gas/messages.c

   1 /* messages.c - error reporter -
   2    Copyright (C) 1987-2019 Free Software Foundation, Inc.
   3    This file is part of GAS, the GNU Assembler.
   4
   5    GAS is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 3, or (at your option)
   8    any later version.
   9
  10    GAS is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with GAS; see the file COPYING.  If not, write to the Free
  17    Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
  18    02110-1301, USA.  */
  19
  20 #include "as.h"
  21 #include <signal.h>
  22
  23 /* If the system doesn't provide strsignal, we get it defined in
  24    libiberty but no declaration is supplied.  Because, reasons. */
  25 #if !defined (HAVE_STRSIGNAL) && !defined (strsignal)
  26 extern const char *strsignal (int);
  27 #endif
  28
  29 static void identify (const char *);
  30 static void as_show_where (void);
  31 static void as_warn_internal (const char *, unsigned int, char *);
  32 static void as_bad_internal (const char *, unsigned int, char *);
  33 static void signal_crash (int) ATTRIBUTE_NORETURN;
  34
  35 /* Despite the rest of the comments in this file, (FIXME-SOON),
  36    here is the current scheme for error messages etc:
  37
  38    as_fatal() is used when gas is quite confused and
  39    continuing the assembly is pointless.  In this case we
  40    exit immediately with error status.
  41
  42    as_bad() is used to mark errors that result in what we
  43    presume to be a useless object file.  Say, we ignored
  44    something that might have been vital.  If we see any of
  45    these, assembly will continue to the end of the source,
  46    no object file will be produced, and we will terminate
  47    with error status.  The new option, -Z, tells us to
  48    produce an object file anyway but we still exit with
  49    error status.  The assumption here is that you don't want
  50    this object file but we could be wrong.
  51
  52    as_warn() is used when we have an error from which we
  53    have a plausible error recovery.  eg, masking the top
  54    bits of a constant that is longer than will fit in the
  55    destination.  In this case we will continue to assemble
  56    the source, although we may have made a bad assumption,
  57    and we will produce an object file and return normal exit
  58    status (ie, no error).  The new option -X tells us to
  59    treat all as_warn() errors as as_bad() errors.  That is,
  60    no object file will be produced and we will exit with
  61    error status.  The idea here is that we don't kill an
  62    entire make because of an error that we knew how to
  63    correct.  On the other hand, sometimes you might want to
  64    stop the make at these points.
  65
  66    as_tsktsk() is used when we see a minor error for which
  67    our error recovery action is almost certainly correct.
  68    In this case, we print a message and then assembly
  69    continues as though no error occurred.
  70
  71    as_abort () is used for logic failure (assert or abort, signal).
  72 */
  73
  74 static void
  75 identify (const char *file)
  76 {
  77   static int identified;
  78
  79   if (identified)
  80     return;
  81   identified++;
  82
  83   if (!file)
  84     {
  85       unsigned int x;
  86       file = as_where (&x);
  87     }
  88
  89   if (file)
  90     fprintf (stderr, "%s: ", file);
  91   fprintf (stderr, _("Assembler messages:\n"));
  92 }
  93
  94 /* The number of warnings issued.  */
  95 static int warning_count;
  96
  97 int
  98 had_warnings (void)
  99 {
 100   return warning_count;
 101 }
 102
 103 /* Nonzero if we've hit a 'bad error', and should not write an obj file,
 104    and exit with a nonzero error code.  */
 105
 106 static int error_count;
 107
 108 int
 109 had_errors (void)
 110 {
 111   return error_count;
 112 }
 113
 114 /* Print the current location to stderr.  */
 115
 116 static void
 117 as_show_where (void)
 118 {
 119   const char *file;
 120   unsigned int line;
 121
 122   file = as_where (&line);
 123   identify (file);
 124   if (file)
 125     {
 126       if (line != 0)
 127         fprintf (stderr, "%s:%u: ", file, line);
 128       else
 129         fprintf (stderr, "%s: ", file);
 130     }
 131 }
 132
 133 /* Send to stderr a string as a warning, and locate warning
 134    in input file(s).
 135    Please only use this for when we have some recovery action.
 136    Please explain in string (which may have '\n's) what recovery was
 137    done.  */
 138
 139 void
 140 as_tsktsk (const char *format, ...)
 141 {
 142   va_list args;
 143
 144   as_show_where ();
 145   va_start (args, format);
 146   vfprintf (stderr, format, args);
 147   va_end (args);
 148   (void) putc ('\n', stderr);
 149 }
 150
 151 /* The common portion of as_warn and as_warn_where.  */
 152
 153 static void
 154 as_warn_internal (const char *file, unsigned int line, char *buffer)
 155 {
 156   ++warning_count;
 157
 158   if (file == NULL)
 159     file = as_where (&line);
 160
 161   identify (file);
 162   if (file)
 163     {
 164       if (line != 0)
 165         fprintf (stderr, "%s:%u: %s%s\n", file, line, _("Warning: "), buffer);
 166       else
 167         fprintf (stderr, "%s: %s%s\n", file, _("Warning: "), buffer);
 168     }
 169   else
 170     fprintf (stderr, "%s%s\n", _("Warning: "), buffer);
 171 #ifndef NO_LISTING
 172   listing_warning (buffer);
 173 #endif
 174 }
 175
 176 /* Send to stderr a string as a warning, and locate warning
 177    in input file(s).
 178    Please only use this for when we have some recovery action.
 179    Please explain in string (which may have '\n's) what recovery was
 180    done.  */
 181
 182 void
 183 as_warn (const char *format, ...)
 184 {
 185   va_list args;
 186   char buffer[2000];
 187
 188   if (!flag_no_warnings)
 189     {
 190       va_start (args, format);
 191       vsnprintf (buffer, sizeof (buffer), format, args);
 192       va_end (args);
 193       as_warn_internal ((char *) NULL, 0, buffer);
 194     }
 195 }
 196
 197 /* Like as_bad but the file name and line number are passed in.
 198    Unfortunately, we have to repeat the function in order to handle
 199    the varargs correctly and portably.  */
 200
 201 void
 202 as_warn_where (const char *file, unsigned int line, const char *format, ...)
 203 {
 204   va_list args;
 205   char buffer[2000];
 206
 207   if (!flag_no_warnings)
 208     {
 209       va_start (args, format);
 210       vsnprintf (buffer, sizeof (buffer), format, args);
 211       va_end (args);
 212       as_warn_internal (file, line, buffer);
 213     }
 214 }
 215
 216 /* The common portion of as_bad and as_bad_where.  */
 217
 218 static void
 219 as_bad_internal (const char *file, unsigned int line, char *buffer)
 220 {
 221   ++error_count;
 222
 223   if (file == NULL)
 224     file = as_where (&line);
 225
 226   identify (file);
 227   if (file)
 228     {
 229       if (line != 0)
 230         fprintf (stderr, "%s:%u: %s%s\n", file, line, _("Error: "), buffer);
 231       else
 232         fprintf (stderr, "%s: %s%s\n", file, _("Error: "), buffer);
 233     }
 234   else
 235     fprintf (stderr, "%s%s\n", _("Error: "), buffer);
 236 #ifndef NO_LISTING
 237   listing_error (buffer);
 238 #endif
 239 }
 240
 241 /* Send to stderr a string as a warning, and locate warning in input
 242    file(s).  Please use when there is no recovery, but we want to
 243    continue processing but not produce an object file.
 244    Please explain in string (which may have '\n's) what recovery was
 245    done.  */
 246
 247 void
 248 as_bad (const char *format, ...)
 249 {
 250   va_list args;
 251   char buffer[2000];
 252
 253   va_start (args, format);
 254   vsnprintf (buffer, sizeof (buffer), format, args);
 255   va_end (args);
 256
 257   as_bad_internal ((char *) NULL, 0, buffer);
 258 }
 259
 260 /* Like as_bad but the file name and line number are passed in.
 261    Unfortunately, we have to repeat the function in order to handle
 262    the varargs correctly and portably.  */
 263
 264 void
 265 as_bad_where (const char *file, unsigned int line, const char *format, ...)
 266 {
 267   va_list args;
 268   char buffer[2000];
 269
 270   va_start (args, format);
 271   vsnprintf (buffer, sizeof (buffer), format, args);
 272   va_end (args);
 273
 274   as_bad_internal (file, line, buffer);
 275 }
 276
 277 /* Send to stderr a string as a fatal message, and print location of
 278    error in input file(s).
 279    Please only use this for when we DON'T have some recovery action.
 280    It xexit()s with a warning status.  */
 281
 282 void
 283 as_fatal (const char *format, ...)
 284 {
 285   va_list args;
 286
 287   as_show_where ();
 288   va_start (args, format);
 289   fprintf (stderr, _("Fatal error: "));
 290   vfprintf (stderr, format, args);
 291   (void) putc ('\n', stderr);
 292   va_end (args);
 293   /* Delete the output file, if it exists.  This will prevent make from
 294      thinking that a file was created and hence does not need rebuilding.  */
 295   if (out_file_name != NULL)
 296     unlink_if_ordinary (out_file_name);
 297   xexit (EXIT_FAILURE);
 298 }
 299
 300 /* Indicate internal constency error.
 301    Arguments: Filename, line number, optional function name.
 302    FILENAME may be NULL, which we use for crash-via-signal.  */
 303
 304 void
 305 as_abort (const char *file, int line, const char *fn)
 306 {
 307   as_show_where ();
 308
 309   if (!file)
 310     fprintf (stderr, _("Internal error (%s).\n"), fn ? fn : "unknown");
 311   else if (fn)
 312     fprintf (stderr, _("Internal error in %s at %s:%d.\n"), fn, file, line);
 313   else
 314     fprintf (stderr, _("Internal error at %s:%d.\n"), file, line);
 315
 316   fprintf (stderr, _("Please report this bug.\n"));
 317
 318   xexit (EXIT_FAILURE);
 319 }
 320
 321 /* Handler for fatal signals, such as SIGSEGV. */
 322
 323 static void
 324 signal_crash (int signo)
 325 {
 326   /* Reset, to prevent unbounded recursion.  */
 327   signal (signo, SIG_DFL);
 328
 329   as_abort (NULL, 0, strsignal (signo));
 330 }
 331
 332 /* Register signal handlers, for less abrubt crashes.  */
 333
 334 void
 335 signal_init (void)
 336 {
 337 #ifdef SIGSEGV
 338   signal (SIGSEGV, signal_crash);
 339 #endif
 340 #ifdef SIGILL
 341   signal (SIGILL, signal_crash);
 342 #endif
 343 #ifdef SIGBUS
 344   signal (SIGBUS, signal_crash);
 345 #endif
 346 #ifdef SIGABRT
 347   signal (SIGABRT, signal_crash);
 348 #endif
 349 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
 350   signal (SIGIOT, signal_crash);
 351 #endif
 352 #ifdef SIGFPE
 353   signal (SIGFPE, signal_crash);
 354 #endif
 355 }
 356
 357 /* Support routines.  */
 358
 359 void
 360 sprint_value (char *buf, valueT val)
 361 {
 362   if (sizeof (val) <= sizeof (long))
 363     {
 364       sprintf (buf, "%ld", (long) val);
 365       return;
 366     }
 367   if (sizeof (val) <= sizeof (bfd_vma))
 368     {
 369       sprintf_vma (buf, val);
 370       return;
 371     }
 372   abort ();
 373 }
 374
 375 #define HEX_MAX_THRESHOLD       1024
 376 #define HEX_MIN_THRESHOLD       -(HEX_MAX_THRESHOLD)
 377
 378 static void
 379 as_internal_value_out_of_range (const char *prefix,
 380                                 offsetT val,
 381                                 offsetT min,
 382                                 offsetT max,
 383                                 const char *file,
 384                                 unsigned line,
 385                                 int bad)
 386 {
 387   const char * err;
 388
 389   if (prefix == NULL)
 390     prefix = "";
 391
 392   if (val >= min && val <= max)
 393     {
 394       addressT right = max & -max;
 395
 396       if (max <= 1)
 397         abort ();
 398
 399       /* xgettext:c-format  */
 400       err = _("%s out of domain (%d is not a multiple of %d)");
 401       if (bad)
 402         as_bad_where (file, line, err,
 403                       prefix, (int) val, (int) right);
 404       else
 405         as_warn_where (file, line, err,
 406                        prefix, (int) val, (int) right);
 407       return;
 408     }
 409
 410   if (   val < HEX_MAX_THRESHOLD
 411       && min < HEX_MAX_THRESHOLD
 412       && max < HEX_MAX_THRESHOLD
 413       && val > HEX_MIN_THRESHOLD
 414       && min > HEX_MIN_THRESHOLD
 415       && max > HEX_MIN_THRESHOLD)
 416     {
 417       /* xgettext:c-format  */
 418       err = _("%s out of range (%d is not between %d and %d)");
 419
 420       if (bad)
 421         as_bad_where (file, line, err,
 422                       prefix, (int) val, (int) min, (int) max);
 423       else
 424         as_warn_where (file, line, err,
 425                        prefix, (int) val, (int) min, (int) max);
 426     }
 427   else
 428     {
 429       char val_buf [sizeof (val) * 3 + 2];
 430       char min_buf [sizeof (val) * 3 + 2];
 431       char max_buf [sizeof (val) * 3 + 2];
 432
 433       if (sizeof (val) > sizeof (bfd_vma))
 434         abort ();
 435
 436       sprintf_vma (val_buf, (bfd_vma) val);
 437       sprintf_vma (min_buf, (bfd_vma) min);
 438       sprintf_vma (max_buf, (bfd_vma) max);
 439
 440       /* xgettext:c-format.  */
 441       err = _("%s out of range (0x%s is not between 0x%s and 0x%s)");
 442
 443       if (bad)
 444         as_bad_where (file, line, err, prefix, val_buf, min_buf, max_buf);
 445       else
 446         as_warn_where (file, line, err, prefix, val_buf, min_buf, max_buf);
 447     }
 448 }
 449
 450 void
 451 as_warn_value_out_of_range (const char *prefix,
 452                            offsetT value,
 453                            offsetT min,
 454                            offsetT max,
 455                            const char *file,
 456                            unsigned line)
 457 {
 458   as_internal_value_out_of_range (prefix, value, min, max, file, line, 0);
 459 }
 460
 461 void
 462 as_bad_value_out_of_range (const char *prefix,
 463                            offsetT value,
 464                            offsetT min,
 465                            offsetT max,
 466                            const char *file,
 467                            unsigned line)
 468 {
 469   as_internal_value_out_of_range (prefix, value, min, max, file, line, 1);
 470 }