aboutsummaryrefslogtreecommitdiff
path: root/gcc/fortran/error.c
blob: dacc1d7ba5112fb640d1f37ab93fca2076c949aa (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
/* Handle errors.
   Copyright (C) 2000-2020 Free Software Foundation, Inc.
   Contributed by Andy Vaught & Niels Kristian Bech Jensen

This file is part of GCC.

GCC 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 3, or (at your option) any later
version.

GCC 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 COPYING3.  If not see
<http://www.gnu.org/licenses/>.  */

/* Handle the inevitable errors.  A major catch here is that things
   flagged as errors in one match subroutine can conceivably be legal
   elsewhere.  This means that error messages are recorded and saved
   for possible use later.  If a line does not match a legal
   construction, then the saved error message is reported.  */

#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "options.h"
#include "gfortran.h"

#include "diagnostic.h"
#include "diagnostic-color.h"
#include "tree-diagnostic.h" /* tree_diagnostics_defaults */

static int suppress_errors = 0;

static bool warnings_not_errors = false;

static int terminal_width;

/* True if the error/warnings should be buffered.  */
static bool buffered_p;

static gfc_error_buffer error_buffer;
/* These are always buffered buffers (.flush_p == false) to be used by
   the pretty-printer.  */
static output_buffer *pp_error_buffer, *pp_warning_buffer;
static int warningcount_buffered, werrorcount_buffered;

/* Return true if there output_buffer is empty.  */

static bool
gfc_output_buffer_empty_p (const output_buffer * buf)
{
  return output_buffer_last_position_in_text (buf) == NULL;
}

/* Go one level deeper suppressing errors.  */

void
gfc_push_suppress_errors (void)
{
  gcc_assert (suppress_errors >= 0);
  ++suppress_errors;
}

static void
gfc_error_opt (int opt, const char *gmsgid, va_list ap)  ATTRIBUTE_GCC_GFC(2,0);

static bool
gfc_warning (int opt, const char *gmsgid, va_list ap) ATTRIBUTE_GCC_GFC(2,0);


/* Leave one level of error suppressing.  */

void
gfc_pop_suppress_errors (void)
{
  gcc_assert (suppress_errors > 0);
  --suppress_errors;
}


/* Determine terminal width (for trimming source lines in output).  */

static int
gfc_get_terminal_width (void)
{
  return isatty (STDERR_FILENO) ? get_terminal_width () : INT_MAX;
}


/* Per-file error initialization.  */

void
gfc_error_init_1 (void)
{
  terminal_width = gfc_get_terminal_width ();
  gfc_buffer_error (false);
}


/* Set the flag for buffering errors or not.  */

void
gfc_buffer_error (bool flag)
{
  buffered_p = flag;
}


/* Add a single character to the error buffer or output depending on
   buffered_p.  */

static void
error_char (char)
{
  /* FIXME: Unused function to be removed in a subsequent patch.  */
}


/* Copy a string to wherever it needs to go.  */

static void
error_string (const char *p)
{
  while (*p)
    error_char (*p++);
}


/* Print a formatted integer to the error buffer or output.  */

#define IBUF_LEN 60

static void
error_uinteger (unsigned long int i)
{
  char *p, int_buf[IBUF_LEN];

  p = int_buf + IBUF_LEN - 1;
  *p-- = '\0';

  if (i == 0)
    *p-- = '0';

  while (i > 0)
    {
      *p-- = i % 10 + '0';
      i = i / 10;
    }

  error_string (p + 1);
}

static void
error_integer (long int i)
{
  unsigned long int u;

  if (i < 0)
    {
      u = (unsigned long int) -i;
      error_char ('-');
    }
  else
    u = i;

  error_uinteger (u);
}


static size_t
gfc_widechar_display_length (gfc_char_t c)
{
  if (gfc_wide_is_printable (c) || c == '\t')
    /* Printable ASCII character, or tabulation (output as a space).  */
    return 1;
  else if (c < ((gfc_char_t) 1 << 8))
    /* Displayed as \x??  */
    return 4;
  else if (c < ((gfc_char_t) 1 << 16))
    /* Displayed as \u????  */
    return 6;
  else
    /* Displayed as \U????????  */
    return 10;
}


/* Length of the ASCII representation of the wide string, escaping wide
   characters as print_wide_char_into_buffer() does.  */

static size_t
gfc_wide_display_length (const gfc_char_t *str)
{
  size_t i, len;

  for (i = 0, len = 0; str[i]; i++)
    len += gfc_widechar_display_length (str[i]);

  return len;
}

static int
print_wide_char_into_buffer (gfc_char_t c, char *buf)
{
  static const char xdigit[16] = { '0', '1', '2', '3', '4', '5', '6',
    '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };

  if (gfc_wide_is_printable (c) || c == '\t')
    {
      buf[1] = '\0';
      /* Tabulation is output as a space.  */
      buf[0] = (unsigned char) (c == '\t' ? ' ' : c);
      return 1;
    }
  else if (c < ((gfc_char_t) 1 << 8))
    {
      buf[4] = '\0';
      buf[3] = xdigit[c & 0x0F];
      c = c >> 4;
      buf[2] = xdigit[c & 0x0F];

      buf[1] = 'x';
      buf[0] = '\\';
      return 4;
    }
  else if (c < ((gfc_char_t) 1 << 16))
    {
      buf[6] = '\0';
      buf[5] = xdigit[c & 0x0F];
      c = c >> 4;
      buf[4] = xdigit[c & 0x0F];
      c = c >> 4;
      buf[3] = xdigit[c & 0x0F];
      c = c >> 4;
      buf[2] = xdigit[c & 0x0F];

      buf[1] = 'u';
      buf[0] = '\\';
      return 6;
    }
  else
    {
      buf[10] = '\0';
      buf[9] = xdigit[c & 0x0F];
      c = c >> 4;
      buf[8] = xdigit[c & 0x0F];
      c = c >> 4;
      buf[7] = xdigit[c & 0x0F];
      c = c >> 4;
      buf[6] = xdigit[c & 0x0F];
      c = c >> 4;
      buf[5] = xdigit[c & 0x0F];
      c = c >> 4;
      buf[4] = xdigit[c & 0x0F];
      c = c >> 4;
      buf[3] = xdigit[c & 0x0F];
      c = c >> 4;
      buf[2] = xdigit[c & 0x0F];

      buf[1] = 'U';
      buf[0] = '\\';
      return 10;
    }
}

static char wide_char_print_buffer[11];

const char *
gfc_print_wide_char (gfc_char_t c)
{
  print_wide_char_into_buffer (c, wide_char_print_buffer);
  return wide_char_print_buffer;
}


/* Show the file, where it was included, and the source line, give a
   locus.  Calls error_printf() recursively, but the recursion is at
   most one level deep.  */

static void error_printf (const char *, ...) ATTRIBUTE_GCC_GFC(1,2);

static void
show_locus (locus *loc, int c1, int c2)
{
  gfc_linebuf *lb;
  gfc_file *f;
  gfc_char_t *p;
  int i, offset, cmax;

  /* TODO: Either limit the total length and number of included files
     displayed or add buffering of arbitrary number of characters in
     error messages.  */

  /* Write out the error header line, giving the source file and error
     location (in GNU standard "[file]:[line].[column]:" format),
     followed by an "included by" stack and a blank line.  This header
     format is matched by a testsuite parser defined in
     lib/gfortran-dg.exp.  */

  lb = loc->lb;
  f = lb->file;

  error_string (f->filename);
  error_char (':');

  error_integer (LOCATION_LINE (lb->location));

  if ((c1 > 0) || (c2 > 0))
    error_char ('.');

  if (c1 > 0)
    error_integer (c1);

  if ((c1 > 0) && (c2 > 0))
    error_char ('-');

  if (c2 > 0)
    error_integer (c2);

  error_char (':');
  error_char ('\n');

  for (;;)
    {
      i = f->inclusion_line;

      f = f->up;
      if (f == NULL) break;

      error_printf ("    Included at %s:%d:", f->filename, i);
    }

  error_char ('\n');

  /* Calculate an appropriate horizontal offset of the source line in
     order to get the error locus within the visible portion of the
     line.  Note that if the margin of 5 here is changed, the
     corresponding margin of 10 in show_loci should be changed.  */

  offset = 0;

  /* If the two loci would appear in the same column, we shift
     '2' one column to the right, so as to print '12' rather than
     just '1'.  We do this here so it will be accounted for in the
     margin calculations.  */

  if (c1 == c2)
    c2 += 1;

  cmax = (c1 < c2) ? c2 : c1;
  if (cmax > terminal_width - 5)
    offset = cmax - terminal_width + 5;

  /* Show the line itself, taking care not to print more than what can
     show up on the terminal.  Tabs are converted to spaces, and
     nonprintable characters are converted to a "\xNN" sequence.  */

  p = &(lb->line[offset]);
  i = gfc_wide_display_length (p);
  if (i > terminal_width)
    i = terminal_width - 1;

  while (i > 0)
    {
      static char buffer[11];
      i -= print_wide_char_into_buffer (*p++, buffer);
      error_string (buffer);
    }

  error_char ('\n');

  /* Show the '1' and/or '2' corresponding to the column of the error
     locus.  Note that a value of -1 for c1 or c2 will simply cause
     the relevant number not to be printed.  */

  c1 -= offset;
  c2 -= offset;
  cmax -= offset;

  p = &(lb->line[offset]);
  for (i = 0; i < cmax; i++)
    {
      int spaces, j;
      spaces = gfc_widechar_display_length (*p++);

      if (i == c1)
	error_char ('1'), spaces--;
      else if (i == c2)
	error_char ('2'), spaces--;

      for (j = 0; j < spaces; j++)
	error_char (' ');
    }

  if (i == c1)
    error_char ('1');
  else if (i == c2)
    error_char ('2');

  error_char ('\n');

}


/* As part of printing an error, we show the source lines that caused
   the problem.  We show at least one, and possibly two loci; the two
   loci may or may not be on the same source line.  */

static void
show_loci (locus *l1, locus *l2)
{
  int m, c1, c2;

  if (l1 == NULL || l1->lb == NULL)
    {
      error_printf ("<During initialization>\n");
      return;
    }

  /* While calculating parameters for printing the loci, we consider possible
     reasons for printing one per line.  If appropriate, print the loci
     individually; otherwise we print them both on the same line.  */

  c1 = l1->nextc - l1->lb->line;
  if (l2 == NULL)
    {
      show_locus (l1, c1, -1);
      return;
    }

  c2 = l2->nextc - l2->lb->line;

  if (c1 < c2)
    m = c2 - c1;
  else
    m = c1 - c2;

  /* Note that the margin value of 10 here needs to be less than the
     margin of 5 used in the calculation of offset in show_locus.  */

  if (l1->lb != l2->lb || m > terminal_width - 10)
    {
      show_locus (l1, c1, -1);
      show_locus (l2, -1, c2);
      return;
    }

  show_locus (l1, c1, c2);

  return;
}


/* Workhorse for the error printing subroutines.  This subroutine is
   inspired by g77's error handling and is similar to printf() with
   the following %-codes:

   %c Character, %d or %i Integer, %s String, %% Percent
   %L  Takes locus argument
   %C  Current locus (no argument)

   If a locus pointer is given, the actual source line is printed out
   and the column is indicated.  Since we want the error message at
   the bottom of any source file information, we must scan the
   argument list twice -- once to determine whether the loci are
   present and record this for printing, and once to print the error
   message after and loci have been printed.  A maximum of two locus
   arguments are permitted.

   This function is also called (recursively) by show_locus in the
   case of included files; however, as show_locus does not resupply
   any loci, the recursion is at most one level deep.  */

#define MAX_ARGS 10

static void ATTRIBUTE_GCC_GFC(2,0)
error_print (const char *type, const char *format0, va_list argp)
{
  enum { TYPE_CURRENTLOC, TYPE_LOCUS, TYPE_INTEGER, TYPE_UINTEGER,
         TYPE_LONGINT, TYPE_ULONGINT, TYPE_CHAR, TYPE_STRING,
	 NOTYPE };
  struct
  {
    int type;
    int pos;
    union
    {
      int intval;
      unsigned int uintval;
      long int longintval;
      unsigned long int ulongintval;
      char charval;
      const char * stringval;
    } u;
  } arg[MAX_ARGS], spec[MAX_ARGS];
  /* spec is the array of specifiers, in the same order as they
     appear in the format string.  arg is the array of arguments,
     in the same order as they appear in the va_list.  */

  char c;
  int i, n, have_l1, pos, maxpos;
  locus *l1, *l2, *loc;
  const char *format;

  loc = l1 = l2 = NULL;

  have_l1 = 0;
  pos = -1;
  maxpos = -1;

  n = 0;
  format = format0;

  for (i = 0; i < MAX_ARGS; i++)
    {
      arg[i].type = NOTYPE;
      spec[i].pos = -1;
    }

  /* First parse the format string for position specifiers.  */
  while (*format)
    {
      c = *format++;
      if (c != '%')
	continue;

      if (*format == '%')
	{
	  format++;
	  continue;
	}

      if (ISDIGIT (*format))
	{
	  /* This is a position specifier.  For example, the number
	     12 in the format string "%12$d", which specifies the third
	     argument of the va_list, formatted in %d format.
	     For details, see "man 3 printf".  */
	  pos = atoi(format) - 1;
	  gcc_assert (pos >= 0);
	  while (ISDIGIT(*format))
	    format++;
	  gcc_assert (*format == '$');
	  format++;
	}
      else
	pos++;

      c = *format++;

      if (pos > maxpos)
	maxpos = pos;

      switch (c)
	{
	  case 'C':
	    arg[pos].type = TYPE_CURRENTLOC;
	    break;

	  case 'L':
	    arg[pos].type = TYPE_LOCUS;
	    break;

	  case 'd':
	  case 'i':
	    arg[pos].type = TYPE_INTEGER;
	    break;

	  case 'u':
	    arg[pos].type = TYPE_UINTEGER;
	    break;

	  case 'l':
	    c = *format++;
	    if (c == 'u')
	      arg[pos].type = TYPE_ULONGINT;
	    else if (c == 'i' || c == 'd')
	      arg[pos].type = TYPE_LONGINT;
	    else
	      gcc_unreachable ();
	    break;

	  case 'c':
	    arg[pos].type = TYPE_CHAR;
	    break;

	  case 's':
	    arg[pos].type = TYPE_STRING;
	    break;

	  default:
	    gcc_unreachable ();
	}

      spec[n++].pos = pos;
    }

  /* Then convert the values for each %-style argument.  */
  for (pos = 0; pos <= maxpos; pos++)
    {
      gcc_assert (arg[pos].type != NOTYPE);
      switch (arg[pos].type)
	{
	  case TYPE_CURRENTLOC:
	    loc = &gfc_current_locus;
	    /* Fall through.  */

	  case TYPE_LOCUS:
	    if (arg[pos].type == TYPE_LOCUS)
	      loc = va_arg (argp, locus *);

	    if (have_l1)
	      {
		l2 = loc;
		arg[pos].u.stringval = "(2)";
		/* Point %C first offending character not the last good one. */
		if (arg[pos].type == TYPE_CURRENTLOC && *l2->nextc != '\0')
		  l2->nextc++;
	      }
	    else
	      {
		l1 = loc;
		have_l1 = 1;
		arg[pos].u.stringval = "(1)";
		/* Point %C first offending character not the last good one. */
		if (arg[pos].type == TYPE_CURRENTLOC && *l1->nextc != '\0')
		  l1->nextc++;
	      }
	    break;

	  case TYPE_INTEGER:
	    arg[pos].u.intval = va_arg (argp, int);
	    break;

	  case TYPE_UINTEGER:
	    arg[pos].u.uintval = va_arg (argp, unsigned int);
	    break;

	  case TYPE_LONGINT:
	    arg[pos].u.longintval = va_arg (argp, long int);
	    break;

	  case TYPE_ULONGINT:
	    arg[pos].u.ulongintval = va_arg (argp, unsigned long int);
	    break;

	  case TYPE_CHAR:
	    arg[pos].u.charval = (char) va_arg (argp, int);
	    break;

	  case TYPE_STRING:
	    arg[pos].u.stringval = (const char *) va_arg (argp, char *);
	    break;

	  default:
	    gcc_unreachable ();
	}
    }

  for (n = 0; spec[n].pos >= 0; n++)
    spec[n].u = arg[spec[n].pos].u;

  /* Show the current loci if we have to.  */
  if (have_l1)
    show_loci (l1, l2);

  if (*type)
    {
      error_string (type);
      error_char (' ');
    }

  have_l1 = 0;
  format = format0;
  n = 0;

  for (; *format; format++)
    {
      if (*format != '%')
	{
	  error_char (*format);
	  continue;
	}

      format++;
      if (ISDIGIT (*format))
	{
	  /* This is a position specifier.  See comment above.  */
	  while (ISDIGIT (*format))
	    format++;

	  /* Skip over the dollar sign.  */
	  format++;
	}

      switch (*format)
	{
	case '%':
	  error_char ('%');
	  break;

	case 'c':
	  error_char (spec[n++].u.charval);
	  break;

	case 's':
	case 'C':		/* Current locus */
	case 'L':		/* Specified locus */
	  error_string (spec[n++].u.stringval);
	  break;

	case 'd':
	case 'i':
	  error_integer (spec[n++].u.intval);
	  break;

	case 'u':
	  error_uinteger (spec[n++].u.uintval);
	  break;

	case 'l':
	  format++;
	  if (*format == 'u')
	    error_uinteger (spec[n++].u.ulongintval);
	  else
	    error_integer (spec[n++].u.longintval);
	  break;

	}
    }

  error_char ('\n');
}


/* Wrapper for error_print().  */

static void
error_printf (const char *gmsgid, ...)
{
  va_list argp;

  va_start (argp, gmsgid);
  error_print ("", _(gmsgid), argp);
  va_end (argp);
}


/* Clear any output buffered in a pretty-print output_buffer.  */

static void
gfc_clear_pp_buffer (output_buffer *this_buffer)
{
  pretty_printer *pp = global_dc->printer;
  output_buffer *tmp_buffer = pp->buffer;
  pp->buffer = this_buffer;
  pp_clear_output_area (pp);
  pp->buffer = tmp_buffer;
  /* We need to reset last_location, otherwise we may skip caret lines
     when we actually give a diagnostic.  */
  global_dc->last_location = UNKNOWN_LOCATION;
}

/* The currently-printing diagnostic, for use by gfc_format_decoder,
   for colorizing %C and %L.  */

static diagnostic_info *curr_diagnostic;

/* A helper function to call diagnostic_report_diagnostic, while setting
   curr_diagnostic for the duration of the call.  */

static bool
gfc_report_diagnostic (diagnostic_info *diagnostic)
{
  gcc_assert (diagnostic != NULL);
  curr_diagnostic = diagnostic;
  bool ret = diagnostic_report_diagnostic (global_dc, diagnostic);
  curr_diagnostic = NULL;
  return ret;
}

/* This is just a helper function to avoid duplicating the logic of
   gfc_warning.  */

static bool
gfc_warning (int opt, const char *gmsgid, va_list ap)
{
  va_list argp;
  va_copy (argp, ap);

  diagnostic_info diagnostic;
  rich_location rich_loc (line_table, UNKNOWN_LOCATION);
  bool fatal_errors = global_dc->fatal_errors;
  pretty_printer *pp = global_dc->printer;
  output_buffer *tmp_buffer = pp->buffer;

  gfc_clear_pp_buffer (pp_warning_buffer);

  if (buffered_p)
    {
      pp->buffer = pp_warning_buffer;
      global_dc->fatal_errors = false;
      /* To prevent -fmax-errors= triggering.  */
      --werrorcount;
    }

  diagnostic_set_info (&diagnostic, gmsgid, &argp, &rich_loc,
		       DK_WARNING);
  diagnostic.option_index = opt;
  bool ret = gfc_report_diagnostic (&diagnostic);

  if (buffered_p)
    {
      pp->buffer = tmp_buffer;
      global_dc->fatal_errors = fatal_errors;

      warningcount_buffered = 0;
      werrorcount_buffered = 0;
      /* Undo the above --werrorcount if not Werror, otherwise
	 werrorcount is correct already.  */
      if (!ret)
	++werrorcount;
      else if (diagnostic.kind == DK_ERROR)
	++werrorcount_buffered;
      else
	++werrorcount, --warningcount, ++warningcount_buffered;
    }

  va_end (argp);
  return ret;
}

/* Issue a warning.  */

bool
gfc_warning (int opt, const char *gmsgid, ...)
{
  va_list argp;

  va_start (argp, gmsgid);
  bool ret = gfc_warning (opt, gmsgid, argp);
  va_end (argp);
  return ret;
}


/* Whether, for a feature included in a given standard set (GFC_STD_*),
   we should issue an error or a warning, or be quiet.  */

notification
gfc_notification_std (int std)
{
  bool warning;

  warning = ((gfc_option.warn_std & std) != 0) && !inhibit_warnings;
  if ((gfc_option.allow_std & std) != 0 && !warning)
    return SILENT;

  return warning ? WARNING : ERROR;
}


/* Return a string describing the nature of a standard violation
 * and/or the relevant version of the standard.  */

char const*
notify_std_msg(int std)
{

  if (std & GFC_STD_F2018_DEL)
    return _("Fortran 2018 deleted feature:");
  else if (std & GFC_STD_F2018_OBS)
    return _("Fortran 2018 obsolescent feature:");
  else if (std & GFC_STD_F2018)
    return _("Fortran 2018:");
  else if (std & GFC_STD_F2008_OBS)
    return _("Fortran 2008 obsolescent feature:");
  else if (std & GFC_STD_F2008)
    return "Fortran 2008:";
  else if (std & GFC_STD_F2003)
    return "Fortran 2003:";
  else if (std & GFC_STD_GNU)
    return _("GNU Extension:");
  else if (std & GFC_STD_LEGACY)
    return _("Legacy Extension:");
  else if (std & GFC_STD_F95_OBS)
    return _("Obsolescent feature:");
  else if (std & GFC_STD_F95_DEL)
    return _("Deleted feature:");
  else
    gcc_unreachable ();
}


/* Possibly issue a warning/error about use of a nonstandard (or deleted)
   feature.  An error/warning will be issued if the currently selected
   standard does not contain the requested bits.  Return false if
   an error is generated.  */

bool
gfc_notify_std (int std, const char *gmsgid, ...)
{
  va_list argp;
  const char *msg, *msg2;
  char *buffer;

  /* Determine whether an error or a warning is needed.  */
  const int wstd = std & gfc_option.warn_std;    /* Standard to warn about.  */
  const int estd = std & ~gfc_option.allow_std;  /* Standard to error about.  */
  const bool warning = (wstd != 0) && !inhibit_warnings;
  const bool error = (estd != 0);

  if (!error && !warning)
    return true;
  if (suppress_errors)
    return !error;

  if (error)
    msg = notify_std_msg (estd);
  else
    msg = notify_std_msg (wstd);

  msg2 = _(gmsgid);
  buffer = (char *) alloca (strlen (msg) + strlen (msg2) + 2);
  strcpy (buffer, msg);
  strcat (buffer, " ");
  strcat (buffer, msg2);

  va_start (argp, gmsgid);
  if (error)
    gfc_error_opt (0, buffer, argp);
  else
    gfc_warning (0, buffer, argp);
  va_end (argp);

  if (error)
    return false;
  else
    return (warning && !warnings_are_errors);
}


/* Called from output_format -- during diagnostic message processing
   to handle Fortran specific format specifiers with the following meanings:

   %C  Current locus (no argument)
   %L  Takes locus argument
*/
static bool
gfc_format_decoder (pretty_printer *pp, text_info *text, const char *spec,
		    int precision, bool wide, bool set_locus, bool hash,
		    bool *quoted, const char **buffer_ptr)
{
  switch (*spec)
    {
    case 'C':
    case 'L':
      {
	static const char *result[2] = { "(1)", "(2)" };
	locus *loc;
	if (*spec == 'C')
	  loc = &gfc_current_locus;
	else
	  loc = va_arg (*text->args_ptr, locus *);
	gcc_assert (loc->nextc - loc->lb->line >= 0);
	unsigned int offset = loc->nextc - loc->lb->line;
	if (*spec == 'C' && *loc->nextc != '\0')
	  /* Point %C first offending character not the last good one. */
	  offset++;
	/* If location[0] != UNKNOWN_LOCATION means that we already
	   processed one of %C/%L.  */
	int loc_num = text->get_location (0) == UNKNOWN_LOCATION ? 0 : 1;
	location_t src_loc
	  = linemap_position_for_loc_and_offset (line_table,
						 loc->lb->location,
						 offset);
	text->set_location (loc_num, src_loc, SHOW_RANGE_WITH_CARET);
	/* Colorize the markers to match the color choices of
	   diagnostic_show_locus (the initial location has a color given
	   by the "kind" of the diagnostic, the secondary location has
	   color "range1").  */
	gcc_assert (curr_diagnostic != NULL);
	const char *color
	  = (loc_num
	     ? "range1"
	     : diagnostic_get_color_for_kind (curr_diagnostic->kind));
	pp_string (pp, colorize_start (pp_show_color (pp), color));
	pp_string (pp, result[loc_num]);
	pp_string (pp, colorize_stop (pp_show_color (pp)));
	return true;
      }
    default:
      /* Fall through info the middle-end decoder, as e.g. stor-layout.c
	 etc. diagnostics can use the FE printer while the FE is still
	 active.  */
      return default_tree_printer (pp, text, spec, precision, wide,
				   set_locus, hash, quoted, buffer_ptr);
    }
}

/* Return a malloc'd string describing the kind of diagnostic.  The
   caller is responsible for freeing the memory.  */
static char *
gfc_diagnostic_build_kind_prefix (diagnostic_context *context,
				  const diagnostic_info *diagnostic)
{
  static const char *const diagnostic_kind_text[] = {
#define DEFINE_DIAGNOSTIC_KIND(K, T, C) (T),
#include "gfc-diagnostic.def"
#undef DEFINE_DIAGNOSTIC_KIND
    "must-not-happen"
  };
  static const char *const diagnostic_kind_color[] = {
#define DEFINE_DIAGNOSTIC_KIND(K, T, C) (C),
#include "gfc-diagnostic.def"
#undef DEFINE_DIAGNOSTIC_KIND
    NULL
  };
  gcc_assert (diagnostic->kind < DK_LAST_DIAGNOSTIC_KIND);
  const char *text = _(diagnostic_kind_text[diagnostic->kind]);
  const char *text_cs = "", *text_ce = "";
  pretty_printer *pp = context->printer;

  if (diagnostic_kind_color[diagnostic->kind])
    {
      text_cs = colorize_start (pp_show_color (pp),
				diagnostic_kind_color[diagnostic->kind]);
      text_ce = colorize_stop (pp_show_color (pp));
    }
  return build_message_string ("%s%s:%s ", text_cs, text, text_ce);
}

/* Return a malloc'd string describing a location.  The caller is
   responsible for freeing the memory.  */
static char *
gfc_diagnostic_build_locus_prefix (diagnostic_context *context,
				   expanded_location s)
{
  pretty_printer *pp = context->printer;
  const char *locus_cs = colorize_start (pp_show_color (pp), "locus");
  const char *locus_ce = colorize_stop (pp_show_color (pp));
  return (s.file == NULL
	  ? build_message_string ("%s%s:%s", locus_cs, progname, locus_ce )
	  : !strcmp (s.file, N_("<built-in>"))
	  ? build_message_string ("%s%s:%s", locus_cs, s.file, locus_ce)
	  : context->show_column
	  ? build_message_string ("%s%s:%d:%d:%s", locus_cs, s.file, s.line,
				  s.column, locus_ce)
	  : build_message_string ("%s%s:%d:%s", locus_cs, s.file, s.line, locus_ce));
}

/* Return a malloc'd string describing two locations.  The caller is
   responsible for freeing the memory.  */
static char *
gfc_diagnostic_build_locus_prefix (diagnostic_context *context,
				   expanded_location s, expanded_location s2)
{
  pretty_printer *pp = context->printer;
  const char *locus_cs = colorize_start (pp_show_color (pp), "locus");
  const char *locus_ce = colorize_stop (pp_show_color (pp));

  return (s.file == NULL
	  ? build_message_string ("%s%s:%s", locus_cs, progname, locus_ce )
	  : !strcmp (s.file, N_("<built-in>"))
	  ? build_message_string ("%s%s:%s", locus_cs, s.file, locus_ce)
	  : context->show_column
	  ? build_message_string ("%s%s:%d:%d-%d:%s", locus_cs, s.file, s.line,
				  MIN (s.column, s2.column),
				  MAX (s.column, s2.column), locus_ce)
	  : build_message_string ("%s%s:%d:%s", locus_cs, s.file, s.line,
				  locus_ce));
}

/* This function prints the locus (file:line:column), the diagnostic kind
   (Error, Warning) and (optionally) the relevant lines of code with
   annotation lines with '1' and/or '2' below them.

   With -fdiagnostic-show-caret (the default) it prints:

       [locus of primary range]:

          some code
                 1
       Error: Some error at (1)

  With -fno-diagnostic-show-caret or if the primary range is not
  valid, it prints:

       [locus of primary range]: Error: Some error at (1) and (2)
*/
static void
gfc_diagnostic_starter (diagnostic_context *context,
			diagnostic_info *diagnostic)
{
  char * kind_prefix = gfc_diagnostic_build_kind_prefix (context, diagnostic);

  expanded_location s1 = diagnostic_expand_location (diagnostic);
  expanded_location s2;
  bool one_locus = diagnostic->richloc->get_num_locations () < 2;
  bool same_locus = false;

  if (!one_locus)
    {
      s2 = diagnostic_expand_location (diagnostic, 1);
      same_locus = diagnostic_same_line (context, s1, s2);
    }

  char * locus_prefix = (one_locus || !same_locus)
    ? gfc_diagnostic_build_locus_prefix (context, s1)
    : gfc_diagnostic_build_locus_prefix (context, s1, s2);

  if (!context->show_caret
      || diagnostic_location (diagnostic, 0) <= BUILTINS_LOCATION
      || diagnostic_location (diagnostic, 0) == context->last_location)
    {
      pp_set_prefix (context->printer,
		     concat (locus_prefix, " ", kind_prefix, NULL));
      free (locus_prefix);

      if (one_locus || same_locus)
	{
	  free (kind_prefix);
	  return;
	}
      /* In this case, we print the previous locus and prefix as:

	  [locus]:[prefix]: (1)

	 and we flush with a new line before setting the new prefix.  */
      pp_string (context->printer, "(1)");
      pp_newline (context->printer);
      locus_prefix = gfc_diagnostic_build_locus_prefix (context, s2);
      pp_set_prefix (context->printer,
		     concat (locus_prefix, " ", kind_prefix, NULL));
      free (kind_prefix);
      free (locus_prefix);
    }
  else
    {
      pp_verbatim (context->printer, "%s", locus_prefix);
      free (locus_prefix);
      /* Fortran uses an empty line between locus and caret line.  */
      pp_newline (context->printer);
      pp_set_prefix (context->printer, NULL);
      pp_newline (context->printer);
      diagnostic_show_locus (context, diagnostic->richloc, diagnostic->kind);
      /* If the caret line was shown, the prefix does not contain the
	 locus.  */
      pp_set_prefix (context->printer, kind_prefix);
    }
}

static void
gfc_diagnostic_start_span (diagnostic_context *context,
			   expanded_location exploc)
{
  char *locus_prefix;
  locus_prefix = gfc_diagnostic_build_locus_prefix (context, exploc);
  pp_verbatim (context->printer, "%s", locus_prefix);
  free (locus_prefix);
  pp_newline (context->printer);
  /* Fortran uses an empty line between locus and caret line.  */
  pp_newline (context->printer);
}


static void
gfc_diagnostic_finalizer (diagnostic_context *context,
			  diagnostic_info *diagnostic ATTRIBUTE_UNUSED,
			  diagnostic_t orig_diag_kind ATTRIBUTE_UNUSED)
{
  pp_destroy_prefix (context->printer);
  pp_newline_and_flush (context->printer);
}

/* Immediate warning (i.e. do not buffer the warning) with an explicit
   location.  */

bool
gfc_warning_now_at (location_t loc, int opt, const char *gmsgid, ...)
{
  va_list argp;
  diagnostic_info diagnostic;
  rich_location rich_loc (line_table, loc);
  bool ret;

  va_start (argp, gmsgid);
  diagnostic_set_info (&diagnostic, gmsgid, &argp, &rich_loc, DK_WARNING);
  diagnostic.option_index = opt;
  ret = gfc_report_diagnostic (&diagnostic);
  va_end (argp);
  return ret;
}

/* Immediate warning (i.e. do not buffer the warning).  */

bool
gfc_warning_now (int opt, const char *gmsgid, ...)
{
  va_list argp;
  diagnostic_info diagnostic;
  rich_location rich_loc (line_table, UNKNOWN_LOCATION);
  bool ret;

  va_start (argp, gmsgid);
  diagnostic_set_info (&diagnostic, gmsgid, &argp, &rich_loc,
		       DK_WARNING);
  diagnostic.option_index = opt;
  ret = gfc_report_diagnostic (&diagnostic);
  va_end (argp);
  return ret;
}

/* Internal warning, do not buffer.  */

bool
gfc_warning_internal (int opt, const char *gmsgid, ...)
{
  va_list argp;
  diagnostic_info diagnostic;
  rich_location rich_loc (line_table, UNKNOWN_LOCATION);
  bool ret;

  va_start (argp, gmsgid);
  diagnostic_set_info (&diagnostic, gmsgid, &argp, &rich_loc,
		       DK_WARNING);
  diagnostic.option_index = opt;
  ret = gfc_report_diagnostic (&diagnostic);
  va_end (argp);
  return ret;
}

/* Immediate error (i.e. do not buffer).  */

void
gfc_error_now (const char *gmsgid, ...)
{
  va_list argp;
  diagnostic_info diagnostic;
  rich_location rich_loc (line_table, UNKNOWN_LOCATION);

  error_buffer.flag = true;

  va_start (argp, gmsgid);
  diagnostic_set_info (&diagnostic, gmsgid, &argp, &rich_loc, DK_ERROR);
  gfc_report_diagnostic (&diagnostic);
  va_end (argp);
}


/* Fatal error, never returns.  */

void
gfc_fatal_error (const char *gmsgid, ...)
{
  va_list argp;
  diagnostic_info diagnostic;
  rich_location rich_loc (line_table, UNKNOWN_LOCATION);

  va_start (argp, gmsgid);
  diagnostic_set_info (&diagnostic, gmsgid, &argp, &rich_loc, DK_FATAL);
  gfc_report_diagnostic (&diagnostic);
  va_end (argp);

  gcc_unreachable ();
}

/* Clear the warning flag.  */

void
gfc_clear_warning (void)
{
  gfc_clear_pp_buffer (pp_warning_buffer);
  warningcount_buffered = 0;
  werrorcount_buffered = 0;
}


/* Check to see if any warnings have been saved.
   If so, print the warning.  */

void
gfc_warning_check (void)
{
  if (! gfc_output_buffer_empty_p (pp_warning_buffer))
    {
      pretty_printer *pp = global_dc->printer;
      output_buffer *tmp_buffer = pp->buffer;
      pp->buffer = pp_warning_buffer;
      pp_really_flush (pp);
      warningcount += warningcount_buffered;
      werrorcount += werrorcount_buffered;
      gcc_assert (warningcount_buffered + werrorcount_buffered == 1);
      pp->buffer = tmp_buffer;
      diagnostic_action_after_output (global_dc,
				      warningcount_buffered
				      ? DK_WARNING : DK_ERROR);
      diagnostic_check_max_errors (global_dc, true);
    }
}


/* Issue an error.  */

static void
gfc_error_opt (int opt, const char *gmsgid, va_list ap)
{
  va_list argp;
  va_copy (argp, ap);
  bool saved_abort_on_error = false;

  if (warnings_not_errors)
    {
      gfc_warning (opt, gmsgid, argp);
      va_end (argp);
      return;
    }

  if (suppress_errors)
    {
      va_end (argp);
      return;
    }

  diagnostic_info diagnostic;
  rich_location richloc (line_table, UNKNOWN_LOCATION);
  bool fatal_errors = global_dc->fatal_errors;
  pretty_printer *pp = global_dc->printer;
  output_buffer *tmp_buffer = pp->buffer;

  gfc_clear_pp_buffer (pp_error_buffer);

  if (buffered_p)
    {
      /* To prevent -dH from triggering an abort on a buffered error,
	 save abort_on_error and restore it below.  */
      saved_abort_on_error = global_dc->abort_on_error;
      global_dc->abort_on_error = false;
      pp->buffer = pp_error_buffer;
      global_dc->fatal_errors = false;
      /* To prevent -fmax-errors= triggering, we decrease it before
	 report_diagnostic increases it.  */
      --errorcount;
    }

  diagnostic_set_info (&diagnostic, gmsgid, &argp, &richloc, DK_ERROR);
  gfc_report_diagnostic (&diagnostic);

  if (buffered_p)
    {
      pp->buffer = tmp_buffer;
      global_dc->fatal_errors = fatal_errors;
      global_dc->abort_on_error = saved_abort_on_error;

    }

  va_end (argp);
}


void
gfc_error_opt (int opt, const char *gmsgid, ...)
{
  va_list argp;
  va_start (argp, gmsgid);
  gfc_error_opt (opt, gmsgid, argp);
  va_end (argp);
}


void
gfc_error (const char *gmsgid, ...)
{
  va_list argp;
  va_start (argp, gmsgid);
  gfc_error_opt (0, gmsgid, argp);
  va_end (argp);
}


/* This shouldn't happen... but sometimes does.  */

void
gfc_internal_error (const char *gmsgid, ...)
{
  int e, w;
  va_list argp;
  diagnostic_info diagnostic;
  rich_location rich_loc (line_table, UNKNOWN_LOCATION);

  gfc_get_errors (&w, &e);
  if (e > 0)
    exit(EXIT_FAILURE);

  va_start (argp, gmsgid);
  diagnostic_set_info (&diagnostic, gmsgid, &argp, &rich_loc, DK_ICE);
  gfc_report_diagnostic (&diagnostic);
  va_end (argp);

  gcc_unreachable ();
}


/* Clear the error flag when we start to compile a source line.  */

void
gfc_clear_error (void)
{
  error_buffer.flag = false;
  warnings_not_errors = false;
  gfc_clear_pp_buffer (pp_error_buffer);
}


/* Tests the state of error_flag.  */

bool
gfc_error_flag_test (void)
{
  return error_buffer.flag
    || !gfc_output_buffer_empty_p (pp_error_buffer);
}


/* Check to see if any errors have been saved.
   If so, print the error.  Returns the state of error_flag.  */

bool
gfc_error_check (void)
{
  if (error_buffer.flag
      || ! gfc_output_buffer_empty_p (pp_error_buffer))
    {
      error_buffer.flag = false;
      pretty_printer *pp = global_dc->printer;
      output_buffer *tmp_buffer = pp->buffer;
      pp->buffer = pp_error_buffer;
      pp_really_flush (pp);
      ++errorcount;
      gcc_assert (gfc_output_buffer_empty_p (pp_error_buffer));
      pp->buffer = tmp_buffer;
      diagnostic_action_after_output (global_dc, DK_ERROR);
      diagnostic_check_max_errors (global_dc, true);
      return true;
    }

  return false;
}

/* Move the text buffered from FROM to TO, then clear
   FROM. Independently if there was text in FROM, TO is also
   cleared. */

static void
gfc_move_error_buffer_from_to (gfc_error_buffer * buffer_from,
			       gfc_error_buffer * buffer_to)
{
  output_buffer * from = &(buffer_from->buffer);
  output_buffer * to =  &(buffer_to->buffer);

  buffer_to->flag = buffer_from->flag;
  buffer_from->flag = false;

  gfc_clear_pp_buffer (to);
  /* We make sure this is always buffered.  */
  to->flush_p = false;

  if (! gfc_output_buffer_empty_p (from))
    {
      const char *str = output_buffer_formatted_text (from);
      output_buffer_append_r (to, str, strlen (str));
      gfc_clear_pp_buffer (from);
    }
}

/* Save the existing error state.  */

void
gfc_push_error (gfc_error_buffer *err)
{
  gfc_move_error_buffer_from_to (&error_buffer, err);
}


/* Restore a previous pushed error state.  */

void
gfc_pop_error (gfc_error_buffer *err)
{
  gfc_move_error_buffer_from_to (err, &error_buffer);
}


/* Free a pushed error state, but keep the current error state.  */

void
gfc_free_error (gfc_error_buffer *err)
{
  gfc_clear_pp_buffer (&(err->buffer));
}


/* Report the number of warnings and errors that occurred to the caller.  */

void
gfc_get_errors (int *w, int *e)
{
  if (w != NULL)
    *w = warningcount + werrorcount;
  if (e != NULL)
    *e = errorcount + sorrycount + werrorcount;
}


/* Switch errors into warnings.  */

void
gfc_errors_to_warnings (bool f)
{
  warnings_not_errors = f;
}

void
gfc_diagnostics_init (void)
{
  diagnostic_starter (global_dc) = gfc_diagnostic_starter;
  global_dc->start_span = gfc_diagnostic_start_span;
  diagnostic_finalizer (global_dc) = gfc_diagnostic_finalizer;
  diagnostic_format_decoder (global_dc) = gfc_format_decoder;
  global_dc->caret_chars[0] = '1';
  global_dc->caret_chars[1] = '2';
  pp_warning_buffer = new (XNEW (output_buffer)) output_buffer ();
  pp_warning_buffer->flush_p = false;
  /* pp_error_buffer is statically allocated.  This simplifies memory
     management when using gfc_push/pop_error. */
  pp_error_buffer = &(error_buffer.buffer);
  pp_error_buffer->flush_p = false;
}

void
gfc_diagnostics_finish (void)
{
  tree_diagnostics_defaults (global_dc);
  /* We still want to use the gfc starter and finalizer, not the tree
     defaults.  */
  diagnostic_starter (global_dc) = gfc_diagnostic_starter;
  diagnostic_finalizer (global_dc) = gfc_diagnostic_finalizer;
  global_dc->caret_chars[0] = '^';
  global_dc->caret_chars[1] = '^';
}