| 1 | /* messages.c - error reporter - |
| 2 | Copyright (C) 1987-2018 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 | } |