aboutsummaryrefslogtreecommitdiffstats
path: root/src/ghdldrv/ghdllocal.adb
blob: fbc27087ed16545ebf2db62bc3ec6e65c002bb21 (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
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
--  GHDL driver - local commands.
--  Copyright (C) 2002, 2003, 2004, 2005 Tristan Gingold
--
--  GHDL is free software; you can redistribute it and/or modify it under
--  the terms of the GNU General Public License as published by the Free
--  Software Foundation; either version 2, or (at your option) any later
--  version.
--
--  GHDL is distributed in the hope that it will be useful, but WITHOUT 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
--  along with GCC; see the file COPYING.  If not, write to the Free
--  Software Foundation, 59 Temple Place - Suite 330, Boston, MA
--  02111-1307, USA.
with Ada.Text_IO; use Ada.Text_IO;
with Ada.Command_Line;
with GNAT.Directory_Operations;
with Types; use Types;
with Libraries;
with Std_Package;
with Flags;
with Name_Table;
with Std_Names;
with Disp_Vhdl;
with Default_Paths;
with Scanner;
with Errorout;
with Configuration;
with Files_Map;
with Options;
with Iirs_Utils; use Iirs_Utils;

package body Ghdllocal is
   --  Version of the IEEE library to use.  This just change paths.
   type Ieee_Lib_Kind is (Lib_Standard, Lib_None, Lib_Synopsys, Lib_Mentor);
   Flag_Ieee : Ieee_Lib_Kind;

   --  If TRUE, generate 32bits code on 64bits machines.
   Flag_32bit : Boolean := False;

   procedure Compile_Init is
   begin
      Options.Initialize;
      Flag_Ieee := Lib_Standard;
      Flag_Verbose := False;
   end Compile_Init;

   procedure Init (Cmd : in out Command_Lib)
   is
      pragma Unreferenced (Cmd);
   begin
      Compile_Init;
   end Init;

   function Decode_Driver_Option (Option : String) return Boolean
   is
      subtype Opt_String is String (1 .. Option'Length);
      Opt : Opt_String renames Option;
   begin
      if Opt = "-v" and then Flag_Verbose = False then
         Flag_Verbose := True;
         return True;
      elsif Opt'Length > 9 and then Opt (1 .. 9) = "--PREFIX=" then
         Switch_Prefix_Path := new String'(Opt (10 .. Opt'Last));
         return True;
      elsif Opt = "--ieee=synopsys" then
         Flag_Ieee := Lib_Synopsys;
         return True;
      elsif Opt = "--ieee=mentor" then
         Flag_Ieee := Lib_Mentor;
         return True;
      elsif Opt = "--ieee=none" then
         Flag_Ieee := Lib_None;
         return True;
      elsif Opt = "--ieee=standard" then
         Flag_Ieee := Lib_Standard;
         return True;
      elsif Opt = "-m32" then
         Flag_32bit := True;
         return True;
      elsif Opt'Length >= 2
        and then (Opt (2) = 'g' or Opt (2) = 'O')
      then
         --  Silently accept -g and -O.
         return True;
      else
         return Options.Parse_Option (Opt);
      end if;
   end Decode_Driver_Option;

   procedure Decode_Option (Cmd : in out Command_Lib;
                            Option : String;
                            Arg : String;
                            Res : out Option_Res)
   is
      pragma Unreferenced (Cmd);
      pragma Unreferenced (Arg);
   begin
      if Decode_Driver_Option (Option) then
         Res := Option_Ok;
      else
         Res := Option_Bad;
      end if;
   end Decode_Option;

   procedure Disp_Long_Help (Cmd : Command_Lib)
   is
      pragma Unreferenced (Cmd);
      procedure P (Str : String) renames Put_Line;
   begin
      P ("Main options (try --options-help for details):");
      P (" --std=XX       Use XX as VHDL standard (87,93c,93,00,02 or 08)");
      P (" --work=NAME    Set the name of the WORK library");
      P (" -PDIR          Add DIR in the library search path");
      P (" --workdir=DIR  Specify the directory of the WORK library");
      P (" --PREFIX=DIR   Specify installation prefix");
      P (" --ieee=NAME    Use NAME as ieee library, where name is:");
      P ("    standard: standard version (default)");
      P ("    synopsys, mentor: vendor version (not advised)");
      P ("    none: do not use a predefined ieee library");
   end Disp_Long_Help;

   function Is_Directory_Separator (C : Character) return Boolean is
   begin
      return C = '/' or else C = Directory_Separator;
   end Is_Directory_Separator;

   function Get_Basename_Pos (Pathname : String) return Natural is
   begin
      for I in reverse Pathname'Range loop
         if Is_Directory_Separator (Pathname (I)) then
            return I;
         end if;
      end loop;
      return Pathname'First - 1;
   end Get_Basename_Pos;

   function Is_Basename (Pathname : String) return Boolean is
   begin
      return Get_Basename_Pos (Pathname) < Pathname'First;
   end Is_Basename;

   --  Simple lower case conversion, used to compare with "bin".
   function To_Lower (S : String) return String
   is
      Res : String (S'Range);
      C : Character;
   begin
      for I in S'Range loop
         C := S (I);
         if C >= 'A' and then C <= 'Z' then
            C := Character'Val
              (Character'Pos (C) - Character'Pos ('A') + Character'Pos ('a'));
         end if;
         Res (I) := C;
      end loop;
      return Res;
   end To_Lower;

   procedure Set_Prefix_From_Program_Path (Prog_Path : String)
   is
      Last : Natural;
   begin
      Last := Get_Basename_Pos (Prog_Path);
      if Last < Prog_Path'First then
         --  No directory in Prog_Path.  This is not expected.
         return;
      end if;

      declare
         Pathname : String :=
           Normalize_Pathname (Prog_Path (Last + 1 .. Prog_Path'Last),
                               Prog_Path (Prog_Path'First .. Last - 1));
         Pos : Natural;
      begin
         --  Stop now in case of error.
         if Pathname'Length = 0 then
            return;
         end if;

         --  Skip executable name
         Last := Get_Basename_Pos (Pathname);
         if Last < Pathname'First then
            return;
         end if;

         --  Simplify path:
         --    /./ => /
         --    // => /
         Pos := Last - 1;
         while Pos >= Pathname'First loop
            if Is_Directory_Separator (Pathname (Pos)) then
               if Is_Directory_Separator (Pathname (Pos + 1)) then
                  --  // => /
                  Pathname (Pos .. Last - 1) := Pathname (Pos + 1 .. Last);
                  Last := Last - 1;
               elsif Pos + 2 <= Last
                 and then Pathname (Pos + 1) = '.'
                 and then Is_Directory_Separator (Pathname (Pos + 2))
               then
                  --  /./ => /
                  Pathname (Pos .. Last - 2) := Pathname (Pos + 2 .. Last);
                  Last := Last - 2;
               end if;
            end if;
            Pos := Pos - 1;
         end loop;

         --  Simplify path:
         --    /xxx/../ => /
         --  Do it forward as xxx/../../ must not be simplified as xxx/
         --  This is done after the previous simplification to avoid to deal
         --  with cases like /xxx//../ or /xxx/./../
         Pos := Pathname'First;
         while Pos <= Last - 3 loop
            if Is_Directory_Separator (Pathname (Pos))
              and then Pathname (Pos + 1) = '.'
              and then Pathname (Pos + 2) = '.'
              and then Is_Directory_Separator (Pathname (Pos + 3))
            then
               declare
                  Last_Dir : Natural;
                  Len : Natural;
               begin
                  --  Search backward
                  Last_Dir := Pos;
                  loop
                     if Last_Dir = Pathname'First then
                        Last_Dir := Pos;
                        exit;
                     end if;
                     Last_Dir := Last_Dir - 1;
                     exit when Is_Directory_Separator (Pathname (Last_Dir));
                  end loop;

                  --  /xxxxxxxxxx/../
                  --  ^          ^
                  --  Last_Dir   Pos
                  Len := Pos + 3 - Last_Dir;
                  Pathname (Last_Dir + 1 .. Last - Len) :=
                    Pathname (Pos + 4 .. Last);
                  Last := Last - Len;
                  Pos := Last_Dir;
               end;
            else
               Pos := Pos + 1;
            end if;
         end loop;

         --  Remove last '/'
         Last := Last - 1;

         --  Skip '/bin' directory if present
         Pos := Get_Basename_Pos (Pathname (Pathname'First .. Last));
         if Pos < Pathname'First then
            return;
         end if;
         if To_Lower (Pathname (Pos + 1 .. Last)) = "bin" then
            Last := Pos - 1;
         end if;

         Exec_Prefix := new String'(Pathname (Pathname'First .. Last));
      end;
   end Set_Prefix_From_Program_Path;

   --  Extract Exec_Prefix from executable name.
   procedure Set_Exec_Prefix
   is
      use GNAT.Directory_Operations;
      Prog_Path : constant String := Ada.Command_Line.Command_Name;
      Exec_Path : String_Access;
   begin
      --  If the command name is an absolute path, deduce prefix from it.
      if Is_Absolute_Path (Prog_Path) then
         Set_Prefix_From_Program_Path (Prog_Path);
         return;
      end if;

      --  If the command name is a relative path, deduce prefix from it
      --  and current path.
      if not Is_Basename (Prog_Path) then
         if Is_Executable_File (Prog_Path) then
            Set_Prefix_From_Program_Path
              (Get_Current_Dir & Directory_Separator & Prog_Path);
         end if;
         return;
      end if;

      --  Look for program name on the path.
      Exec_Path := Locate_Exec_On_Path (Prog_Path);
      if Exec_Path /= null then
         Set_Prefix_From_Program_Path (Exec_Path.all);
         Free (Exec_Path);
      end if;
   end Set_Exec_Prefix;

   function Get_Version_Path return String
   is
      use Flags;
   begin
      case Vhdl_Std is
         when Vhdl_87 =>
            return "v87";
         when Vhdl_93c
           | Vhdl_93
           | Vhdl_00
           | Vhdl_02 =>
            return "v93";
         when Vhdl_08 =>
            return "v08";
      end case;
   end Get_Version_Path;

   function Get_Machine_Path_Prefix return String is
   begin
      if Flag_32bit then
         return Lib_Prefix_Path.all & "32";
      else
         return Lib_Prefix_Path.all;
      end if;
   end Get_Machine_Path_Prefix;

   procedure Add_Library_Name (Name : String)
   is
      Path : constant String := Get_Machine_Path_Prefix & Directory_Separator
        & Name & Directory_Separator & Get_Version_Path & Directory_Separator;
   begin
      if not Is_Directory (Path) then
         Warning
           ("library " & Name & " does not exists for " & Get_Version_Path);
      end if;
      Libraries.Add_Library_Path (Path);
   end Add_Library_Name;

   procedure Setup_Libraries (Load : Boolean)
   is
      use Flags;
   begin
      --  Get environment variable.
      Prefix_Env := GNAT.OS_Lib.Getenv ("GHDL_PREFIX");
      if Prefix_Env = null or else Prefix_Env.all = "" then
         Prefix_Env := null;
      end if;

      --  Compute Exec_Prefix.
      Set_Exec_Prefix;

      --  Set prefix path.
      --  If not set by command line, try environment variable.
      if Switch_Prefix_Path /= null then
         Lib_Prefix_Path := Switch_Prefix_Path;
      else
         Lib_Prefix_Path := Prefix_Env;
      end if;
      --  Else try default path.
      if Lib_Prefix_Path = null then
         if Is_Absolute_Path (Default_Paths.Lib_Prefix) then
            Lib_Prefix_Path := new String'(Default_Paths.Lib_Prefix);
         else
            if Exec_Prefix /= null then
               Lib_Prefix_Path := new
                 String'(Exec_Prefix.all & Directory_Separator
                           & Default_Paths.Lib_Prefix);
            end if;
            if Lib_Prefix_Path = null
              or else not Is_Directory (Lib_Prefix_Path.all)
            then
               Free (Lib_Prefix_Path);
               Lib_Prefix_Path := new
                 String'(Default_Paths.Install_Prefix
                           & Directory_Separator
                           & Default_Paths.Lib_Prefix);
            end if;
         end if;
      else
         -- Assume the user has set the correct path, so do not insert 32.
         Flag_32bit := False;
      end if;

      --  Add paths for predefined libraries.
      if not Flags.Bootstrap then
         case Flag_Ieee is
            when Lib_Standard =>
               Add_Library_Name ("ieee");
            when Lib_Synopsys =>
               Add_Library_Name ("synopsys");
            when Lib_Mentor =>
               if Vhdl_Std >= Vhdl_08 then
                  Warning ("--ieee=mentor is ignored for --std=08");
               else
                  Add_Library_Name ("mentor");
               end if;
            when Lib_None =>
               null;
         end case;

         --  For std: just add the library prefix.
         Libraries.Add_Library_Path
           (Get_Machine_Path_Prefix & Directory_Separator);
      end if;
      if Load then
         Libraries.Load_Std_Library;
         Libraries.Load_Work_Library;
      end if;
   end Setup_Libraries;

   procedure Disp_Config_Prefixes is
   begin
      Put ("command line prefix (--PREFIX): ");
      if Switch_Prefix_Path = null then
         Put_Line ("(not set)");
      else
         Put_Line (Switch_Prefix_Path.all);
      end if;

      Put ("environment prefix (GHDL_PREFIX): ");
      if Prefix_Env = null then
         Put_Line ("(not set)");
      else
         Put_Line (Prefix_Env.all);
      end if;

      Setup_Libraries (False);

      Put ("exec prefix (from program name): ");
      if Exec_Prefix = null then
         Put_Line ("(not found)");
      else
         Put_Line (Exec_Prefix.all);
      end if;

      New_Line;

      Put_Line ("library prefix: " & Lib_Prefix_Path.all);
      Put ("library directory: ");
      Put_Line (Get_Machine_Path_Prefix);
   end Disp_Config_Prefixes;

   procedure Disp_Library_Unit (Unit : Iir)
   is
      use Name_Table;
      Id : Name_Id;
   begin
      Id := Get_Identifier (Unit);
      case Get_Kind (Unit) is
         when Iir_Kind_Entity_Declaration =>
            Put ("entity ");
         when Iir_Kind_Architecture_Body =>
            Put ("architecture ");
         when Iir_Kind_Configuration_Declaration =>
            Put ("configuration ");
         when Iir_Kind_Package_Declaration =>
            Put ("package ");
         when Iir_Kind_Package_Instantiation_Declaration =>
            Put ("package instance ");
         when Iir_Kind_Package_Body =>
            Put ("package body ");
         when Iir_Kind_Context_Declaration =>
            Put ("context ");
         when others =>
            Put ("???");
            return;
      end case;
      Put (Image (Id));
      case Get_Kind (Unit) is
         when Iir_Kind_Architecture_Body =>
            Put (" of ");
            Put (Image (Get_Entity_Identifier_Of_Architecture (Unit)));
         when Iir_Kind_Configuration_Declaration =>
            if Id = Null_Identifier then
               Put ("<default> of entity ");
               Put (Image (Get_Entity_Identifier_Of_Architecture (Unit)));
            end if;
         when others =>
            null;
      end case;
   end Disp_Library_Unit;

   procedure Disp_Library (Name : Name_Id)
   is
      use Libraries;
      Lib : Iir_Library_Declaration;
      File : Iir_Design_File;
      Unit : Iir;
   begin
      if Name = Std_Names.Name_Work then
         Lib := Work_Library;
      elsif Name = Std_Names.Name_Std then
         Lib := Std_Library;
      else
         Lib := Get_Library (Name, Command_Line_Location);
      end if;

      --  Disp contents of files.
      File := Get_Design_File_Chain (Lib);
      while File /= Null_Iir loop
         Unit := Get_First_Design_Unit (File);
         while Unit /= Null_Iir loop
            Disp_Library_Unit (Get_Library_Unit (Unit));
            New_Line;
            Unit := Get_Chain (Unit);
         end loop;
         File := Get_Chain (File);
      end loop;
   end Disp_Library;

   --  Return FILENAME without the extension.
   function Get_Base_Name (Filename : String; Remove_Dir : Boolean := True)
                           return String
   is
      First : Natural;
      Last : Natural;
   begin
      First := Filename'First;
      Last := Filename'Last;
      for I in Filename'Range loop
         if Filename (I) = '.' then
            Last := I - 1;
         elsif Remove_Dir and then Is_Directory_Separator (Filename (I)) then
            First := I + 1;
            Last := Filename'Last;
         end if;
      end loop;
      return Filename (First .. Last);
   end Get_Base_Name;

   function Append_Suffix
     (File : String; Suffix : String; In_Work : Boolean := True)
     return String_Access
   is
      use Name_Table;
   begin
      if In_Work then
         return new String'(Image (Libraries.Work_Directory)
                              & Get_Base_Name (File) & Suffix);
      else
         return new String'(File & Suffix);
      end if;
   end Append_Suffix;


   --  Command Dir.
   type Command_Dir is new Command_Lib with null record;
   function Decode_Command (Cmd : Command_Dir; Name : String) return Boolean;
   function Get_Short_Help (Cmd : Command_Dir) return String;
   procedure Perform_Action (Cmd : in out Command_Dir; Args : Argument_List);

   function Decode_Command (Cmd : Command_Dir; Name : String) return Boolean
   is
      pragma Unreferenced (Cmd);
   begin
      --  '-d' is for compatibility.
      return Name = "-d" or else Name = "--dir";
   end Decode_Command;

   function Get_Short_Help (Cmd : Command_Dir) return String
   is
      pragma Unreferenced (Cmd);
   begin
      return "--dir [LIBs]       Disp contents of the libraries";
   end Get_Short_Help;

   procedure Perform_Action (Cmd : in out Command_Dir; Args : Argument_List)
   is
      pragma Unreferenced (Cmd);
   begin
      Setup_Libraries (True);

      if Args'Length = 0 then
         Disp_Library (Std_Names.Name_Work);
      else
         for I in Args'Range loop
            Disp_Library (Name_Table.Get_Identifier (Args (I).all));
         end loop;
      end if;
   end Perform_Action;

   --  Command Find.
   type Command_Find is new Command_Lib with null record;
   function Decode_Command (Cmd : Command_Find; Name : String) return Boolean;
   function Get_Short_Help (Cmd : Command_Find) return String;
   procedure Perform_Action (Cmd : in out Command_Find; Args : Argument_List);

   function Decode_Command (Cmd : Command_Find; Name : String) return Boolean
   is
      pragma Unreferenced (Cmd);
   begin
      return Name = "-f";
   end Decode_Command;

   function Get_Short_Help (Cmd : Command_Find) return String
   is
      pragma Unreferenced (Cmd);
   begin
      return "-f FILEs           Disp units in FILES";
   end Get_Short_Help;

   --  Return TRUE is UNIT can be at the apex of a design hierarchy.
   function Is_Top_Entity (Unit : Iir) return Boolean
   is
   begin
      if Get_Kind (Unit) /= Iir_Kind_Entity_Declaration then
         return False;
      end if;
      if Get_Port_Chain (Unit) /= Null_Iir then
         return False;
      end if;
      if Get_Generic_Chain (Unit) /= Null_Iir then
         return False;
      end if;
      return True;
   end Is_Top_Entity;

   --  Disp contents design files FILES.
   procedure Perform_Action (Cmd : in out Command_Find; Args : Argument_List)
   is
      pragma Unreferenced (Cmd);

      use Name_Table;
      Id : Name_Id;
      Design_File : Iir_Design_File;
      Unit : Iir;
      Lib : Iir;
      Flag_Add : constant Boolean := False;
   begin
      Flags.Bootstrap := True;
      Libraries.Load_Std_Library;
      Libraries.Load_Work_Library;

      for I in Args'Range loop
         Id := Get_Identifier (Args (I).all);
         Design_File := Libraries.Load_File (Id);
         if Design_File /= Null_Iir then
            Unit := Get_First_Design_Unit (Design_File);
            while Unit /= Null_Iir loop
               Lib := Get_Library_Unit (Unit);
               Disp_Library_Unit (Lib);
               if Is_Top_Entity (Lib) then
                  Put (" **");
               end if;
               New_Line;
               if Flag_Add then
                  Libraries.Add_Design_Unit_Into_Library (Unit);
               end if;
               Unit := Get_Chain (Unit);
            end loop;
         end if;
      end loop;
      if Flag_Add then
         Libraries.Save_Work_Library;
      end if;
   end Perform_Action;

   --  Command Import.
   type Command_Import is new Command_Lib with null record;
   function Decode_Command (Cmd : Command_Import; Name : String)
                           return Boolean;
   function Get_Short_Help (Cmd : Command_Import) return String;
   procedure Perform_Action (Cmd : in out Command_Import;
                             Args : Argument_List);

   function Decode_Command (Cmd : Command_Import; Name : String)
                           return Boolean
   is
      pragma Unreferenced (Cmd);
   begin
      return Name = "-i";
   end Decode_Command;

   function Get_Short_Help (Cmd : Command_Import) return String
   is
      pragma Unreferenced (Cmd);
   begin
      return "-i [OPTS] FILEs    Import units of FILEs";
   end Get_Short_Help;

   procedure Perform_Action (Cmd : in out Command_Import; Args : Argument_List)
   is
      pragma Unreferenced (Cmd);
      use Errorout;

      Id : Name_Id;
      Design_File : Iir_Design_File;
      Unit : Iir;
      Next_Unit : Iir;
      Lib : Iir;
   begin
      Setup_Libraries (True);

      --  Parse all files.
      for I in Args'Range loop
         Id := Name_Table.Get_Identifier (Args (I).all);
         Design_File := Libraries.Load_File (Id);
         if Design_File /= Null_Iir then
            Unit := Get_First_Design_Unit (Design_File);
            while Unit /= Null_Iir loop
               if Flag_Verbose then
                  Lib := Get_Library_Unit (Unit);
                  Disp_Library_Unit (Lib);
                  if Is_Top_Entity (Lib) then
                     Put (" **");
                  end if;
                  New_Line;
               end if;
               Next_Unit := Get_Chain (Unit);
               Set_Chain (Unit, Null_Iir);
               Libraries.Add_Design_Unit_Into_Library (Unit);
               Unit := Next_Unit;
            end loop;
         end if;
      end loop;

      if Nbr_Errors > 0 then
         raise Compilation_Error;
      end if;

      --  Analyze all files.
      if False then
         Design_File := Get_Design_File_Chain (Libraries.Work_Library);
         while Design_File /= Null_Iir loop
            Unit := Get_First_Design_Unit (Design_File);
            while Unit /= Null_Iir loop
               case Get_Date (Unit) is
                  when Date_Valid
                    | Date_Analyzed =>
                     null;
                  when Date_Parsed =>
                     Libraries.Finish_Compilation (Unit, False);
                  when others =>
                     raise Internal_Error;
               end case;
               Unit := Get_Chain (Unit);
            end loop;
            Design_File := Get_Chain (Design_File);
         end loop;
      end if;

      Libraries.Save_Work_Library;
   exception
      when Compilation_Error =>
         Error ("importation has failed due to compilation error");
         raise;
   end Perform_Action;

   --  Command Check_Syntax.
   type Command_Check_Syntax is new Command_Lib with null record;
   function Decode_Command (Cmd : Command_Check_Syntax; Name : String)
                           return Boolean;
   function Get_Short_Help (Cmd : Command_Check_Syntax) return String;
   procedure Perform_Action (Cmd : in out Command_Check_Syntax;
                             Args : Argument_List);

   function Decode_Command (Cmd : Command_Check_Syntax; Name : String)
                           return Boolean
   is
      pragma Unreferenced (Cmd);
   begin
      return Name = "-s";
   end Decode_Command;

   function Get_Short_Help (Cmd : Command_Check_Syntax) return String
   is
      pragma Unreferenced (Cmd);
   begin
      return "-s [OPTS] FILEs    Check syntax of FILEs";
   end Get_Short_Help;

   procedure Analyze_One_File (File_Name : String)
   is
      Id : Name_Id;
      Design_File : Iir_Design_File;
      Unit : Iir;
      Next_Unit : Iir;
   begin
      Id := Name_Table.Get_Identifier (File_Name);
      if Flag_Verbose then
         Put (File_Name);
         Put_Line (":");
      end if;
      Design_File := Libraries.Load_File (Id);
      if Design_File = Null_Iir then
         raise Errorout.Compilation_Error;
      end if;

      Unit := Get_First_Design_Unit (Design_File);
      while Unit /= Null_Iir loop
         if Flag_Verbose then
            Put (' ');
            Disp_Library_Unit (Get_Library_Unit (Unit));
            New_Line;
         end if;
         -- Sem, canon, annotate a design unit.
         Libraries.Finish_Compilation (Unit, True);

         Next_Unit := Get_Chain (Unit);
         if Errorout.Nbr_Errors = 0 then
            Set_Chain (Unit, Null_Iir);
            Libraries.Add_Design_Unit_Into_Library (Unit);
         end if;

         Unit := Next_Unit;
      end loop;

      if Errorout.Nbr_Errors > 0 then
         raise Errorout.Compilation_Error;
      end if;
   end Analyze_One_File;

   procedure Analyze_Files (Files : Argument_List; Save_Library : Boolean) is
   begin
      Setup_Libraries (True);

      --  Parse all files.
      for I in Files'Range loop
         Analyze_One_File (Files (I).all);
      end loop;

      if Save_Library then
         Libraries.Save_Work_Library;
      end if;
   end Analyze_Files;

   procedure Perform_Action (Cmd : in out Command_Check_Syntax;
                             Args : Argument_List)
   is
      pragma Unreferenced (Cmd);
   begin
      Analyze_Files (Args, False);
   end Perform_Action;

   --  Command --clean: remove object files.
   type Command_Clean is new Command_Lib with null record;
   function Decode_Command (Cmd : Command_Clean; Name : String) return Boolean;
   function Get_Short_Help (Cmd : Command_Clean) return String;
   procedure Perform_Action (Cmd : in out Command_Clean; Args : Argument_List);

   function Decode_Command (Cmd : Command_Clean; Name : String) return Boolean
   is
      pragma Unreferenced (Cmd);
   begin
      return Name = "--clean";
   end Decode_Command;

   function Get_Short_Help (Cmd : Command_Clean) return String
   is
      pragma Unreferenced (Cmd);
   begin
      return "--clean            Remove generated files";
   end Get_Short_Help;

   procedure Delete (Str : String)
   is
      Status : Boolean;
   begin
      Delete_File (Str'Address, Status);
      if Flag_Verbose and Status then
         Put_Line ("delete " & Str (Str'First .. Str'Last - 1));
      end if;
   end Delete;

   procedure Perform_Action (Cmd : in out Command_Clean; Args : Argument_List)
   is
      pragma Unreferenced (Cmd);
      use Name_Table;

      Obj_Suffix : constant String_Access := Get_Object_Suffix;
      Exec_Suffix : constant String_Access := Get_Executable_Suffix;

      procedure Delete_Asm_Obj (Str : String) is
      begin
         Delete (Str & Obj_Suffix.all & Nul);
         Delete (Str & Asm_Suffix & Nul);
      end Delete_Asm_Obj;

      procedure Delete_Top_Unit (Str : String) is
      begin
         --  Delete elaboration file
         Delete_Asm_Obj (Elab_Prefix & Str);

         --  Delete file list.
         Delete (Str & List_Suffix & Nul);

         --  Delete executable.
         Delete (Str & Exec_Suffix.all & Nul);
      end Delete_Top_Unit;

      File : Iir_Design_File;
      Design_Unit : Iir_Design_Unit;
      Lib_Unit : Iir;
      Str : String_Access;
   begin
      if Args'Length /= 0 then
         Error ("command '--clean' does not accept any argument");
         raise Option_Error;
      end if;

      Flags.Bootstrap := True;
      --  Load libraries.
      Libraries.Load_Std_Library;
      Libraries.Load_Work_Library;

      File := Get_Design_File_Chain (Libraries.Work_Library);
      while File /= Null_Iir loop
         --  Delete compiled file.
         Str := Append_Suffix (Image (Get_Design_File_Filename (File)), "");
         Delete_Asm_Obj (Str.all);
         Free (Str);

         --  Try any possible top-level names
         Design_Unit := Get_First_Design_Unit (File);
         while Design_Unit /= Null_Iir loop
            Lib_Unit := Get_Library_Unit (Design_Unit);
            case Get_Kind (Lib_Unit) is
               when Iir_Kind_Entity_Declaration
                 | Iir_Kind_Configuration_Declaration =>
                  Delete_Top_Unit (Image (Get_Identifier (Lib_Unit)));
               when Iir_Kind_Architecture_Body =>
                  Delete_Top_Unit
                    (Image (Get_Entity_Identifier_Of_Architecture (Lib_Unit))
                       & '-'
                       & Image (Get_Identifier (Lib_Unit)));
               when others =>
                  null;
            end case;
            Design_Unit := Get_Chain (Design_Unit);
         end loop;
         File := Get_Chain (File);
      end loop;
   end Perform_Action;

   --  Command --remove: remove object file and library file.
   type Command_Remove is new Command_Clean with null record;
   function Decode_Command (Cmd : Command_Remove; Name : String)
                           return Boolean;
   function Get_Short_Help (Cmd : Command_Remove) return String;
   procedure Perform_Action (Cmd : in out Command_Remove;
                             Args : Argument_List);

   function Decode_Command (Cmd : Command_Remove; Name : String) return Boolean
   is
      pragma Unreferenced (Cmd);
   begin
      return Name = "--remove";
   end Decode_Command;

   function Get_Short_Help (Cmd : Command_Remove) return String
   is
      pragma Unreferenced (Cmd);
   begin
      return "--remove           Remove generated files and library file";
   end Get_Short_Help;

   procedure Perform_Action (Cmd : in out Command_Remove; Args : Argument_List)
   is
      use Name_Table;
   begin
      if Args'Length /= 0 then
         Error ("command '--remove' does not accept any argument");
         raise Option_Error;
      end if;
      Perform_Action (Command_Clean (Cmd), Args);
      Delete (Image (Libraries.Work_Directory)
              & Libraries.Library_To_File_Name (Libraries.Work_Library)
              & Nul);
   end Perform_Action;

   --  Command --copy: copy work library to current directory.
   type Command_Copy is new Command_Lib with null record;
   function Decode_Command (Cmd : Command_Copy; Name : String) return Boolean;
   function Get_Short_Help (Cmd : Command_Copy) return String;
   procedure Perform_Action (Cmd : in out Command_Copy; Args : Argument_List);

   function Decode_Command (Cmd : Command_Copy; Name : String) return Boolean
   is
      pragma Unreferenced (Cmd);
   begin
      return Name = "--copy";
   end Decode_Command;

   function Get_Short_Help (Cmd : Command_Copy) return String
   is
      pragma Unreferenced (Cmd);
   begin
      return "--copy             Copy work library to current directory";
   end Get_Short_Help;

   procedure Perform_Action (Cmd : in out Command_Copy; Args : Argument_List)
   is
      pragma Unreferenced (Cmd);
      use Name_Table;
      use Libraries;

      File : Iir_Design_File;
      Dir : Name_Id;
   begin
      if Args'Length /= 0 then
         Error ("command '--copy' does not accept any argument");
         raise Option_Error;
      end if;

      Setup_Libraries (False);
      Libraries.Load_Std_Library;
      Dir := Work_Directory;
      Work_Directory := Null_Identifier;
      Libraries.Load_Work_Library;
      Work_Directory := Dir;

      Dir := Get_Library_Directory (Libraries.Work_Library);
      if Dir = Name_Nil or else Dir = Files_Map.Get_Home_Directory then
         Error ("cannot copy library on itself (use --remove first)");
         raise Option_Error;
      end if;

      File := Get_Design_File_Chain (Libraries.Work_Library);
      while File /= Null_Iir loop
         --  Copy object files (if any).
         declare
            Basename : constant String :=
              Get_Base_Name (Image (Get_Design_File_Filename (File)));
            Src : String_Access;
            Dst : String_Access;
            Success : Boolean;
            pragma Unreferenced (Success);
         begin
            Src := new String'(Image (Dir) & Basename & Get_Object_Suffix.all);
            Dst := new String'(Basename & Get_Object_Suffix.all);
            Copy_File (Src.all, Dst.all, Success, Overwrite, Full);
            --  Be silent in case of error.
            Free (Src);
            Free (Dst);
         end;
         if Get_Design_File_Directory (File) = Name_Nil then
            Set_Design_File_Directory (File, Dir);
         end if;

         File := Get_Chain (File);
      end loop;
      Libraries.Work_Directory := Name_Nil;
      Libraries.Save_Work_Library;
   end Perform_Action;

   --  Command --disp-standard.
   type Command_Disp_Standard is new Command_Lib with null record;
   function Decode_Command (Cmd : Command_Disp_Standard; Name : String)
                           return Boolean;
   function Get_Short_Help (Cmd : Command_Disp_Standard) return String;
   procedure Perform_Action (Cmd : in out Command_Disp_Standard;
                             Args : Argument_List);

   function Decode_Command (Cmd : Command_Disp_Standard; Name : String)
                           return Boolean
   is
      pragma Unreferenced (Cmd);
   begin
      return Name = "--disp-standard";
   end Decode_Command;

   function Get_Short_Help (Cmd : Command_Disp_Standard) return String
   is
      pragma Unreferenced (Cmd);
   begin
      return "--disp-standard    Disp std.standard in pseudo-vhdl";
   end Get_Short_Help;

   procedure Perform_Action (Cmd : in out Command_Disp_Standard;
                             Args : Argument_List)
   is
      pragma Unreferenced (Cmd);
   begin
      if Args'Length /= 0 then
         Error ("command '--disp-standard' does not accept any argument");
         raise Option_Error;
      end if;
      Flags.Bootstrap := True;
      Libraries.Load_Std_Library;
      Disp_Vhdl.Disp_Vhdl (Std_Package.Std_Standard_Unit);
   end Perform_Action;

   --  Command --find-top.
   type Command_Find_Top is new Command_Lib with null record;
   function Decode_Command (Cmd : Command_Find_Top; Name : String)
                           return Boolean;
   function Get_Short_Help (Cmd : Command_Find_Top) return String;
   procedure Perform_Action (Cmd : in out Command_Find_Top;
                             Args : Argument_List);

   function Decode_Command (Cmd : Command_Find_Top; Name : String)
                           return Boolean
   is
      pragma Unreferenced (Cmd);
   begin
      return Name = "--find-top";
   end Decode_Command;

   function Get_Short_Help (Cmd : Command_Find_Top) return String
   is
      pragma Unreferenced (Cmd);
   begin
      return "--find-top         Disp possible top entity in work library";
   end Get_Short_Help;

   procedure Perform_Action (Cmd : in out Command_Find_Top;
                             Args : Argument_List)
   is
      use Libraries;
      pragma Unreferenced (Cmd);
      From : Iir;
      Top : Iir;
   begin
      Setup_Libraries (True);

      if Args'Length = 0 then
         From := Work_Library;
      elsif Args'Length = 1 then
         From := Find_Design_File
           (Work_Library, Name_Table.Get_Identifier (Args (Args'First).all));
         if not Is_Valid (From) then
            Error ("cannot find '" & Args (Args'First).all & "' in library");
            raise Option_Error;
         end if;
      else
         Error ("command '--find-top' accepts at most one argument");
         raise Option_Error;
      end if;

      Top := Configuration.Find_Top_Entity (From);

      if Top = Null_Iir then
         Error ("no top entity found");
      else
         Put_Line (Name_Table.Image (Get_Identifier (Top)));
      end if;
   end Perform_Action;

   --  Command --bug-box.
   type Command_Bug_Box is new Command_Type with null record;
   function Decode_Command (Cmd : Command_Bug_Box; Name : String)
                           return Boolean;
   function Get_Short_Help (Cmd : Command_Bug_Box) return String;
   procedure Perform_Action (Cmd : in out Command_Bug_Box;
                             Args : Argument_List);

   function Decode_Command (Cmd : Command_Bug_Box; Name : String)
                           return Boolean
   is
      pragma Unreferenced (Cmd);
   begin
      return Name = "--bug-box";
   end Decode_Command;

   function Get_Short_Help (Cmd : Command_Bug_Box) return String
   is
      pragma Unreferenced (Cmd);
   begin
      return "!--bug-box          Crash and emit a bug-box";
   end Get_Short_Help;

   procedure Perform_Action (Cmd : in out Command_Bug_Box;
                             Args : Argument_List)
   is
      pragma Unreferenced (Cmd, Args);
   begin
      raise Program_Error;
   end Perform_Action;

   procedure Load_All_Libraries_And_Files
   is
      use Files_Map;
      use Libraries;
      use Errorout;

      procedure Extract_Library_Clauses (Unit : Iir_Design_Unit)
      is
         Lib1 : Iir_Library_Declaration;
         pragma Unreferenced (Lib1);
         Ctxt_Item : Iir;
      begin
         --  Extract library clauses.
         Ctxt_Item := Get_Context_Items (Unit);
         while Ctxt_Item /= Null_Iir loop
            if Get_Kind (Ctxt_Item) = Iir_Kind_Library_Clause then
               Lib1 := Get_Library (Get_Identifier (Ctxt_Item),
                                    Get_Location (Ctxt_Item));
            end if;
            Ctxt_Item := Get_Chain (Ctxt_Item);
         end loop;
      end Extract_Library_Clauses;

      Lib : Iir_Library_Declaration;
      Fe : Source_File_Entry;
      File, Next_File : Iir_Design_File;
      Unit, Next_Unit : Iir_Design_Unit;
      Design_File : Iir_Design_File;

      Old_Work : Iir_Library_Declaration;
   begin
      Lib := Std_Library;
      Lib := Get_Chain (Lib);
      Old_Work := Work_Library;
      while Lib /= Null_Iir loop
         --  Design units are always put in the work library.
         Work_Library := Lib;

         File := Get_Design_File_Chain (Lib);
         while File /= Null_Iir loop
            Next_File := Get_Chain (File);
            Fe := Read_Source_File (Get_Design_File_Directory (File),
                                    Get_Design_File_Filename (File));
            if Fe = No_Source_File_Entry then
               --  FIXME: should remove all the design file from the library.
               null;
            elsif Is_Eq (Get_File_Checksum (Fe),
                         Get_File_Checksum (File))
            then
               --  File has not been modified.
               --  Extract libraries.
               --  Note: we can't parse it only, since we need to keep the
               --    date.
               Unit := Get_First_Design_Unit (File);
               while Unit /= Null_Iir loop
                  Load_Parse_Design_Unit (Unit, Null_Iir);
                  Extract_Library_Clauses (Unit);
                  Unit := Get_Chain (Unit);
               end loop;
            else
               --  File has been modified.
               --  Parse it.
               Design_File := Load_File (Fe);

               --  Exit now in case of parse error.
               if Design_File = Null_Iir
                 or else Nbr_Errors > 0
               then
                  raise Compilation_Error;
               end if;

               Unit := Get_First_Design_Unit (Design_File);
               while Unit /= Null_Iir loop
                  Extract_Library_Clauses (Unit);

                  Next_Unit := Get_Chain (Unit);
                  Set_Chain (Unit, Null_Iir);
                  Add_Design_Unit_Into_Library (Unit);
                  Unit := Next_Unit;
               end loop;
            end if;
            File := Next_File;
         end loop;
         Lib := Get_Chain (Lib);
      end loop;
      Work_Library := Old_Work;
   end Load_All_Libraries_And_Files;

   --  Check the Elab_Flag is not set on design units of LIB.
   procedure Check_No_Elab_Flag (Lib : Iir_Library_Declaration)
   is
      File : Iir_Design_File;
      Unit : Iir_Design_Unit;
   begin
      File := Get_Design_File_Chain (Lib);
      while File /= Null_Iir loop
         Unit := Get_First_Design_Unit (File);
         while Unit /= Null_Iir loop
            if Get_Elab_Flag (Unit) then
               raise Internal_Error;
            end if;
            Unit := Get_Chain (Unit);
         end loop;
         File := Get_Chain (File);
      end loop;
   end Check_No_Elab_Flag;

   function Build_Dependence (Prim : String_Access; Sec : String_Access)
     return Iir_List
   is
      procedure Build_Dependence_List (File : Iir_Design_File; List : Iir_List)
      is
         El : Iir_Design_File;
         Depend_List : Iir_List;
         Depend_It : List_Iterator;
      begin
         if Get_Elab_Flag (File) then
            return;
         end if;

         Set_Elab_Flag (File, True);
         Depend_List := Get_File_Dependence_List (File);
         if Depend_List /= Null_Iir_List then
            Depend_It := List_Iterate (Depend_List);
            while Is_Valid (Depend_It) loop
               El := Get_Element (Depend_It);
               Build_Dependence_List (El, List);
               Next (Depend_It);
            end loop;
         end if;
         Append_Element (List, File);
      end Build_Dependence_List;

      use Configuration;
      use Name_Table;

      Top : Iir;
      Primary_Id : Name_Id;
      Secondary_Id : Name_Id;

      File : Iir_Design_File;
      Unit : Iir;

      Files_List : Iir_List;
   begin
      Check_No_Elab_Flag (Libraries.Work_Library);

      Primary_Id := Get_Identifier (Prim.all);
      if Sec /= null then
         Secondary_Id := Get_Identifier (Sec.all);
      else
         Secondary_Id := Null_Identifier;
      end if;

      if True then
         --  Load the world.
         Load_All_Libraries_And_Files;
      else
         --  Re-parse modified files in order configure could find all design
         --  units.
         declare
            use Files_Map;
            Fe : Source_File_Entry;
            Next_File : Iir_Design_File;
            Design_File : Iir_Design_File;
         begin
            File := Get_Design_File_Chain (Libraries.Work_Library);
            while File /= Null_Iir loop
               Next_File := Get_Chain (File);
               Fe := Read_Source_File (Get_Design_File_Directory (File),
                                       Get_Design_File_Filename (File));
               if Fe = No_Source_File_Entry then
                  --  FIXME: should remove all the design file from
                  --  the library.
                  null;
               else
                  if not Is_Eq (Get_File_Checksum (Fe),
                                Get_File_Checksum (File))
                  then
                     --  FILE has been modified.
                     Design_File := Libraries.Load_File (Fe);
                     if Design_File /= Null_Iir then
                        Libraries.Add_Design_File_Into_Library (Design_File);
                     end if;
                  end if;
               end if;
               File := Next_File;
            end loop;
         end;
      end if;

      Flags.Flag_Elaborate := True;
      Flags.Flag_Elaborate_With_Outdated := True;
      Flag_Load_All_Design_Units := True;
      Flag_Build_File_Dependence := True;

      Top := Configure (Primary_Id, Secondary_Id);
      if Top = Null_Iir then
         --  Error during configuration (primary unit not found).
         raise Option_Error;
      end if;

      --  Add unused design units (and their dependencies).
      declare
         N : Natural;
      begin
         N := Design_Units.First;
         while N <= Design_Units.Last loop
            Unit := Design_Units.Table (N);
            N := N + 1;
            File := Get_Design_File (Unit);
            if not Get_Elab_Flag (File) then
               Set_Elab_Flag (File, True);
               Unit := Get_First_Design_Unit (File);
               while Unit /= Null_Iir loop
                  if not Get_Elab_Flag (Unit) then
                     Add_Design_Unit (Unit, Null_Iir);
                  end if;
                  Unit := Get_Chain (Unit);
               end loop;
            end if;
         end loop;
      end;

      --  Clear elab flag on design files (as it is used by below by
      --  Build_Dependence_List).
      for I in reverse Design_Units.First .. Design_Units.Last loop
         Unit := Design_Units.Table (I);
         File := Get_Design_File (Unit);
         Set_Elab_Flag (File, False);
      end loop;

      --  Create a list of files, from the last to the first.
      Files_List := Create_Iir_List;
      for I in Design_Units.First .. Design_Units.Last loop
         Unit := Design_Units.Table (I);
         File := Get_Design_File (Unit);
         Build_Dependence_List (File, Files_List);
      end loop;

      return Files_List;
   end Build_Dependence;

   function Source_File_Modified (File : Iir_Design_File) return Boolean
   is
      use Files_Map;

      Fe : Source_File_Entry;
   begin
      --  2) file has been modified.
      Fe := Read_Source_File (Get_Design_File_Directory (File),
                              Get_Design_File_Filename (File));
      if not Is_Eq (Get_File_Checksum (Fe),
                    Get_File_Checksum (File))
      then
         if Flag_Verbose then
            Put_Line ("file " & Name_Table.Image (Get_File_Name (Fe))
                        & " has been modified");
         end if;
         return True;
      else
         return False;
      end if;
   end Source_File_Modified;

   function Is_File_Outdated (File : Iir_Design_File) return Boolean
   is
      Unit : Iir;
      Lib_Unit : Iir;
   begin
      Unit := Get_First_Design_Unit (File);
      while Unit /= Null_Iir loop
         Lib_Unit := Get_Library_Unit (Unit);
         if Get_Kind (Lib_Unit) = Iir_Kind_Configuration_Declaration
           and then Get_Identifier (Lib_Unit) = Null_Identifier
         then
            --  Do not consider default configurations (there is no user code
            --  for them).
            null;
         elsif Get_Date (Unit) not in Date_Valid then
            --  Unit not yet analyzed:
            if Flag_Verbose then
               Disp_Library_Unit (Get_Library_Unit (Unit));
               Put_Line (" was not analyzed");
            end if;
            return True;
         else
            --  Check if one of the dependence is newer
            declare
               Depends : constant Iir_List := Get_Dependence_List (Unit);
               Stamp : constant Time_Stamp_Id :=
                 Get_Analysis_Time_Stamp (File);
               Depends_It : List_Iterator;
               El : Iir;
               Dep : Iir_Design_Unit;
               Dep_File : Iir_Design_File;
            begin
               if Depends /= Null_Iir_List then
                  Depends_It := List_Iterate (Depends);
                  while Is_Valid (Depends_It) loop
                     El := Get_Element (Depends_It);
                     Dep := Libraries.Find_Design_Unit (El);
                     if Dep = Null_Iir then
                        if Flag_Verbose then
                           Disp_Library_Unit (Unit);
                           Put (" depends on an unknown unit ");
                           Disp_Library_Unit (El);
                           New_Line;
                        end if;
                        return True;
                     end if;
                     Dep_File := Get_Design_File (Dep);
                     if Dep /= Std_Package.Std_Standard_Unit
                       and then
                       Files_Map.Is_Gt (Get_Analysis_Time_Stamp (Dep_File),
                                        Stamp)
                     then
                        if Flag_Verbose then
                           Disp_Library_Unit (Get_Library_Unit (Unit));
                           Put (" depends on: ");
                           Disp_Library_Unit (Get_Library_Unit (Dep));
                           Put (" (more recently analyzed)");
                           New_Line;
                        end if;
                        return True;
                     end if;
                     Next (Depends_It);
                  end loop;
               end if;
            end;
         end if;
         Unit := Get_Chain (Unit);
      end loop;

      return False;
   end Is_File_Outdated;

   --  Convert NAME to lower cases, unless it is an extended identifier.
   function Convert_Name (Name : String_Access) return String_Access
   is
      function Is_Bad_Unit_Name return Boolean is
      begin
         if Name'Length = 0 then
            return True;
         end if;
         --  Don't try to handle extended identifier.
         if Name (Name'First) = '\' then
            return False;
         end if;
         --  Look for suspicious characters.
         --  Do not try to be exhaustive as the correct check will be done
         --  by convert_identifier.
         for I in Name'Range loop
            case Name (I) is
               when '.' | '/' | '\' =>
                  return True;
               when others =>
                  null;
            end case;
         end loop;
         return False;
      end Is_Bad_Unit_Name;

      function Is_A_File_Name return Boolean is
      begin
         --  Check .vhd
         if Name'Length > 4
           and then Name (Name'Last - 3 .. Name'Last) = ".vhd"
         then
            return True;
         end if;
         --  Check .vhdl
         if Name'Length > 5
           and then Name (Name'Last - 4 .. Name'Last) = ".vhdl"
         then
            return True;
         end if;
         --  Check ../
         if Name'Length > 3
           and then Name (Name'First .. Name'First + 2) = "../"
         then
            return True;
         end if;
         --  Check ..\
         if Name'Length > 3
           and then Name (Name'First .. Name'First + 2) = "..\"
         then
            return True;
         end if;
         --  Should try to find the file ?
         return False;
      end Is_A_File_Name;

      Res : String_Access;
   begin
      --  Try to identifier bad names (such as file names), so that
      --  friendly message can be displayed.
      if Is_Bad_Unit_Name then
         Errorout.Error_Msg_Option_NR ("bad unit name '" & Name.all & "'");
         if Is_A_File_Name then
            Errorout.Error_Msg_Option_NR
              ("(a unit name is required instead of a filename)");
         end if;
         raise Option_Error;
      end if;
      Res := new String'(Name.all);
      Scanner.Convert_Identifier (Res.all);
      return Res;
   end Convert_Name;

   procedure Extract_Elab_Unit
     (Cmd_Name : String; Args : Argument_List; Next_Arg : out Natural)
   is
   begin
      if Args'Length = 0 then
         Error ("command '" & Cmd_Name & "' required an unit name");
         raise Option_Error;
      end if;

      Prim_Name := Convert_Name (Args (Args'First));
      Next_Arg := Args'First + 1;
      Sec_Name := null;

      if Args'Length >= 2 then
         declare
            Sec : constant String_Access := Args (Next_Arg);
         begin
            if Sec (Sec'First) /= '-' then
               Sec_Name := Convert_Name (Sec);
               Next_Arg := Args'First + 2;
            end if;
         end;
      end if;
   end Extract_Elab_Unit;

   procedure Register_Commands is
   begin
      Register_Command (new Command_Import);
      Register_Command (new Command_Check_Syntax);
      Register_Command (new Command_Dir);
      Register_Command (new Command_Find);
      Register_Command (new Command_Clean);
      Register_Command (new Command_Remove);
      Register_Command (new Command_Copy);
      Register_Command (new Command_Disp_Standard);
      Register_Command (new Command_Find_Top);
      Register_Command (new Command_Bug_Box);
   end Register_Commands;
end Ghdllocal;