gcc/gcov-io.c

   1 /* File format for coverage information
   2    Copyright (C) 1996, 1997, 1998, 2000, 2002,
   3    2003  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 2, 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 You should have received a copy of the GNU General Public License
  20 along with GCC; see the file COPYING.  If not, write to the Free
  21 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
  22 02111-1307, USA.  */
  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 /* Open a gcov file. NAME is the name of the file to open and MODE
  28    indicates whether a new file should be created, or an existing file
  29    opened for modification. If MODE is >= 0 an existing file will be
  30    opened, if possible, and if MODE is <= 0, a new file will be
  31    created. Use MODE=0 to attempt to reopen an existing file and then
  32    fall back on creating a new one.  Return zero on failure, >0 on
  33    opening an existing file and <0 on creating a new one.  */
  34
  35 GCOV_LINKAGE int
  36 gcov_open (const char *name, int mode)
  37 {
  38   int result = 1;
  39   size_t alloc = 1024;
  40 #if defined (TARGET_HAS_F_SETLKW) && IN_LIBGCOV
  41   struct flock s_flock;
  42
  43   s_flock.l_type = F_WRLCK;
  44   s_flock.l_whence = SEEK_SET;
  45   s_flock.l_start = 0;
  46   s_flock.l_len = 0; /* Until EOF.  */
  47   s_flock.l_pid = getpid ();
  48 #endif
  49
  50   if (gcov_var.file)
  51     abort ();
  52   gcov_var.position = gcov_var.length = 0;
  53   gcov_var.error = gcov_var.modified = 0;
  54   if (mode >= 0)
  55     gcov_var.file = fopen (name, "r+b");
  56   if (!gcov_var.file && mode <= 0)
  57     {
  58       result = -1;
  59       gcov_var.file = fopen (name, "w+b");
  60     }
  61   if (!gcov_var.file)
  62     return 0;
  63
  64 #if defined (TARGET_HAS_F_SETLKW) && IN_LIBGCOV
  65   while (fcntl (fileno (gcov_var.file), F_SETLKW, &s_flock)
  66          && errno == EINTR)
  67     continue;
  68 #endif
  69
  70   if (result >= 0)
  71     {
  72       if (fseek (gcov_var.file, 0, SEEK_END))
  73         {
  74           fclose (gcov_var.file);
  75           gcov_var.file = 0;
  76           return 0;
  77         }
  78       gcov_var.length = ftell (gcov_var.file);
  79       fseek (gcov_var.file, 0, SEEK_SET);
  80       alloc += gcov_var.length;
  81     }
  82   if (alloc > gcov_var.alloc)
  83     {
  84       if (gcov_var.buffer)
  85         free (gcov_var.buffer);
  86       gcov_var.alloc = alloc;
  87 #if IN_LIBGCOV
  88       gcov_var.buffer = malloc (gcov_var.alloc);
  89       if (!gcov_var.buffer)
  90         {
  91           fclose (gcov_var.file);
  92           gcov_var.file = 0;
  93           gcov_var.length = 0;
  94           gcov_var.alloc = 0;
  95           return 0;
  96         }
  97 #else
  98       gcov_var.buffer = xmalloc (gcov_var.alloc);
  99 #endif
 100     }
 101   if (result >= 0
 102       && fread (gcov_var.buffer, gcov_var.length, 1, gcov_var.file) != 1)
 103     {
 104       fclose (gcov_var.file);
 105       gcov_var.file = 0;
 106       gcov_var.length = 0;
 107       return 0;
 108     }
 109   return result;
 110 }
 111
 112 /* Close the current gcov file. Flushes data to disk. Returns nonzero
 113    on failure or error flag set.  */
 114
 115 GCOV_LINKAGE int
 116 gcov_close ()
 117 {
 118   int result = 0;
 119
 120   if (gcov_var.file)
 121     {
 122       if (gcov_var.modified
 123           && (fseek (gcov_var.file, 0, SEEK_SET)
 124               || fwrite (gcov_var.buffer, gcov_var.length,
 125                          1, gcov_var.file) != 1))
 126         result = 1;
 127       fclose (gcov_var.file);
 128       gcov_var.file = 0;
 129       gcov_var.length = 0;
 130     }
 131 #if !IN_LIBGCOV
 132   free (gcov_var.buffer);
 133   gcov_var.alloc = 0;
 134   gcov_var.buffer = 0;
 135 #endif
 136   return result ? 1 : gcov_var.error;
 137 }
 138
 139 #if !IN_GCOV
 140 /* Allocate space to write BYTES bytes to the gcov file. Return a
 141    pointer to those bytes, or NULL on failure.  */
 142
 143 GCOV_LINKAGE unsigned char *
 144 gcov_write_bytes (unsigned bytes)
 145 {
 146   char unsigned *result;
 147
 148   if (gcov_var.position + bytes > gcov_var.alloc)
 149     {
 150       size_t new_size = (gcov_var.alloc + bytes) * 3 / 2;
 151
 152       if (!gcov_var.buffer)
 153         return 0;
 154 #if IN_LIBGCOV
 155       result = realloc (gcov_var.buffer, new_size);
 156       if (!result)
 157         {
 158           free (gcov_var.buffer);
 159           gcov_var.buffer = 0;
 160           gcov_var.alloc = 0;
 161           gcov_var.position = gcov_var.length = 0;
 162           gcov_var.error = 1;
 163           return 0;
 164         }
 165 #else
 166       result = xrealloc (gcov_var.buffer, new_size);
 167 #endif
 168       gcov_var.alloc = new_size;
 169       gcov_var.buffer = result;
 170     }
 171
 172   result = &gcov_var.buffer[gcov_var.position];
 173   gcov_var.position += bytes;
 174   gcov_var.modified = 1;
 175   if (gcov_var.position > gcov_var.length)
 176     gcov_var.length = gcov_var.position;
 177   return result;
 178 }
 179
 180 /* Write unsigned VALUE to coverage file.  Sets error flag
 181    appropriately.  */
 182
 183 GCOV_LINKAGE void
 184 gcov_write_unsigned (unsigned value)
 185 {
 186   unsigned char *buffer = gcov_write_bytes (4);
 187   unsigned ix;
 188
 189   if (!buffer)
 190     return;
 191   for (ix = 4; ix--; )
 192     {
 193       buffer[ix] = value;
 194       value >>= 8;
 195     }
 196   if (sizeof (value) > 4 && value)
 197     gcov_var.error = -1;
 198
 199   return;
 200 }
 201
 202 /* Write counter VALUE to coverage file.  Sets error flag
 203    appropriately.  */
 204
 205 #if IN_LIBGCOV
 206 GCOV_LINKAGE void
 207 gcov_write_counter (gcov_type value)
 208 {
 209   unsigned char *buffer = gcov_write_bytes (8);
 210   unsigned ix;
 211
 212   if (!buffer)
 213     return;
 214   for (ix = 8; ix--; )
 215     {
 216       buffer[ix] = value;
 217       value >>= 8;
 218     }
 219   if ((sizeof (value) > 8 && value) || value < 0)
 220     gcov_var.error = -1;
 221   return;
 222 }
 223 #endif /* IN_LIBGCOV */
 224
 225 #if !IN_LIBGCOV
 226 /* Write STRING to coverage file.  Sets error flag on file
 227    error, overflow flag on overflow */
 228
 229 GCOV_LINKAGE void
 230 gcov_write_string (const char *string)
 231 {
 232   unsigned length = 0;
 233   unsigned pad = 0;
 234   unsigned rem = 0;
 235   unsigned char *buffer;
 236
 237   if (string)
 238     {
 239       length = strlen (string);
 240       rem = 4 - (length & 3);
 241     }
 242
 243   buffer = gcov_write_bytes (4 + length + rem);
 244   if (buffer)
 245     {
 246       unsigned ix;
 247       unsigned value = length;
 248
 249       for (ix = 4; ix--; )
 250         {
 251           buffer[ix] = value;
 252           value >>= 8;
 253         }
 254       memcpy (buffer + 4, string, length);
 255       memcpy (buffer + 4 + length, &pad, rem);
 256     }
 257 }
 258 #endif
 259
 260 /* Write a tag TAG and reserve space for the record length. Return a
 261    value to be used for gcov_write_length.  */
 262
 263 GCOV_LINKAGE unsigned long
 264 gcov_write_tag (unsigned tag)
 265 {
 266   unsigned long result = gcov_var.position;
 267   unsigned char *buffer = gcov_write_bytes (8);
 268   unsigned ix;
 269
 270   if (!buffer)
 271     return 0;
 272   for (ix = 4; ix--; )
 273     {
 274       buffer[ix] = tag;
 275       tag >>= 8;
 276     }
 277   memset (buffer + 4, 0, 4);
 278   return result;
 279 }
 280
 281 /* Write a record length using POSITION, which was returned by
 282    gcov_write_tag.  The current file position is the end of the
 283    record, and is restored before returning.  Returns nonzero on
 284    overflow.  */
 285
 286 GCOV_LINKAGE void
 287 gcov_write_length (unsigned long position)
 288 {
 289   if (position)
 290     {
 291       unsigned length = gcov_var.position - position - 8;
 292       unsigned char *buffer = &gcov_var.buffer[position + 4];
 293       unsigned ix;
 294
 295       for (ix = 4; ix--; )
 296         {
 297           buffer[ix] = length;
 298           length >>= 8;
 299         }
 300     }
 301 }
 302
 303 #if IN_LIBGCOV
 304 /* Write a summary structure to the gcov file.  Return non-zero on
 305    overflow.  */
 306
 307 GCOV_LINKAGE void
 308 gcov_write_summary (unsigned tag, const struct gcov_summary *summary)
 309 {
 310   unsigned ix;
 311   const struct gcov_ctr_summary *csum;
 312   unsigned long base;
 313
 314   base = gcov_write_tag (tag);
 315   gcov_write_unsigned (summary->checksum);
 316   for (csum = summary->ctrs, ix = GCOV_COUNTERS; ix--; csum++)
 317     {
 318       gcov_write_unsigned (csum->num);
 319       gcov_write_unsigned (csum->runs);
 320       gcov_write_counter (csum->sum_all);
 321       gcov_write_counter (csum->run_max);
 322       gcov_write_counter (csum->sum_max);
 323     }
 324   gcov_write_length (base);
 325 }
 326 #endif /* IN_LIBGCOV */
 327
 328 #endif /*!IN_GCOV */
 329
 330 /* Return a pointer to read BYTES bytes from the gcov file. Returns
 331    NULL on failure (read past EOF). */
 332
 333 GCOV_LINKAGE const unsigned char *
 334 gcov_read_bytes (unsigned bytes)
 335 {
 336   const unsigned char *result;
 337
 338   if (gcov_var.position + bytes > gcov_var.length)
 339     {
 340       gcov_var.error = 1;
 341       return 0;
 342     }
 343
 344   result = &gcov_var.buffer[gcov_var.position];
 345   gcov_var.position += bytes;
 346   return result;
 347 }
 348
 349 /* Read unsigned value from a coverage file. Sets error flag on file
 350    error, overflow flag on overflow */
 351
 352 GCOV_LINKAGE unsigned
 353 gcov_read_unsigned ()
 354 {
 355   unsigned value = 0;
 356   unsigned ix;
 357   const unsigned char *buffer = gcov_read_bytes (4);
 358
 359   if (!buffer)
 360     return 0;
 361   for (ix = sizeof (value); ix < 4; ix++)
 362     if (buffer[ix])
 363       gcov_var.error = -1;
 364   for (ix = 0; ix != 4; ix++)
 365     {
 366       value <<= 8;
 367       value |= buffer[ix];
 368     }
 369   return value;
 370 }
 371
 372 /* Read counter value from a coverage file. Sets error flag on file
 373    error, overflow flag on overflow */
 374
 375 GCOV_LINKAGE gcov_type
 376 gcov_read_counter ()
 377 {
 378   gcov_type value = 0;
 379   unsigned ix;
 380   const unsigned char *buffer = gcov_read_bytes (8);
 381
 382   if (!buffer)
 383     return 0;
 384   for (ix = sizeof (value); ix < 8; ix++)
 385     if (buffer[ix])
 386       gcov_var.error = -1;
 387   for (ix = 0; ix != 8; ix++)
 388     {
 389       value <<= 8;
 390       value |= buffer[ix];
 391     }
 392   if (value < 0)
 393     gcov_var.error = -1;
 394   return value;
 395 }
 396
 397 /* Read string from coverage file. Returns a pointer to a static
 398    buffer, or NULL on empty string. You must copy the string before
 399    calling another gcov function.  */
 400
 401 #if !IN_LIBGCOV
 402 GCOV_LINKAGE const char *
 403 gcov_read_string ()
 404 {
 405   unsigned length = gcov_read_unsigned ();
 406
 407   if (!length)
 408     return 0;
 409
 410   length += 4 - (length & 3);
 411   return (const char *) gcov_read_bytes (length);
 412 }
 413 #endif
 414
 415 GCOV_LINKAGE void
 416 gcov_read_summary (struct gcov_summary *summary)
 417 {
 418   unsigned ix;
 419   struct gcov_ctr_summary *csum;
 420
 421   summary->checksum = gcov_read_unsigned ();
 422   for (csum = summary->ctrs, ix = GCOV_COUNTERS; ix--; csum++)
 423     {
 424       csum->num = gcov_read_unsigned ();
 425       csum->runs = gcov_read_unsigned ();
 426       csum->sum_all = gcov_read_counter ();
 427       csum->run_max = gcov_read_counter ();
 428       csum->sum_max = gcov_read_counter ();
 429     }
 430 }
 431
 432 #if IN_GCOV > 0
 433 /* Return the modification time of the current gcov file.  */
 434
 435 GCOV_LINKAGE time_t
 436 gcov_time ()
 437 {
 438   struct stat status;
 439
 440   if (fstat (fileno (gcov_var.file), &status))
 441     return 0;
 442   else
 443     return status.st_mtime;
 444 }
 445 #endif /* IN_GCOV */