compilation.
Write_ALI (Object => True);
end if;
-- Some back ends (for instance Gigi) are known to rely on SCOs for code
-- generation. Make sure they are available.
if Generate_SCO then
Par_SCO.SCO_Record_Filtered;
end if;
-- If -gnatd_j is specified, exercise the JSON parser of Repinfo
if Debug_Flag_Underscore_J then
Read_JSON_Files_For_Repinfo;
end if;
-- Back end needs to explicitly unlock tables it needs to touch
Atree.Lock;
Elists.Lock;
Fname.UF.Lock;
Ghost.Lock;
Inline.Lock;
Lib.Lock;
Namet.Lock;
Nlists.Lock;
Sem.Lock;
Sinput.Lock;
Stringt.Lock;
-- Here we call the back end to generate the output code
Generating_Code := True;
Back_End.Call_Back_End (Back_End_Mode);
-- Once the backend is complete, we unlock the names table. This call
-- allows a few extra entries, needed for example for the file name
-- for the library file output.
Namet.Unlock;
-- Generate the call-graph output of dispatching calls
Exp_CG.Generate_CG_Output;
-- Perform post compilation validation checks
Post_Compilation_Validation_Checks;
-- Now we complete output of errors, rep info and the tree info. These
-- are delayed till now, since it is perfectly possible for gigi to
-- generate errors, modify the tree (in particular by setting flags
-- indicating that elaboration is required, and also to back annotate
-- representation information for List_Rep_Info).
Errout.Finalize (Last_Call => True);
Errout.Output_Messages;
Repinfo.List_Rep_Info (Ttypes.Bytes_Big_Endian);
Inline.List_Inlining_Info;
-- Only write the library if the backend did not generate any error
-- messages. Otherwise signal errors to the driver program so that
-- there will be no attempt to generate an object file.
if Compilation_Errors then
Treepr.Tree_Dump;
Exit_Program (E_Errors);
end if;
if not GNATprove_Mode then
Write_ALI (Object => (Back_End_Mode = Generate_Object));
end if;
if not Compilation_Errors then
-- In case of ada backends, we need to make sure that the generated
-- object file has a timestamp greater than the ALI file. We do this
-- to make gnatmake happy when checking the ALI and obj timestamps,
-- where it expects the object file being written after the ali file.
-- Gnatmake's assumption is true for gcc platforms where the gcc
-- wrapper needs to call the assembler after calling gnat1, but is
-- not true for ada backends, where the object files are created
-- directly by gnat1 (so are created before the ali file).
Back_End.Gen_Or_Update_Object_File;
end if;
-- Generate ASIS tree after writing the ALI file, since in ASIS mode,
-- Write_ALI may in fact result in further tree decoration from the
-- original tree file. Note that we dump the tree just before generating
-- it, so that the dump will exactly reflect what is written out.
Treepr.Tree_Dump;
Tree_Gen;
-- Finalize name table and we are all done
Namet.Finalize;
exception
-- Handle fatal internal compiler errors
when Rtsfind.RE_Not_Available =>
Comperr.Compiler_Abort ("RE_Not_Available");
when System.Assertions.Assert_Failure =>
Comperr.Compiler_Abort ("Assert_Failure");
when Constraint_Error =>
Comperr.Compiler_Abort ("Constraint_Error");
when Program_Error =>
Comperr.Compiler_Abort ("Program_Error");
-- Assume this is a bug. If it is real, the message will in any case
-- say Storage_Error, giving a strong hint.
when Storage_Error =>
Comperr.Compiler_Abort ("Storage_Error");
when Unrecoverable_Error =>
raise;
when others =>
Comperr.Compiler_Abort ("exception");
end;
<<End_Of_Program>>
null;
-- The outer exception handler handles an unrecoverable error
exception
when Unrecoverable_Error =>
Errout.Finalize (Last_Call => True);
Errout.Output_Messages;
Set_Standard_Error;
Write_Str ("compilation abandoned");
Write_Eol;
Set_Standard_Output;
Source_Dump;
Tree_Dump;
Exit_Program (E_Errors);
end Gnat1drv;
|