libgcc/libgcov-driver.c

   1 /* Routines required for instrumenting a program.  */
   2 /* Compile this one with gcc.  */
   3 /* Copyright (C) 1989-2024 Free Software Foundation, Inc.
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify it under
   8 the terms of the GNU General Public License as published by the Free
   9 Software Foundation; either version 3, or (at your option) any later
  10 version.
  11
  12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 for more details.
  16
  17 Under Section 7 of GPL version 3, you are granted additional
  18 permissions described in the GCC Runtime Library Exception, version
  19 3.1, as published by the Free Software Foundation.
  20
  21 You should have received a copy of the GNU General Public License and
  22 a copy of the GCC Runtime Library Exception along with this program;
  23 see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  24 <http://www.gnu.org/licenses/>.  */
  25
  26 #include "libgcov.h"
  27 #include "gcov-io.h"
  28
  29 /* Return 1, if all counter values are zero, otherwise 0. */
  30
  31 static inline int
  32 are_all_counters_zero (const struct gcov_ctr_info *ci_ptr)
  33 {
  34   for (unsigned i = 0; i < ci_ptr->num; i++)
  35     if (ci_ptr->values[i] != 0)
  36       return 0;
  37
  38   return 1;
  39 }
  40
  41 #if defined(inhibit_libc)
  42 /* If libc and its header files are not available, provide dummy functions.  */
  43
  44 #if defined(L_gcov)
  45 void __gcov_init (struct gcov_info *p __attribute__ ((unused))) {}
  46 #endif
  47
  48 #else /* inhibit_libc */
  49
  50 #if GCOV_LOCKED
  51 #include <fcntl.h>
  52 #include <errno.h>
  53 #include <sys/stat.h>
  54 #elif GCOV_LOCKED_WITH_LOCKING
  55 #include <fcntl.h>
  56 #include <sys/locking.h>
  57 #include <sys/stat.h>
  58 #endif
  59
  60 #if HAVE_SYS_MMAN_H
  61 #include <sys/mman.h>
  62 #endif
  63
  64 #endif /* inhibit_libc */
  65
  66 #if defined(L_gcov) && !defined(inhibit_libc)
  67 #define NEED_L_GCOV
  68 #endif
  69
  70 #if defined(L_gcov_info_to_gcda) && !IN_GCOV_TOOL
  71 #define NEED_L_GCOV_INFO_TO_GCDA
  72 #endif
  73
  74 #ifdef NEED_L_GCOV
  75 /* A utility function for outputting errors.  */
  76 static int gcov_error (const char *, ...);
  77
  78 #if !IN_GCOV_TOOL
  79 static void gcov_error_exit (void);
  80 #endif
  81
  82 #include "gcov-io.cc"
  83
  84 #define GCOV_PROF_PREFIX "libgcov profiling error:%s:"
  85
  86 struct gcov_fn_buffer
  87 {
  88   struct gcov_fn_buffer *next;
  89   unsigned fn_ix;
  90   struct gcov_fn_info info;
  91   /* note gcov_fn_info ends in a trailing array.  */
  92 };
  93
  94 struct gcov_summary_buffer
  95 {
  96   struct gcov_summary_buffer *next;
  97   struct gcov_summary summary;
  98 };
  99
 100 /* A struct that bundles all the related information about the
 101    gcda filename.  */
 102
 103 struct gcov_filename
 104 {
 105   char *filename;  /* filename buffer */
 106   int strip; /* leading chars to strip from filename */
 107   char *prefix; /* prefix string */
 108 };
 109
 110 static struct gcov_fn_buffer *
 111 free_fn_data (const struct gcov_info *gi_ptr, struct gcov_fn_buffer *buffer,
 112               unsigned limit)
 113 {
 114   struct gcov_fn_buffer *next;
 115   unsigned ix, n_ctr = 0;
 116
 117   if (!buffer)
 118     return 0;
 119   next = buffer->next;
 120
 121   for (ix = 0; ix != limit; ix++)
 122     if (gi_ptr->merge[ix])
 123       free (buffer->info.ctrs[n_ctr++].values);
 124   free (buffer);
 125   return next;
 126 }
 127
 128 static struct gcov_fn_buffer **
 129 buffer_fn_data (const char *filename, const struct gcov_info *gi_ptr,
 130                 struct gcov_fn_buffer **end_ptr, unsigned fn_ix)
 131 {
 132   unsigned n_ctrs = 0, ix = 0;
 133   struct gcov_fn_buffer *fn_buffer;
 134   unsigned len;
 135
 136   for (ix = GCOV_COUNTERS; ix--;)
 137     if (gi_ptr->merge[ix])
 138       n_ctrs++;
 139
 140   len = sizeof (*fn_buffer) + sizeof (fn_buffer->info.ctrs[0]) * n_ctrs;
 141   fn_buffer = (struct gcov_fn_buffer *) xmalloc (len);
 142
 143   if (!fn_buffer)
 144     goto fail;
 145
 146   fn_buffer->next = 0;
 147   fn_buffer->fn_ix = fn_ix;
 148   fn_buffer->info.ident = gcov_read_unsigned ();
 149   fn_buffer->info.lineno_checksum = gcov_read_unsigned ();
 150   fn_buffer->info.cfg_checksum = gcov_read_unsigned ();
 151
 152   for (n_ctrs = ix = 0; ix != GCOV_COUNTERS; ix++)
 153     {
 154       gcov_unsigned_t length;
 155       gcov_type *values;
 156
 157       if (!gi_ptr->merge[ix])
 158         continue;
 159
 160       if (gcov_read_unsigned () != GCOV_TAG_FOR_COUNTER (ix))
 161         {
 162           len = 0;
 163           goto fail;
 164         }
 165
 166       length = GCOV_TAG_COUNTER_NUM (gcov_read_unsigned ());
 167       len = length * sizeof (gcov_type);
 168       values = (gcov_type *) xmalloc (len);
 169       if (!values)
 170         goto fail;
 171
 172       fn_buffer->info.ctrs[n_ctrs].num = length;
 173       fn_buffer->info.ctrs[n_ctrs].values = values;
 174
 175       while (length--)
 176         *values++ = gcov_read_counter ();
 177       n_ctrs++;
 178     }
 179
 180   *end_ptr = fn_buffer;
 181   return &fn_buffer->next;
 182
 183 fail:
 184   gcov_error (GCOV_PROF_PREFIX "Function %u %s %u \n", filename, fn_ix,
 185               len ? "cannot allocate" : "counter mismatch", len ? len : ix);
 186
 187   return (struct gcov_fn_buffer **)free_fn_data (gi_ptr, fn_buffer, ix);
 188 }
 189
 190 /* Convert VERSION into a string description and return the it.
 191    BUFFER is used for storage of the string.  The code should be
 192    aligned wit gcov-iov.c.  */
 193
 194 static char *
 195 gcov_version_string (char *buffer, char version[4])
 196 {
 197   if (version[0] < 'A' || version[0] > 'Z'
 198       || version[1] < '0' || version[1] > '9'
 199       || version[2] < '0' || version[2] > '9')
 200     sprintf (buffer, "(unknown)");
 201   else
 202     {
 203       unsigned major = 10 * (version[0] - 'A') + (version[1] - '0');
 204       unsigned minor = version[2] - '0';
 205       sprintf (buffer, "%u.%u (%s)", major, minor,
 206                version[3] == '*' ? "release" : "experimental");
 207     }
 208   return buffer;
 209 }
 210
 211 /* Check if VERSION of the info block PTR matches libgcov one.
 212    Return 1 on success, or zero in case of versions mismatch.
 213    If FILENAME is not NULL, its value used for reporting purposes
 214    instead of value from the info block.  */
 215
 216 static int
 217 gcov_version (struct gcov_info *ptr, gcov_unsigned_t version,
 218               const char *filename)
 219 {
 220   if (version != GCOV_VERSION)
 221     {
 222       char v[4], e[4];
 223       char ver_string[128], expected_string[128];
 224
 225       GCOV_UNSIGNED2STRING (v, version);
 226       GCOV_UNSIGNED2STRING (e, GCOV_VERSION);
 227
 228       gcov_error (GCOV_PROF_PREFIX "Version mismatch - expected %s (%.4s) "
 229                   "got %s (%.4s)\n",
 230                   filename? filename : ptr->filename,
 231                   gcov_version_string (expected_string, e), e,
 232                   gcov_version_string (ver_string, v), v);
 233       return 0;
 234     }
 235   return 1;
 236 }
 237
 238 /* buffer for the fn_data from another program.  */
 239 static struct gcov_fn_buffer *fn_buffer;
 240
 241 /* Including system dependent components. */
 242 #include "libgcov-driver-system.c"
 243
 244 /* This function merges counters in GI_PTR to an existing gcda file.
 245    Return 0 on success.
 246    Return -1 on error. In this case, caller will goto read_fatal.  */
 247
 248 static int
 249 merge_one_data (const char *filename,
 250                 struct gcov_info *gi_ptr,
 251                 struct gcov_summary *summary)
 252 {
 253   gcov_unsigned_t tag, length;
 254   unsigned t_ix;
 255   int f_ix = -1;
 256   int error = 0;
 257   struct gcov_fn_buffer **fn_tail = &fn_buffer;
 258
 259   length = gcov_read_unsigned ();
 260   if (!gcov_version (gi_ptr, length, filename))
 261     return -1;
 262
 263   /* Skip timestamp.  */
 264   gcov_read_unsigned ();
 265
 266   length = gcov_read_unsigned ();
 267   if (length != gi_ptr->checksum)
 268     {
 269       /* Read from a different compilation.  Overwrite the file.  */
 270       gcov_error (GCOV_PROF_PREFIX "overwriting an existing profile data "
 271                   "with a different checksum\n", filename);
 272       return 0;
 273     }
 274
 275   tag = gcov_read_unsigned ();
 276   if (tag != GCOV_TAG_OBJECT_SUMMARY)
 277     goto read_mismatch;
 278   length = gcov_read_unsigned ();
 279   gcc_assert (length > 0);
 280   gcov_read_summary (summary);
 281
 282   tag = gcov_read_unsigned ();
 283   /* Merge execution counts for each function.  */
 284   for (f_ix = 0; (unsigned)f_ix != gi_ptr->n_functions;
 285        f_ix++, tag = gcov_read_unsigned ())
 286     {
 287       const struct gcov_ctr_info *ci_ptr;
 288       const struct gcov_fn_info *gfi_ptr = gi_ptr->functions[f_ix];
 289
 290       if (tag != GCOV_TAG_FUNCTION)
 291         goto read_mismatch;
 292
 293       length = gcov_read_unsigned ();
 294       if (!length)
 295         /* This function did not appear in the other program.
 296            We have nothing to merge.  */
 297         continue;
 298
 299       if (length != GCOV_TAG_FUNCTION_LENGTH)
 300         goto read_mismatch;
 301
 302       if (!gfi_ptr || gfi_ptr->key != gi_ptr)
 303         {
 304           /* This function appears in the other program.  We
 305              need to buffer the information in order to write
 306              it back out -- we'll be inserting data before
 307              this point, so cannot simply keep the data in the
 308              file.  */
 309           fn_tail = buffer_fn_data (filename, gi_ptr, fn_tail, f_ix);
 310           if (!fn_tail)
 311             goto read_mismatch;
 312           continue;
 313         }
 314
 315       length = gcov_read_unsigned ();
 316       if (length != gfi_ptr->ident)
 317         goto read_mismatch;
 318
 319       length = gcov_read_unsigned ();
 320       if (length != gfi_ptr->lineno_checksum)
 321         goto read_mismatch;
 322
 323       length = gcov_read_unsigned ();
 324       if (length != gfi_ptr->cfg_checksum)
 325         goto read_mismatch;
 326
 327       ci_ptr = gfi_ptr->ctrs;
 328       for (t_ix = 0; t_ix < GCOV_COUNTERS; t_ix++)
 329         {
 330           gcov_merge_fn merge = gi_ptr->merge[t_ix];
 331
 332           if (!merge)
 333             continue;
 334
 335           tag = gcov_read_unsigned ();
 336           int read_length = (int)gcov_read_unsigned ();
 337           length = abs (read_length);
 338           if (tag != GCOV_TAG_FOR_COUNTER (t_ix)
 339               || (length != GCOV_TAG_COUNTER_LENGTH (ci_ptr->num)
 340                   && t_ix != GCOV_COUNTER_V_TOPN
 341                   && t_ix != GCOV_COUNTER_V_INDIR))
 342             goto read_mismatch;
 343           /* Merging with all zero counters does not make sense.  */
 344           if (read_length > 0)
 345             (*merge) (ci_ptr->values, ci_ptr->num);
 346           ci_ptr++;
 347         }
 348       if ((error = gcov_is_error ()))
 349         goto read_error;
 350     }
 351
 352   if (tag)
 353     {
 354     read_mismatch:;
 355       gcov_error (GCOV_PROF_PREFIX "Merge mismatch for %s %u\n",
 356                   filename, f_ix >= 0 ? "function" : "summary",
 357                   f_ix < 0 ? -1 - f_ix : f_ix);
 358       return -1;
 359     }
 360   return 0;
 361
 362 read_error:
 363   gcov_error (GCOV_PROF_PREFIX "%s merging\n", filename,
 364               error < 0 ? "Overflow": "Error");
 365   return -1;
 366 }
 367
 368 /* Write the DATA of LENGTH characters to the gcov file.  */
 369
 370 static void
 371 gcov_dump_handler (const void *data,
 372                    unsigned length,
 373                    void *arg ATTRIBUTE_UNUSED)
 374 {
 375   gcov_write (data, length);
 376 }
 377
 378 /* Allocate SIZE characters and return the address of the allocated memory.  */
 379
 380 static void *
 381 gcov_allocate_handler (unsigned size, void *arg ATTRIBUTE_UNUSED)
 382 {
 383   return xmalloc (size);
 384 }
 385 #endif /* NEED_L_GCOV */
 386
 387 #if defined(NEED_L_GCOV) || defined(NEED_L_GCOV_INFO_TO_GCDA)
 388 /* Dump the WORD using the DUMP handler called with ARG.  */
 389
 390 static inline void
 391 dump_unsigned (gcov_unsigned_t word,
 392                void (*dump_fn) (const void *, unsigned, void *),
 393                void *arg)
 394 {
 395   (*dump_fn) (&word, sizeof (word), arg);
 396 }
 397
 398 /* Dump the COUNTER using the DUMP handler called with ARG.  */
 399
 400 static inline void
 401 dump_counter (gcov_type counter,
 402               void (*dump_fn) (const void *, unsigned, void *),
 403               void *arg)
 404 {
 405   dump_unsigned ((gcov_unsigned_t)counter, dump_fn, arg);
 406
 407   if (sizeof (counter) > sizeof (gcov_unsigned_t))
 408     dump_unsigned ((gcov_unsigned_t)(counter >> 32), dump_fn, arg);
 409   else
 410     dump_unsigned (0, dump_fn, arg);
 411 }
 412
 413 /* Dump the STRING using the DUMP handler called with ARG.  */
 414
 415 static inline void
 416 ATTRIBUTE_UNUSED
 417 dump_string (const char *string,
 418              void (*dump_fn) (const void *, unsigned, void *),
 419              void *arg)
 420 {
 421   unsigned length = 0;
 422
 423   if (string)
 424     length = strlen (string) + 1;
 425
 426   dump_unsigned (length, dump_fn, arg);
 427   if (string)
 428     (*dump_fn) (string, length, arg);
 429 }
 430
 431 #define MAX(X,Y) ((X) > (Y) ? (X) : (Y))
 432
 433 /* Store all TOP N counters where each has a dynamic length.  */
 434
 435 static void
 436 write_topn_counters (const struct gcov_ctr_info *ci_ptr,
 437                      unsigned t_ix,
 438                      gcov_unsigned_t n_counts,
 439                      void (*dump_fn) (const void *, unsigned, void *),
 440                      void *(*allocate_fn)(unsigned, void *),
 441                      void *arg)
 442 {
 443   unsigned counters = n_counts / GCOV_TOPN_MEM_COUNTERS;
 444   gcc_assert (n_counts % GCOV_TOPN_MEM_COUNTERS == 0);
 445
 446   /* It can happen in a multi-threaded environment that number of counters is
 447      different from the size of the corresponding linked lists.  */
 448 #define LIST_SIZE_MIN_LENGTH 4 * 1024
 449
 450   static unsigned *list_sizes = NULL;
 451   static unsigned list_size_length = 0;
 452
 453   if (list_sizes == NULL || counters > list_size_length)
 454     {
 455       list_size_length = MAX (LIST_SIZE_MIN_LENGTH, 2 * counters);
 456 #if !defined(inhibit_libc) && HAVE_SYS_MMAN_H
 457       list_sizes
 458         = (unsigned *)malloc_mmap (list_size_length * sizeof (unsigned));
 459 #endif
 460
 461       /* Malloc fallback.  */
 462       if (list_sizes == NULL)
 463         list_sizes =
 464           (unsigned *)(*allocate_fn) (list_size_length * sizeof (unsigned),
 465                                       arg);
 466     }
 467
 468   unsigned pair_total = 0;
 469
 470   for (unsigned i = 0; i < counters; i++)
 471     {
 472       gcov_type start = ci_ptr->values[GCOV_TOPN_MEM_COUNTERS * i + 2];
 473       unsigned sizes = 0;
 474
 475       for (struct gcov_kvp *node = (struct gcov_kvp *)(__INTPTR_TYPE__)start;
 476            node != NULL; node = node->next)
 477         ++sizes;
 478
 479       pair_total += sizes;
 480       list_sizes[i] = sizes;
 481     }
 482
 483   unsigned disk_size = GCOV_TOPN_DISK_COUNTERS * counters + 2 * pair_total;
 484   dump_unsigned (GCOV_TAG_FOR_COUNTER (t_ix), dump_fn, arg),
 485   dump_unsigned (GCOV_TAG_COUNTER_LENGTH (disk_size), dump_fn, arg);
 486
 487   for (unsigned i = 0; i < counters; i++)
 488     {
 489       dump_counter (ci_ptr->values[GCOV_TOPN_MEM_COUNTERS * i], dump_fn, arg);
 490       dump_counter (list_sizes[i], dump_fn, arg);
 491       gcov_type start = ci_ptr->values[GCOV_TOPN_MEM_COUNTERS * i + 2];
 492
 493       unsigned j = 0;
 494       for (struct gcov_kvp *node = (struct gcov_kvp *)(__INTPTR_TYPE__)start;
 495            j < list_sizes[i]; node = node->next, j++)
 496         {
 497           dump_counter (node->value, dump_fn, arg);
 498           dump_counter (node->count, dump_fn, arg);
 499         }
 500     }
 501 }
 502
 503 /* Write counters in GI_PTR and the summary in PRG to a gcda file. In
 504    the case of appending to an existing file, SUMMARY_POS will be non-zero.
 505    We will write the file starting from SUMMAY_POS.  */
 506
 507 static void
 508 write_one_data (const struct gcov_info *gi_ptr,
 509                 const struct gcov_summary *prg_p ATTRIBUTE_UNUSED,
 510                 void (*dump_fn) (const void *, unsigned, void *),
 511                 void *(*allocate_fn) (unsigned, void *),
 512                 void *arg)
 513 {
 514   unsigned f_ix;
 515
 516   dump_unsigned (GCOV_DATA_MAGIC, dump_fn, arg);
 517   dump_unsigned (GCOV_VERSION, dump_fn, arg);
 518   dump_unsigned (gi_ptr->stamp, dump_fn, arg);
 519   dump_unsigned (gi_ptr->checksum, dump_fn, arg);
 520
 521 #ifdef NEED_L_GCOV
 522   /* Generate whole program statistics.  */
 523   gcov_write_object_summary (prg_p);
 524 #endif
 525
 526   /* Write execution counts for each function.  */
 527   for (f_ix = 0; f_ix != gi_ptr->n_functions; f_ix++)
 528     {
 529 #ifdef NEED_L_GCOV
 530       unsigned buffered = 0;
 531 #endif
 532       const struct gcov_fn_info *gfi_ptr;
 533       const struct gcov_ctr_info *ci_ptr;
 534       gcov_unsigned_t length;
 535       unsigned t_ix;
 536
 537 #ifdef NEED_L_GCOV
 538       if (fn_buffer && fn_buffer->fn_ix == f_ix)
 539         {
 540           /* Buffered data from another program.  */
 541           buffered = 1;
 542           gfi_ptr = &fn_buffer->info;
 543           length = GCOV_TAG_FUNCTION_LENGTH;
 544         }
 545       else
 546 #endif
 547         {
 548           gfi_ptr = gi_ptr->functions[f_ix];
 549           if (gfi_ptr && gfi_ptr->key == gi_ptr)
 550             length = GCOV_TAG_FUNCTION_LENGTH;
 551           else
 552                 length = 0;
 553         }
 554
 555       dump_unsigned (GCOV_TAG_FUNCTION, dump_fn, arg);
 556       dump_unsigned (length, dump_fn, arg);
 557       if (!length)
 558         continue;
 559
 560       dump_unsigned (gfi_ptr->ident, dump_fn, arg);
 561       dump_unsigned (gfi_ptr->lineno_checksum, dump_fn, arg);
 562       dump_unsigned (gfi_ptr->cfg_checksum, dump_fn, arg);
 563
 564       ci_ptr = gfi_ptr->ctrs;
 565       for (t_ix = 0; t_ix < GCOV_COUNTERS; t_ix++)
 566         {
 567           gcov_position_t n_counts;
 568
 569           if (!gi_ptr->merge[t_ix])
 570             continue;
 571
 572           n_counts = ci_ptr->num;
 573
 574           if (t_ix == GCOV_COUNTER_V_TOPN || t_ix == GCOV_COUNTER_V_INDIR)
 575             write_topn_counters (ci_ptr, t_ix, n_counts, dump_fn, allocate_fn,
 576                                  arg);
 577           else
 578             {
 579               dump_unsigned (GCOV_TAG_FOR_COUNTER (t_ix), dump_fn, arg);
 580               if (are_all_counters_zero (ci_ptr))
 581                 /* Do not stream when all counters are zero.  */
 582                 dump_unsigned (GCOV_TAG_COUNTER_LENGTH (-n_counts),
 583                                dump_fn, arg);
 584               else
 585                 {
 586                   dump_unsigned (GCOV_TAG_COUNTER_LENGTH (n_counts),
 587                                  dump_fn, arg);
 588                   for (unsigned i = 0; i < n_counts; i++)
 589                     dump_counter (ci_ptr->values[i], dump_fn, arg);
 590                 }
 591             }
 592
 593           ci_ptr++;
 594         }
 595 #ifdef NEED_L_GCOV
 596       if (buffered)
 597         fn_buffer = free_fn_data (gi_ptr, fn_buffer, GCOV_COUNTERS);
 598 #endif
 599     }
 600
 601   dump_unsigned (0, dump_fn, arg);
 602 }
 603 #endif /* NEED_L_GCOV || NEED_L_GCOV_INFO_TO_GCDA */
 604
 605 #ifdef NEED_L_GCOV
 606 /* Dump the coverage counts for one gcov_info object. We merge with existing
 607    counts when possible, to avoid growing the .da files ad infinitum. We use
 608    this program's checksum to make sure we only accumulate whole program
 609    statistics to the correct summary. An object file might be embedded
 610    in two separate programs, and we must keep the two program
 611    summaries separate.  */
 612
 613 static void
 614 dump_one_gcov (struct gcov_info *gi_ptr, struct gcov_filename *gf,
 615                unsigned run_counted ATTRIBUTE_UNUSED,
 616                gcov_type run_max ATTRIBUTE_UNUSED, int mode)
 617 {
 618   struct gcov_summary summary = {};
 619   int error;
 620   gcov_unsigned_t tag;
 621   fn_buffer = 0;
 622
 623   error = gcov_exit_open_gcda_file (gi_ptr, gf, mode);
 624   if (error == -1)
 625     return;
 626
 627   tag = gcov_read_unsigned ();
 628   if (tag)
 629     {
 630       /* Merge data from file.  */
 631       if (tag != GCOV_DATA_MAGIC)
 632         {
 633           gcov_error (GCOV_PROF_PREFIX "Not a gcov data file\n",
 634                       gf->filename);
 635           goto read_fatal;
 636         }
 637       error = merge_one_data (gf->filename, gi_ptr, &summary);
 638       if (error == -1)
 639         goto read_fatal;
 640     }
 641
 642   gcov_rewrite ();
 643
 644 #if !IN_GCOV_TOOL
 645   if (!run_counted)
 646     {
 647       summary.runs++;
 648       summary.sum_max += run_max;
 649     }
 650 #else
 651   summary = gi_ptr->summary;
 652 #endif
 653
 654   write_one_data (gi_ptr, &summary, gcov_dump_handler, gcov_allocate_handler,
 655                   NULL);
 656   /* fall through */
 657
 658 read_fatal:;
 659   while (fn_buffer)
 660     fn_buffer = free_fn_data (gi_ptr, fn_buffer, GCOV_COUNTERS);
 661
 662   if ((error = gcov_close ()))
 663     gcov_error ((error < 0 ? GCOV_PROF_PREFIX "Overflow writing\n"
 664                  : GCOV_PROF_PREFIX "Error writing\n"), gf->filename);
 665 }
 666
 667
 668 /* Dump all the coverage counts for the program. It first computes program
 669    summary and then traverses gcov_list list and dumps the gcov_info
 670    objects one by one.  Use MODE to open files.  */
 671
 672 #if !IN_GCOV_TOOL
 673 static
 674 #endif
 675 void
 676 gcov_do_dump (struct gcov_info *list, int run_counted, int mode)
 677 {
 678   struct gcov_info *gi_ptr;
 679   struct gcov_filename gf;
 680
 681   /* Compute run_max of this program run.  */
 682   gcov_type run_max = 0;
 683   for (gi_ptr = list; gi_ptr; gi_ptr = gi_ptr->next)
 684     for (unsigned f_ix = 0; (unsigned)f_ix != gi_ptr->n_functions; f_ix++)
 685       {
 686         const struct gcov_ctr_info *cinfo
 687           = &gi_ptr->functions[f_ix]->ctrs[GCOV_COUNTER_ARCS];
 688
 689         for (unsigned i = 0; i < cinfo->num; i++)
 690           if (run_max < cinfo->values[i])
 691             run_max = cinfo->values[i];
 692       }
 693
 694   allocate_filename_struct (&gf);
 695
 696   /* Now merge each file.  */
 697   for (gi_ptr = list; gi_ptr; gi_ptr = gi_ptr->next)
 698     {
 699       dump_one_gcov (gi_ptr, &gf, run_counted, run_max, mode);
 700       free (gf.filename);
 701     }
 702
 703   free (gf.prefix);
 704 }
 705
 706 #if IN_GCOV_TOOL
 707 const char *
 708 __attribute__ ((unused))
 709 gcov_get_filename (struct gcov_info *list)
 710 {
 711   return list->filename;
 712 }
 713 #endif
 714
 715 #if !IN_GCOV_TOOL
 716 void
 717 __gcov_dump_one (struct gcov_root *root)
 718 {
 719   if (root->dumped)
 720     return;
 721
 722   gcov_do_dump (root->list, root->run_counted, 0);
 723
 724   root->dumped = 1;
 725   root->run_counted = 1;
 726 }
 727
 728 /* Per-dynamic-object gcov state.  */
 729 struct gcov_root __gcov_root;
 730
 731 /* Exactly one of these will be live in the process image.  */
 732 struct gcov_master __gcov_master =
 733   {GCOV_VERSION, 0};
 734
 735 /* Dynamic pool for gcov_kvp structures.  */
 736 struct gcov_kvp *__gcov_kvp_dynamic_pool;
 737
 738 /* Index into __gcov_kvp_dynamic_pool array.  */
 739 unsigned __gcov_kvp_dynamic_pool_index;
 740
 741 /* Size of _gcov_kvp_dynamic_pool array.  */
 742 unsigned __gcov_kvp_dynamic_pool_size;
 743
 744 void
 745 __gcov_exit (void)
 746 {
 747   __gcov_dump_one (&__gcov_root);
 748   if (__gcov_root.next)
 749     __gcov_root.next->prev = __gcov_root.prev;
 750   if (__gcov_root.prev)
 751     __gcov_root.prev->next = __gcov_root.next;
 752   else
 753     __gcov_master.root = __gcov_root.next;
 754
 755   gcov_error_exit ();
 756 }
 757
 758 /* Add a new object file onto the bb chain.  Invoked automatically
 759   when running an object file's global ctors.  */
 760
 761 void
 762 __gcov_init (struct gcov_info *info)
 763 {
 764   if (!info->version || !info->n_functions)
 765     return;
 766   if (gcov_version (info, info->version, 0))
 767     {
 768       if (!__gcov_root.list)
 769         {
 770           /* Add to master list and at exit function.  */
 771           if (gcov_version (NULL, __gcov_master.version, "<master>"))
 772             {
 773               __gcov_root.next = __gcov_master.root;
 774               if (__gcov_master.root)
 775                 __gcov_master.root->prev = &__gcov_root;
 776               __gcov_master.root = &__gcov_root;
 777             }
 778         }
 779
 780       info->next = __gcov_root.list;
 781       __gcov_root.list = info;
 782     }
 783 }
 784 #endif /* !IN_GCOV_TOOL */
 785 #endif /* NEED_L_GCOV */
 786
 787 #ifdef NEED_L_GCOV_INFO_TO_GCDA
 788 /* Convert the gcov info to a gcda data stream.  It is intended for
 789    freestanding environments which do not support the C library file I/O.  */
 790
 791 void
 792 __gcov_info_to_gcda (const struct gcov_info *gi_ptr,
 793                      void (*filename_fn) (const char *, void *),
 794                      void (*dump_fn) (const void *, unsigned, void *),
 795                      void *(*allocate_fn) (unsigned, void *),
 796                      void *arg)
 797 {
 798   (*filename_fn) (gi_ptr->filename, arg);
 799   write_one_data (gi_ptr, NULL, dump_fn, allocate_fn, arg);
 800 }
 801
 802 /* Convert the filename to a gcfn data stream.  It is intended for
 803    freestanding environments which do not support the C library file I/O.  */
 804
 805 void
 806 __gcov_filename_to_gcfn (const char *filename,
 807                          void (*dump_fn) (const void *, unsigned, void *),
 808                          void *arg)
 809 {
 810   dump_unsigned (GCOV_FILENAME_MAGIC, dump_fn, arg);
 811   dump_unsigned (GCOV_VERSION, dump_fn, arg);
 812   dump_string (filename, dump_fn, arg);
 813 }
 814 #endif /* NEED_L_GCOV_INFO_TO_GCDA */