Stefan Reinauer | d37ab45 | 2012-12-18 16:23:28 -0800 | [diff] [blame] | 1 | /* File format for coverage information |
| 2 | Copyright (C) 1996, 1997, 1998, 2000, 2002, 2003, 2004, 2005, 2007, |
| 3 | 2008 Free Software Foundation, Inc. |
| 4 | Contributed by Bob Manson <manson@cygnus.com>. |
| 5 | Completely remangled by Nathan Sidwell <nathan@codesourcery.com>. |
| 6 | |
| 7 | This file is part of GCC. |
| 8 | |
| 9 | GCC is free software; you can redistribute it and/or modify it under |
| 10 | the terms of the GNU General Public License as published by the Free |
| 11 | Software Foundation; either version 3, or (at your option) any later |
| 12 | version. |
| 13 | |
| 14 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY |
| 15 | WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 16 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 17 | for more details. |
| 18 | |
| 19 | Under Section 7 of GPL version 3, you are granted additional |
| 20 | permissions described in the GCC Runtime Library Exception, version |
| 21 | 3.1, as published by the Free Software Foundation. |
Patrick Georgi | a73b931 | 2015-10-31 11:55:10 +0100 | [diff] [blame] | 22 | */ |
Stefan Reinauer | d37ab45 | 2012-12-18 16:23:28 -0800 | [diff] [blame] | 23 | |
| 24 | /* Routines declared in gcov-io.h. This file should be #included by |
| 25 | another source file, after having #included gcov-io.h. */ |
| 26 | |
| 27 | #if !IN_GCOV |
Lee Leahy | 75b8599 | 2017-03-08 16:34:12 -0800 | [diff] [blame] | 28 | static void gcov_write_block (unsigned int); |
| 29 | static gcov_unsigned_t *gcov_write_words (unsigned int); |
Stefan Reinauer | d37ab45 | 2012-12-18 16:23:28 -0800 | [diff] [blame] | 30 | #endif |
Lee Leahy | 75b8599 | 2017-03-08 16:34:12 -0800 | [diff] [blame] | 31 | static const gcov_unsigned_t *gcov_read_words (unsigned int); |
Stefan Reinauer | d37ab45 | 2012-12-18 16:23:28 -0800 | [diff] [blame] | 32 | #if !IN_LIBGCOV |
Lee Leahy | 75b8599 | 2017-03-08 16:34:12 -0800 | [diff] [blame] | 33 | static void gcov_allocate (unsigned int); |
Stefan Reinauer | d37ab45 | 2012-12-18 16:23:28 -0800 | [diff] [blame] | 34 | #endif |
| 35 | |
| 36 | static inline gcov_unsigned_t from_file (gcov_unsigned_t value) |
| 37 | { |
| 38 | #if !IN_LIBGCOV |
| 39 | if (gcov_var.endian) |
| 40 | { |
| 41 | value = (value >> 16) | (value << 16); |
| 42 | value = ((value & 0xff00ff) << 8) | ((value >> 8) & 0xff00ff); |
| 43 | } |
| 44 | #endif |
| 45 | return value; |
| 46 | } |
| 47 | |
| 48 | /* Open a gcov file. NAME is the name of the file to open and MODE |
| 49 | indicates whether a new file should be created, or an existing file |
| 50 | opened. If MODE is >= 0 an existing file will be opened, if |
| 51 | possible, and if MODE is <= 0, a new file will be created. Use |
| 52 | MODE=0 to attempt to reopen an existing file and then fall back on |
| 53 | creating a new one. If MODE < 0, the file will be opened in |
| 54 | read-only mode. Otherwise it will be opened for modification. |
| 55 | Return zero on failure, >0 on opening an existing file and <0 on |
| 56 | creating a new one. */ |
| 57 | |
| 58 | GCOV_LINKAGE int |
| 59 | #if IN_LIBGCOV |
| 60 | gcov_open (const char *name) |
| 61 | #else |
| 62 | gcov_open (const char *name, int mode) |
| 63 | #endif |
| 64 | { |
| 65 | #if IN_LIBGCOV |
| 66 | const int mode = 0; |
| 67 | #endif |
| 68 | #if GCOV_LOCKED |
| 69 | struct flock s_flock; |
| 70 | int fd; |
| 71 | |
| 72 | s_flock.l_whence = SEEK_SET; |
| 73 | s_flock.l_start = 0; |
| 74 | s_flock.l_len = 0; /* Until EOF. */ |
| 75 | s_flock.l_pid = getpid (); |
| 76 | #endif |
| 77 | |
| 78 | gcc_assert (!gcov_var.file); |
| 79 | gcov_var.start = 0; |
| 80 | gcov_var.offset = gcov_var.length = 0; |
| 81 | gcov_var.overread = -1u; |
| 82 | gcov_var.error = 0; |
| 83 | #if !IN_LIBGCOV |
| 84 | gcov_var.endian = 0; |
| 85 | #endif |
| 86 | #if GCOV_LOCKED |
| 87 | if (mode > 0) |
| 88 | { |
| 89 | /* Read-only mode - acquire a read-lock. */ |
| 90 | s_flock.l_type = F_RDLCK; |
| 91 | fd = open (name, O_RDONLY); |
| 92 | } |
| 93 | else |
| 94 | { |
| 95 | /* Write mode - acquire a write-lock. */ |
| 96 | s_flock.l_type = F_WRLCK; |
| 97 | fd = open (name, O_RDWR | O_CREAT, 0666); |
| 98 | } |
| 99 | if (fd < 0) |
| 100 | return 0; |
| 101 | |
| 102 | while (fcntl (fd, F_SETLKW, &s_flock) && errno == EINTR) |
| 103 | continue; |
| 104 | |
| 105 | gcov_var.file = fdopen (fd, (mode > 0) ? "rb" : "r+b"); |
| 106 | |
| 107 | if (!gcov_var.file) |
| 108 | { |
| 109 | close (fd); |
| 110 | return 0; |
| 111 | } |
| 112 | |
| 113 | if (mode > 0) |
| 114 | gcov_var.mode = 1; |
| 115 | else if (mode == 0) |
| 116 | { |
| 117 | struct stat st; |
| 118 | |
| 119 | if (fstat (fd, &st) < 0) |
| 120 | { |
| 121 | fclose (gcov_var.file); |
| 122 | gcov_var.file = 0; |
| 123 | return 0; |
| 124 | } |
| 125 | if (st.st_size != 0) |
| 126 | gcov_var.mode = 1; |
| 127 | else |
| 128 | gcov_var.mode = mode * 2 + 1; |
| 129 | } |
| 130 | else |
| 131 | gcov_var.mode = mode * 2 + 1; |
| 132 | #else |
| 133 | if (mode >= 0) |
| 134 | gcov_var.file = fopen (name, (mode > 0) ? "rb" : "r+b"); |
| 135 | |
| 136 | if (gcov_var.file) |
| 137 | gcov_var.mode = 1; |
| 138 | else if (mode <= 0) |
| 139 | { |
| 140 | gcov_var.file = fopen (name, "w+b"); |
| 141 | if (gcov_var.file) |
| 142 | gcov_var.mode = mode * 2 + 1; |
| 143 | } |
| 144 | if (!gcov_var.file) |
| 145 | return 0; |
| 146 | #endif |
| 147 | |
| 148 | setbuf (gcov_var.file, (char *)0); |
| 149 | |
| 150 | return 1; |
| 151 | } |
| 152 | |
| 153 | /* Close the current gcov file. Flushes data to disk. Returns nonzero |
| 154 | on failure or error flag set. */ |
| 155 | |
| 156 | GCOV_LINKAGE int |
| 157 | gcov_close (void) |
| 158 | { |
| 159 | if (gcov_var.file) |
| 160 | { |
| 161 | #if !IN_GCOV |
| 162 | if (gcov_var.offset && gcov_var.mode < 0) |
| 163 | gcov_write_block (gcov_var.offset); |
| 164 | #endif |
| 165 | fclose (gcov_var.file); |
| 166 | gcov_var.file = 0; |
| 167 | gcov_var.length = 0; |
| 168 | } |
| 169 | #if !IN_LIBGCOV |
| 170 | free (gcov_var.buffer); |
| 171 | gcov_var.alloc = 0; |
| 172 | gcov_var.buffer = 0; |
| 173 | #endif |
| 174 | gcov_var.mode = 0; |
| 175 | return gcov_var.error; |
| 176 | } |
| 177 | |
| 178 | #if !IN_LIBGCOV |
| 179 | /* Check if MAGIC is EXPECTED. Use it to determine endianness of the |
| 180 | file. Returns +1 for same endian, -1 for other endian and zero for |
| 181 | not EXPECTED. */ |
| 182 | |
| 183 | GCOV_LINKAGE int |
| 184 | gcov_magic (gcov_unsigned_t magic, gcov_unsigned_t expected) |
| 185 | { |
| 186 | if (magic == expected) |
| 187 | return 1; |
| 188 | magic = (magic >> 16) | (magic << 16); |
| 189 | magic = ((magic & 0xff00ff) << 8) | ((magic >> 8) & 0xff00ff); |
| 190 | if (magic == expected) |
| 191 | { |
| 192 | gcov_var.endian = 1; |
| 193 | return -1; |
| 194 | } |
| 195 | return 0; |
| 196 | } |
| 197 | #endif |
| 198 | |
| 199 | #if !IN_LIBGCOV |
| 200 | static void |
Lee Leahy | 75b8599 | 2017-03-08 16:34:12 -0800 | [diff] [blame] | 201 | gcov_allocate (unsigned int length) |
Stefan Reinauer | d37ab45 | 2012-12-18 16:23:28 -0800 | [diff] [blame] | 202 | { |
| 203 | size_t new_size = gcov_var.alloc; |
| 204 | |
| 205 | if (!new_size) |
| 206 | new_size = GCOV_BLOCK_SIZE; |
| 207 | new_size += length; |
| 208 | new_size *= 2; |
| 209 | |
| 210 | gcov_var.alloc = new_size; |
| 211 | gcov_var.buffer = XRESIZEVAR (gcov_unsigned_t, gcov_var.buffer, new_size << 2); |
| 212 | } |
| 213 | #endif |
| 214 | |
| 215 | #if !IN_GCOV |
| 216 | /* Write out the current block, if needs be. */ |
| 217 | |
| 218 | static void |
Lee Leahy | 75b8599 | 2017-03-08 16:34:12 -0800 | [diff] [blame] | 219 | gcov_write_block (unsigned int size) |
Stefan Reinauer | d37ab45 | 2012-12-18 16:23:28 -0800 | [diff] [blame] | 220 | { |
| 221 | if (fwrite (gcov_var.buffer, size << 2, 1, gcov_var.file) != 1) |
| 222 | gcov_var.error = 1; |
| 223 | gcov_var.start += size; |
| 224 | gcov_var.offset -= size; |
| 225 | } |
| 226 | |
| 227 | /* Allocate space to write BYTES bytes to the gcov file. Return a |
| 228 | pointer to those bytes, or NULL on failure. */ |
| 229 | |
| 230 | static gcov_unsigned_t * |
Lee Leahy | 75b8599 | 2017-03-08 16:34:12 -0800 | [diff] [blame] | 231 | gcov_write_words (unsigned int words) |
Stefan Reinauer | d37ab45 | 2012-12-18 16:23:28 -0800 | [diff] [blame] | 232 | { |
| 233 | gcov_unsigned_t *result; |
| 234 | |
| 235 | gcc_assert (gcov_var.mode < 0); |
| 236 | #if IN_LIBGCOV |
| 237 | if (gcov_var.offset >= GCOV_BLOCK_SIZE) |
| 238 | { |
| 239 | gcov_write_block (GCOV_BLOCK_SIZE); |
| 240 | if (gcov_var.offset) |
| 241 | { |
| 242 | gcc_assert (gcov_var.offset == 1); |
| 243 | memcpy (gcov_var.buffer, gcov_var.buffer + GCOV_BLOCK_SIZE, 4); |
| 244 | } |
| 245 | } |
| 246 | #else |
| 247 | if (gcov_var.offset + words > gcov_var.alloc) |
| 248 | gcov_allocate (gcov_var.offset + words); |
| 249 | #endif |
| 250 | result = &gcov_var.buffer[gcov_var.offset]; |
| 251 | gcov_var.offset += words; |
| 252 | |
| 253 | return result; |
| 254 | } |
| 255 | |
| 256 | /* Write unsigned VALUE to coverage file. Sets error flag |
| 257 | appropriately. */ |
| 258 | |
| 259 | GCOV_LINKAGE void |
| 260 | gcov_write_unsigned (gcov_unsigned_t value) |
| 261 | { |
| 262 | gcov_unsigned_t *buffer = gcov_write_words (1); |
| 263 | |
| 264 | buffer[0] = value; |
| 265 | } |
| 266 | |
| 267 | /* Write counter VALUE to coverage file. Sets error flag |
| 268 | appropriately. */ |
| 269 | |
| 270 | #if IN_LIBGCOV |
| 271 | GCOV_LINKAGE void |
| 272 | gcov_write_counter (gcov_type value) |
| 273 | { |
| 274 | gcov_unsigned_t *buffer = gcov_write_words (2); |
| 275 | |
| 276 | buffer[0] = (gcov_unsigned_t) value; |
| 277 | if (sizeof (value) > sizeof (gcov_unsigned_t)) |
| 278 | buffer[1] = (gcov_unsigned_t) (value >> 32); |
| 279 | else |
| 280 | buffer[1] = 0; |
| 281 | } |
| 282 | #endif /* IN_LIBGCOV */ |
| 283 | |
| 284 | #if !IN_LIBGCOV |
| 285 | /* Write STRING to coverage file. Sets error flag on file |
| 286 | error, overflow flag on overflow */ |
| 287 | |
| 288 | GCOV_LINKAGE void |
| 289 | gcov_write_string (const char *string) |
| 290 | { |
Lee Leahy | 75b8599 | 2017-03-08 16:34:12 -0800 | [diff] [blame] | 291 | unsigned int length = 0; |
| 292 | unsigned int alloc = 0; |
Stefan Reinauer | d37ab45 | 2012-12-18 16:23:28 -0800 | [diff] [blame] | 293 | gcov_unsigned_t *buffer; |
| 294 | |
| 295 | if (string) |
| 296 | { |
| 297 | length = strlen (string); |
| 298 | alloc = (length + 4) >> 2; |
| 299 | } |
| 300 | |
| 301 | buffer = gcov_write_words (1 + alloc); |
| 302 | |
| 303 | buffer[0] = alloc; |
| 304 | buffer[alloc] = 0; |
| 305 | memcpy (&buffer[1], string, length); |
| 306 | } |
| 307 | #endif |
| 308 | |
| 309 | #if !IN_LIBGCOV |
| 310 | /* Write a tag TAG and reserve space for the record length. Return a |
| 311 | value to be used for gcov_write_length. */ |
| 312 | |
| 313 | GCOV_LINKAGE gcov_position_t |
| 314 | gcov_write_tag (gcov_unsigned_t tag) |
| 315 | { |
| 316 | gcov_position_t result = gcov_var.start + gcov_var.offset; |
| 317 | gcov_unsigned_t *buffer = gcov_write_words (2); |
| 318 | |
| 319 | buffer[0] = tag; |
| 320 | buffer[1] = 0; |
| 321 | |
| 322 | return result; |
| 323 | } |
| 324 | |
| 325 | /* Write a record length using POSITION, which was returned by |
| 326 | gcov_write_tag. The current file position is the end of the |
| 327 | record, and is restored before returning. Returns nonzero on |
| 328 | overflow. */ |
| 329 | |
| 330 | GCOV_LINKAGE void |
| 331 | gcov_write_length (gcov_position_t position) |
| 332 | { |
Lee Leahy | 75b8599 | 2017-03-08 16:34:12 -0800 | [diff] [blame] | 333 | unsigned int offset; |
Stefan Reinauer | d37ab45 | 2012-12-18 16:23:28 -0800 | [diff] [blame] | 334 | gcov_unsigned_t length; |
| 335 | gcov_unsigned_t *buffer; |
| 336 | |
| 337 | gcc_assert (gcov_var.mode < 0); |
| 338 | gcc_assert (position + 2 <= gcov_var.start + gcov_var.offset); |
| 339 | gcc_assert (position >= gcov_var.start); |
| 340 | offset = position - gcov_var.start; |
| 341 | length = gcov_var.offset - offset - 2; |
| 342 | buffer = (gcov_unsigned_t *) &gcov_var.buffer[offset]; |
| 343 | buffer[1] = length; |
| 344 | if (gcov_var.offset >= GCOV_BLOCK_SIZE) |
| 345 | gcov_write_block (gcov_var.offset); |
| 346 | } |
| 347 | |
| 348 | #else /* IN_LIBGCOV */ |
| 349 | |
| 350 | /* Write a tag TAG and length LENGTH. */ |
| 351 | |
| 352 | GCOV_LINKAGE void |
| 353 | gcov_write_tag_length (gcov_unsigned_t tag, gcov_unsigned_t length) |
| 354 | { |
| 355 | gcov_unsigned_t *buffer = gcov_write_words (2); |
| 356 | |
| 357 | buffer[0] = tag; |
| 358 | buffer[1] = length; |
| 359 | } |
| 360 | |
| 361 | /* Write a summary structure to the gcov file. Return nonzero on |
| 362 | overflow. */ |
| 363 | |
| 364 | GCOV_LINKAGE void |
| 365 | gcov_write_summary (gcov_unsigned_t tag, const struct gcov_summary *summary) |
| 366 | { |
Lee Leahy | 75b8599 | 2017-03-08 16:34:12 -0800 | [diff] [blame] | 367 | unsigned int ix; |
Stefan Reinauer | d37ab45 | 2012-12-18 16:23:28 -0800 | [diff] [blame] | 368 | const struct gcov_ctr_summary *csum; |
| 369 | |
| 370 | gcov_write_tag_length (tag, GCOV_TAG_SUMMARY_LENGTH); |
| 371 | gcov_write_unsigned (summary->checksum); |
| 372 | for (csum = summary->ctrs, ix = GCOV_COUNTERS_SUMMABLE; ix--; csum++) |
| 373 | { |
| 374 | gcov_write_unsigned (csum->num); |
| 375 | gcov_write_unsigned (csum->runs); |
| 376 | gcov_write_counter (csum->sum_all); |
| 377 | gcov_write_counter (csum->run_max); |
| 378 | gcov_write_counter (csum->sum_max); |
| 379 | } |
| 380 | } |
| 381 | #endif /* IN_LIBGCOV */ |
| 382 | |
| 383 | #endif /*!IN_GCOV */ |
| 384 | |
| 385 | /* Return a pointer to read BYTES bytes from the gcov file. Returns |
| 386 | NULL on failure (read past EOF). */ |
| 387 | |
| 388 | static const gcov_unsigned_t * |
Lee Leahy | 75b8599 | 2017-03-08 16:34:12 -0800 | [diff] [blame] | 389 | gcov_read_words (unsigned int words) |
Stefan Reinauer | d37ab45 | 2012-12-18 16:23:28 -0800 | [diff] [blame] | 390 | { |
| 391 | const gcov_unsigned_t *result; |
Lee Leahy | 75b8599 | 2017-03-08 16:34:12 -0800 | [diff] [blame] | 392 | unsigned int excess = gcov_var.length - gcov_var.offset; |
Stefan Reinauer | d37ab45 | 2012-12-18 16:23:28 -0800 | [diff] [blame] | 393 | |
| 394 | gcc_assert (gcov_var.mode > 0); |
| 395 | if (excess < words) |
| 396 | { |
| 397 | gcov_var.start += gcov_var.offset; |
| 398 | #if IN_LIBGCOV |
| 399 | if (excess) |
| 400 | { |
| 401 | gcc_assert (excess == 1); |
| 402 | memcpy (gcov_var.buffer, gcov_var.buffer + gcov_var.offset, 4); |
| 403 | } |
| 404 | #else |
| 405 | memmove (gcov_var.buffer, gcov_var.buffer + gcov_var.offset, excess * 4); |
| 406 | #endif |
| 407 | gcov_var.offset = 0; |
| 408 | gcov_var.length = excess; |
| 409 | #if IN_LIBGCOV |
| 410 | gcc_assert (!gcov_var.length || gcov_var.length == 1); |
| 411 | excess = GCOV_BLOCK_SIZE; |
| 412 | #else |
| 413 | if (gcov_var.length + words > gcov_var.alloc) |
| 414 | gcov_allocate (gcov_var.length + words); |
| 415 | excess = gcov_var.alloc - gcov_var.length; |
| 416 | #endif |
| 417 | excess = fread (gcov_var.buffer + gcov_var.length, |
| 418 | 1, excess << 2, gcov_var.file) >> 2; |
| 419 | gcov_var.length += excess; |
| 420 | if (gcov_var.length < words) |
| 421 | { |
| 422 | gcov_var.overread += words - gcov_var.length; |
| 423 | gcov_var.length = 0; |
| 424 | return 0; |
| 425 | } |
| 426 | } |
| 427 | result = &gcov_var.buffer[gcov_var.offset]; |
| 428 | gcov_var.offset += words; |
| 429 | return result; |
| 430 | } |
| 431 | |
| 432 | /* Read unsigned value from a coverage file. Sets error flag on file |
| 433 | error, overflow flag on overflow */ |
| 434 | |
| 435 | GCOV_LINKAGE gcov_unsigned_t |
| 436 | gcov_read_unsigned (void) |
| 437 | { |
| 438 | gcov_unsigned_t value; |
| 439 | const gcov_unsigned_t *buffer = gcov_read_words (1); |
| 440 | |
| 441 | if (!buffer) |
| 442 | return 0; |
| 443 | value = from_file (buffer[0]); |
| 444 | return value; |
| 445 | } |
| 446 | |
| 447 | /* Read counter value from a coverage file. Sets error flag on file |
| 448 | error, overflow flag on overflow */ |
| 449 | |
| 450 | GCOV_LINKAGE gcov_type |
| 451 | gcov_read_counter (void) |
| 452 | { |
| 453 | gcov_type value; |
| 454 | const gcov_unsigned_t *buffer = gcov_read_words (2); |
| 455 | |
| 456 | if (!buffer) |
| 457 | return 0; |
| 458 | value = from_file (buffer[0]); |
| 459 | if (sizeof (value) > sizeof (gcov_unsigned_t)) |
| 460 | value |= ((gcov_type) from_file (buffer[1])) << 32; |
| 461 | else if (buffer[1]) |
| 462 | gcov_var.error = -1; |
| 463 | |
| 464 | return value; |
| 465 | } |
| 466 | |
| 467 | /* Read string from coverage file. Returns a pointer to a static |
| 468 | buffer, or NULL on empty string. You must copy the string before |
| 469 | calling another gcov function. */ |
| 470 | |
| 471 | #if !IN_LIBGCOV |
| 472 | GCOV_LINKAGE const char * |
| 473 | gcov_read_string (void) |
| 474 | { |
Lee Leahy | 75b8599 | 2017-03-08 16:34:12 -0800 | [diff] [blame] | 475 | unsigned int length = gcov_read_unsigned (); |
Stefan Reinauer | d37ab45 | 2012-12-18 16:23:28 -0800 | [diff] [blame] | 476 | |
| 477 | if (!length) |
| 478 | return 0; |
| 479 | |
| 480 | return (const char *) gcov_read_words (length); |
| 481 | } |
| 482 | #endif |
| 483 | |
| 484 | GCOV_LINKAGE void |
| 485 | gcov_read_summary (struct gcov_summary *summary) |
| 486 | { |
Lee Leahy | 75b8599 | 2017-03-08 16:34:12 -0800 | [diff] [blame] | 487 | unsigned int ix; |
Stefan Reinauer | d37ab45 | 2012-12-18 16:23:28 -0800 | [diff] [blame] | 488 | struct gcov_ctr_summary *csum; |
| 489 | |
| 490 | summary->checksum = gcov_read_unsigned (); |
| 491 | for (csum = summary->ctrs, ix = GCOV_COUNTERS_SUMMABLE; ix--; csum++) |
| 492 | { |
| 493 | csum->num = gcov_read_unsigned (); |
| 494 | csum->runs = gcov_read_unsigned (); |
| 495 | csum->sum_all = gcov_read_counter (); |
| 496 | csum->run_max = gcov_read_counter (); |
| 497 | csum->sum_max = gcov_read_counter (); |
| 498 | } |
| 499 | } |
| 500 | |
| 501 | #if !IN_LIBGCOV |
| 502 | /* Reset to a known position. BASE should have been obtained from |
| 503 | gcov_position, LENGTH should be a record length. */ |
| 504 | |
| 505 | GCOV_LINKAGE void |
| 506 | gcov_sync (gcov_position_t base, gcov_unsigned_t length) |
| 507 | { |
| 508 | gcc_assert (gcov_var.mode > 0); |
| 509 | base += length; |
| 510 | if (base - gcov_var.start <= gcov_var.length) |
| 511 | gcov_var.offset = base - gcov_var.start; |
| 512 | else |
| 513 | { |
| 514 | gcov_var.offset = gcov_var.length = 0; |
| 515 | fseek (gcov_var.file, base << 2, SEEK_SET); |
| 516 | gcov_var.start = ftell (gcov_var.file) >> 2; |
| 517 | } |
| 518 | } |
| 519 | #endif |
| 520 | |
| 521 | #if IN_LIBGCOV |
| 522 | /* Move to a given position in a gcov file. */ |
| 523 | |
| 524 | GCOV_LINKAGE void |
| 525 | gcov_seek (gcov_position_t base) |
| 526 | { |
| 527 | gcc_assert (gcov_var.mode < 0); |
| 528 | if (gcov_var.offset) |
| 529 | gcov_write_block (gcov_var.offset); |
| 530 | fseek (gcov_var.file, base << 2, SEEK_SET); |
| 531 | gcov_var.start = ftell (gcov_var.file) >> 2; |
| 532 | } |
| 533 | #endif |
| 534 | |
| 535 | #if IN_GCOV > 0 |
| 536 | /* Return the modification time of the current gcov file. */ |
| 537 | |
| 538 | GCOV_LINKAGE time_t |
| 539 | gcov_time (void) |
| 540 | { |
| 541 | struct stat status; |
| 542 | |
| 543 | if (fstat (fileno (gcov_var.file), &status)) |
| 544 | return 0; |
| 545 | else |
| 546 | return status.st_mtime; |
| 547 | } |
| 548 | #endif /* IN_GCOV */ |