summaryrefslogtreecommitdiff
path: root/gcc/fortran/error.c
blob: be3d991f55d340b7633da532412634bf8eef1f44 (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
/* Handle errors.
   Copyright (C) 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
   Contributed by Andy Vaught & Niels Kristian Bech Jensen

This file is part of GNU G95.

GNU G95 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.

GNU G95 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 GNU G95; see the file COPYING.  If not, write to
the Free Software Foundation, 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */

/* 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 <string.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>

#include "flags.h"
#include "gfortran.h"

int gfc_suppress_error = 0;

static int terminal_width, buffer_flag, errors,
  use_warning_buffer, warnings;

static char *error_ptr, *warning_ptr;

static gfc_error_buf error_buffer, warning_buffer;


/* Per-file error initialization.  */

void
gfc_error_init_1 (void)
{

  terminal_width = gfc_terminal_width();
  errors = 0;
  warnings = 0;
  buffer_flag = 0;
}


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

void
gfc_buffer_error (int flag)
{

  buffer_flag = flag;
}


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

static void
error_char (char c)
{

  if (buffer_flag)
    {
      if (use_warning_buffer)
	{
	  *warning_ptr++ = c;
	  if (warning_ptr - warning_buffer.message >= MAX_ERROR_MESSAGE)
	    gfc_internal_error ("error_char(): Warning buffer overflow");
	}
      else
	{
	  *error_ptr++ = c;
	  if (error_ptr - error_buffer.message >= MAX_ERROR_MESSAGE)
	    gfc_internal_error ("error_char(): Error buffer overflow");
	}
    }
  else
    {
      if (c != 0)
	fputc (c, stderr);
    }
}


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

static void
error_string (const char *p)
{

  while (*p)
    error_char (*p++);
}


/* 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_PRINTF_1;

static void
show_locus (int offset, locus * l)
{
  gfc_file *f;
  char c, *p;
  int i, m;

  /* TODO: Either limit the total length and number of included files
     displayed or add buffering of arbitrary number of characters in
     error messages.  */
  f = l->file;
  error_printf ("In file %s:%d\n", f->filename, l->lp->start_line + l->line);

  f = f->included_by;
  while (f != NULL)
    {
      error_printf ("    Included at %s:%d\n", f->filename,
		    f->loc.lp->start_line + f->loc.line);
      f = f->included_by;
    }

  /* Show the line itself, taking care not to print more than what can
     show up on the terminal.  Tabs are converted to spaces.  */
  p = l->lp->line[l->line] + offset;
  i = strlen (p);
  if (i > terminal_width)
    i = terminal_width - 1;

  for (; i > 0; i--)
    {
      c = *p++;
      if (c == '\t')
	c = ' ';

      if (ISPRINT (c))
	error_char (c);
      else
	{
	  error_char ('\\');
	  error_char ('x');

	  m = ((c >> 4) & 0x0F) + '0';
	  if (m > '9')
	    m += 'A' - '9' - 1;
	  error_char (m);

	  m = (c & 0x0F) + '0';
	  if (m > '9')
	    m += 'A' - '9' - 1;
	  error_char (m);
	}
    }

  error_char ('\n');
}


/* As part of printing an error, we show the source lines that caused
   the problem.  We show at least one, possibly two loci.  If we're
   showing two loci and they both refer to the same file and line, we
   only print the line once.  */

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

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

  c1 = l1->nextc - l1->lp->line[l1->line];
  c2 = 0;
  if (l2 == NULL)
    goto separate;

  c2 = l2->nextc - l2->lp->line[l2->line];

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


  if (l1->lp != l2->lp || l1->line != l2->line || m > terminal_width - 10)
    goto separate;

  offset = 0;
  cmax = (c1 < c2) ? c2 : c1;
  if (cmax > terminal_width - 5)
    offset = cmax - terminal_width + 5;

  if (offset < 0)
    offset = 0;

  c1 -= offset;
  c2 -= offset;

  show_locus (offset, l1);

  /* Arrange that '1' and '2' will show up even if the two columns are equal.  */
  for (i = 1; i <= cmax; i++)
    {
      flag = 0;
      if (i == c1)
	{
	  error_char ('1');
	  flag = 1;
	}
      if (i == c2)
	{
	  error_char ('2');
	  flag = 1;
	}
      if (flag == 0)
	error_char (' ');
    }

  error_char ('\n');

  return;

separate:
  offset = 0;

  if (c1 > terminal_width - 5)
    {
      offset = c1 - 5;
      if (offset < 0)
	offset = 0;
      c1 = c1 - offset;
    }

  show_locus (offset, l1);
  for (i = 1; i < c1; i++)
    error_char (' ');

  error_char ('1');
  error_char ('\n');

  if (l2 != NULL)
    {
      offset = 0;

      if (c2 > terminal_width - 20)
	{
	  offset = c2 - 20;
	  if (offset < 0)
	    offset = 0;
	  c2 = c2 - offset;
	}

      show_locus (offset, l2);

      for (i = 1; i < c2; i++)
	error_char (' ');

      error_char ('2');
      error_char ('\n');
    }
}


/* 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 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.  A maximum of two locus arguments are
   permitted.  */

#define IBUF_LEN 30
#define MAX_ARGS 10

static void
error_print (const char *type, const char *format0, va_list argp)
{
  char c, *p, int_buf[IBUF_LEN], c_arg[MAX_ARGS], *cp_arg[MAX_ARGS];
  int i, n, have_l1, i_arg[MAX_ARGS];
  locus *l1, *l2, *loc;
  const char *format;

  l1 = l2 = loc = NULL;

  have_l1 = 0;

  n = 0;
  format = format0;

  while (*format)
    {
      c = *format++;
      if (c == '%')
	{
	  c = *format++;

	  switch (c)
	    {
	    case '%':
	      break;

	    case 'L':
	      loc = va_arg (argp, locus *);
	      /* Fall through */

	    case 'C':
	      if (c == 'C')
		loc = gfc_current_locus ();

	      if (have_l1)
		{
		  l2 = loc;
		}
	      else
		{
		  l1 = loc;
		  have_l1 = 1;
		}
	      break;

	    case 'd':
	    case 'i':
	      i_arg[n++] = va_arg (argp, int);
	      break;

	    case 'c':
	      c_arg[n++] = va_arg (argp, int);
	      break;

	    case 's':
	      cp_arg[n++] = va_arg (argp, char *);
	      break;
	    }
	}
    }

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

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

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

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

	case 'c':
	  error_char (c_arg[n++]);
	  break;

	case 's':
	  error_string (cp_arg[n++]);
	  break;

	case 'i':
	case 'd':
	  i = i_arg[n++];

	  if (i < 0)
	    {
	      i = -i;
	      error_char ('-');
	    }

	  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);
	  break;

	case 'C':		/* Current locus */
	case 'L':		/* Specified locus */
	  error_string (have_l1 ? "(2)" : "(1)");
	  have_l1 = 1;
	  break;
	}
    }

  error_char ('\n');
}


/* Wrapper for error_print().  */

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

  va_start (argp, format);
  error_print ("", format, argp);
  va_end (argp);
}


/* Issue a warning.  */

void
gfc_warning (const char *format, ...)
{
  va_list argp;

  if (inhibit_warnings)
    return;

  warning_buffer.flag = 1;
  warning_ptr = warning_buffer.message;
  use_warning_buffer = 1;

  va_start (argp, format);
  if (buffer_flag == 0)
    warnings++;
  error_print ("Warning:", format, argp);
  va_end (argp);

  error_char ('\0');
}


/* 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 FAILURE if
   and error is generated.  */

try
gfc_notify_std (int std, const char *format, ...)
{
  va_list argp;
  bool warning;

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

  if (gfc_suppress_error)
    return warning ? SUCCESS : FAILURE;
  
  if (warning)
    {
      warning_buffer.flag = 1;
      warning_ptr = warning_buffer.message;
      use_warning_buffer = 1;
    }
  else
    {
      error_buffer.flag = 1;
      error_ptr = error_buffer.message;
      use_warning_buffer = 0;
    }

  if (buffer_flag == 0)
    {
      if (warning)
	warnings++;
      else
	errors++;
    }
  va_start (argp, format);
  if (warning)
    error_print ("Warning:", format, argp);
  else
    error_print ("Error:", format, argp);
  va_end (argp);

  error_char ('\0');
  return warning ? SUCCESS : FAILURE;
}


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

void
gfc_warning_now (const char *format, ...)
{
  va_list argp;
  int i;

  if (inhibit_warnings)
    return;

  i = buffer_flag;
  buffer_flag = 0;
  warnings++;

  va_start (argp, format);
  error_print ("Warning:", format, argp);
  va_end (argp);

  error_char ('\0');
  buffer_flag = i;
}


/* Clear the warning flag.  */

void
gfc_clear_warning (void)
{

  warning_buffer.flag = 0;
}


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

void
gfc_warning_check (void)
{

  if (warning_buffer.flag)
    {
      warnings++;
      fputs (warning_buffer.message, stderr);
      warning_buffer.flag = 0;
    }
}


/* Issue an error.  */

void
gfc_error (const char *format, ...)
{
  va_list argp;

  if (gfc_suppress_error)
    return;

  error_buffer.flag = 1;
  error_ptr = error_buffer.message;
  use_warning_buffer = 0;

  va_start (argp, format);
  if (buffer_flag == 0)
    errors++;
  error_print ("Error:", format, argp);
  va_end (argp);

  error_char ('\0');
}


/* Immediate error.  */

void
gfc_error_now (const char *format, ...)
{
  va_list argp;
  int i;

  error_buffer.flag = 1;
  error_ptr = error_buffer.message;

  i = buffer_flag;
  buffer_flag = 0;
  errors++;

  va_start (argp, format);
  error_print ("Error:", format, argp);
  va_end (argp);

  error_char ('\0');
  buffer_flag = i;
}


/* Fatal error, never returns.  */

void
gfc_fatal_error (const char *format, ...)
{
  va_list argp;

  buffer_flag = 0;

  va_start (argp, format);
  error_print ("Fatal Error:", format, argp);
  va_end (argp);

  exit (3);
}


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

void
gfc_internal_error (const char *format, ...)
{
  va_list argp;

  buffer_flag = 0;

  va_start (argp, format);

  show_loci (gfc_current_locus (), NULL);
  error_printf ("Internal Error at (1):");

  error_print ("", format, argp);
  va_end (argp);

  exit (4);
}


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

void
gfc_clear_error (void)
{

  error_buffer.flag = 0;
}


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

int
gfc_error_check (void)
{
  int rc;

  rc = error_buffer.flag;

  if (error_buffer.flag)
    {
      errors++;
      fputs (error_buffer.message, stderr);
      error_buffer.flag = 0;
    }

  return rc;
}


/* Save the existing error state.  */

void
gfc_push_error (gfc_error_buf * err)
{

  err->flag = error_buffer.flag;
  if (error_buffer.flag)
    strcpy (err->message, error_buffer.message);

  error_buffer.flag = 0;
}


/* Restore a previous pushed error state.  */

void
gfc_pop_error (gfc_error_buf * err)
{

  error_buffer.flag = err->flag;
  if (error_buffer.flag)
    strcpy (error_buffer.message, err->message);
}


/* Debug wrapper for printf.  */

void
gfc_status (const char *format, ...)
{
  va_list argp;

  va_start (argp, format);

  vprintf (format, argp);

  va_end (argp);
}


/* Subroutine for outputting a single char so that we don't have to go
   around creating a lot of 1-character strings.  */

void
gfc_status_char (char c)
{
  putchar (c);
}


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

void
gfc_get_errors (int *w, int *e)
{

  if (w != NULL)
    *w = warnings;
  if (e != NULL)
    *e = errors;
}