gcc/coverage.c

   1 /* Read and write coverage files, and associated functionality.
   2    Copyright (C) 1990, 1991, 1992, 1993, 1994, 1996, 1997, 1998, 1999,
   3    2000, 2001, 2003  Free Software Foundation, Inc.
   4    Contributed by James E. Wilson, UC Berkeley/Cygnus Support;
   5    based on some ideas from Dain Samples of UC Berkeley.
   6    Further mangling by Bob Manson, Cygnus Support.
   7    Further mangled by Nathan Sidwell, CodeSourcery
   8
   9 This file is part of GCC.
  10
  11 GCC is free software; you can redistribute it and/or modify it under
  12 the terms of the GNU General Public License as published by the Free
  13 Software Foundation; either version 2, or (at your option) any later
  14 version.
  15
  16 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  17 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  18 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  19 for more details.
  20
  21 You should have received a copy of the GNU General Public License
  22 along with GCC; see the file COPYING.  If not, write to the Free
  23 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
  24 02111-1307, USA.  */
  25
  26
  27 #define GCOV_LINKAGE
  28
  29 #include "config.h"
  30 #include "system.h"
  31 #include "coretypes.h"
  32 #include "tm.h"
  33 #include "rtl.h"
  34 #include "tree.h"
  35 #include "flags.h"
  36 #include "output.h"
  37 #include "regs.h"
  38 #include "expr.h"
  39 #include "function.h"
  40 #include "toplev.h"
  41 #include "ggc.h"
  42 #include "target.h"
  43 #include "coverage.h"
  44 #include "libfuncs.h"
  45 #include "langhooks.h"
  46 #include "hashtab.h"
  47
  48 #include "gcov-io.c"
  49
  50 struct function_list
  51 {
  52   struct function_list *next;    /* next function */
  53   unsigned ident;                /* function ident */
  54   unsigned checksum;             /* function checksum */
  55   unsigned n_ctrs[GCOV_COUNTERS];/* number of counters.  */
  56 };
  57
  58 /* Counts information for a function.  */
  59 typedef struct counts_entry
  60 {
  61   /* We hash by  */
  62   unsigned ident;
  63   unsigned ctr;
  64
  65   /* Store  */
  66   unsigned checksum;
  67   gcov_type *counts;
  68   struct gcov_ctr_summary summary;
  69
  70   /* Workspace */
  71   struct counts_entry *chain;
  72
  73 } counts_entry_t;
  74
  75 static struct function_list *functions_head = 0;
  76 static struct function_list **functions_tail = &functions_head;
  77 static unsigned no_coverage = 0;
  78
  79 /* Cumulative counter information for whole program.  */
  80 static unsigned prg_ctr_mask; /* Mask of counter types generated.  */
  81 static unsigned prg_n_ctrs[GCOV_COUNTERS]; /* Total counters allocated.  */
  82
  83 /* Counter information for current function.  */
  84 static unsigned fn_ctr_mask; /* Mask of counters used.  */
  85 static unsigned fn_n_ctrs[GCOV_COUNTERS]; /* Counters allocated.  */
  86 static unsigned fn_b_ctrs[GCOV_COUNTERS]; /* Allocation base.  */
  87
  88 /* Name of the output file for coverage output file.  */
  89 static char *bbg_file_name;
  90 static unsigned bbg_file_opened;
  91 static int bbg_function_announced;
  92
  93 /* Name of the count data file.  */
  94 static char *da_file_name;
  95
  96 /* Hash table of count data.  */
  97 static htab_t counts_hash = NULL;
  98
  99 /* The names of the counter tables.  */
 100 static GTY(()) rtx ctr_labels[GCOV_COUNTERS];
 101
 102 /* The names of merge functions for counters.  */
 103 static const char *const ctr_merge_functions[GCOV_COUNTERS] = GCOV_MERGE_FUNCTIONS;
 104 static const char *const ctr_names[GCOV_COUNTERS] = GCOV_COUNTER_NAMES;
 105
 106 /* Forward declarations.  */
 107 static hashval_t htab_counts_entry_hash (const void *);
 108 static int htab_counts_entry_eq (const void *, const void *);
 109 static void htab_counts_entry_del (void *);
 110 static void read_counts_file (void);
 111 static unsigned compute_checksum (void);
 112 static unsigned checksum_string (unsigned, const char *);
 113 static tree build_fn_info_type (unsigned);
 114 static tree build_fn_info_value (const struct function_list *, tree);
 115 static tree build_ctr_info_type (void);
 116 static tree build_ctr_info_value (unsigned, tree);
 117 static tree build_gcov_info (void);
 118 static void create_coverage (void);
 119
 120 \f
 121 static hashval_t
 122 htab_counts_entry_hash (const void *of)
 123 {
 124   const counts_entry_t *entry = of;
 125
 126   return entry->ident * GCOV_COUNTERS + entry->ctr;
 127 }
 128
 129 static int
 130 htab_counts_entry_eq (const void *of1, const void *of2)
 131 {
 132   const counts_entry_t *entry1 = of1;
 133   const counts_entry_t *entry2 = of2;
 134
 135   return entry1->ident == entry2->ident && entry1->ctr == entry2->ctr;
 136 }
 137
 138 static void
 139 htab_counts_entry_del (void *of)
 140 {
 141   counts_entry_t *entry = of;
 142
 143   free (entry->counts);
 144   free (entry);
 145 }
 146
 147 /* Read in the counts file, if available.  */
 148
 149 static void
 150 read_counts_file (void)
 151 {
 152   gcov_unsigned_t fn_ident = 0;
 153   gcov_unsigned_t checksum = -1;
 154   counts_entry_t *summaried = NULL;
 155   unsigned seen_summary = 0;
 156   gcov_unsigned_t tag;
 157   int error = 0;
 158
 159   if (!gcov_open (da_file_name, 1))
 160     return;
 161
 162   if (!gcov_magic (gcov_read_unsigned (), GCOV_DATA_MAGIC))
 163     {
 164       warning ("`%s' is not a gcov data file", da_file_name);
 165       gcov_close ();
 166       return;
 167     }
 168   else if ((tag = gcov_read_unsigned ()) != GCOV_VERSION)
 169     {
 170       char v[4], e[4];
 171
 172       GCOV_UNSIGNED2STRING (v, tag);
 173       GCOV_UNSIGNED2STRING (e, GCOV_VERSION);
 174
 175       warning ("`%s' is version `%.4s', expected version `%.4s'",
 176                da_file_name, v, e);
 177       gcov_close ();
 178       return;
 179     }
 180
 181   /* Read and discard the stamp.  */
 182   gcov_read_unsigned ();
 183
 184   counts_hash = htab_create (10,
 185                              htab_counts_entry_hash, htab_counts_entry_eq,
 186                              htab_counts_entry_del);
 187   while ((tag = gcov_read_unsigned ()))
 188     {
 189       gcov_unsigned_t length;
 190       gcov_position_t offset;
 191
 192       length = gcov_read_unsigned ();
 193       offset = gcov_position ();
 194       if (tag == GCOV_TAG_FUNCTION)
 195         {
 196           fn_ident = gcov_read_unsigned ();
 197           checksum = gcov_read_unsigned ();
 198           if (seen_summary)
 199             {
 200               /* We have already seen a summary, this means that this
 201                  new function begins a new set of program runs. We
 202                  must unlink the summaried chain.  */
 203               counts_entry_t *entry, *chain;
 204
 205               for (entry = summaried; entry; entry = chain)
 206                 {
 207                   chain = entry->chain;
 208                   entry->chain = NULL;
 209                 }
 210               summaried = NULL;
 211               seen_summary = 0;
 212             }
 213         }
 214       else if (tag == GCOV_TAG_PROGRAM_SUMMARY)
 215         {
 216           counts_entry_t *entry;
 217           struct gcov_summary summary;
 218
 219           gcov_read_summary (&summary);
 220           seen_summary = 1;
 221           for (entry = summaried; entry; entry = entry->chain)
 222             {
 223               struct gcov_ctr_summary *csum = &summary.ctrs[entry->ctr];
 224
 225               entry->summary.runs += csum->runs;
 226               entry->summary.sum_all += csum->sum_all;
 227               if (entry->summary.run_max < csum->run_max)
 228                 entry->summary.run_max = csum->run_max;
 229               entry->summary.sum_max += csum->sum_max;
 230             }
 231         }
 232       else if (GCOV_TAG_IS_COUNTER (tag) && fn_ident)
 233         {
 234           counts_entry_t **slot, *entry, elt;
 235           unsigned n_counts = GCOV_TAG_COUNTER_NUM (length);
 236           unsigned ix;
 237
 238           elt.ident = fn_ident;
 239           elt.ctr = GCOV_COUNTER_FOR_TAG (tag);
 240
 241           slot = (counts_entry_t **) htab_find_slot
 242             (counts_hash, &elt, INSERT);
 243           entry = *slot;
 244           if (!entry)
 245             {
 246               *slot = entry = xcalloc (1, sizeof (counts_entry_t));
 247               entry->ident = elt.ident;
 248               entry->ctr = elt.ctr;
 249               entry->checksum = checksum;
 250               entry->summary.num = n_counts;
 251               entry->counts = xcalloc (n_counts, sizeof (gcov_type));
 252             }
 253           else if (entry->checksum != checksum
 254                    || entry->summary.num != n_counts)
 255             {
 256               warning ("coverage mismatch for function %u", fn_ident);
 257               htab_delete (counts_hash);
 258               break;
 259             }
 260           else if (elt.ctr >= GCOV_COUNTERS_SUMMABLE)
 261             {
 262               warning ("cannot merge separate %s counters for function %u",
 263                        ctr_names[elt.ctr], fn_ident);
 264               goto skip_merge;
 265             }
 266
 267           if (elt.ctr < GCOV_COUNTERS_SUMMABLE
 268               /* This should always be true for a just allocated entry,
 269                  and always false for an existing one. Check this way, in
 270                  case the gcov file is corrupt.  */
 271               && (!entry->chain || summaried != entry))
 272             {
 273               entry->chain = summaried;
 274               summaried = entry;
 275             }
 276           for (ix = 0; ix != n_counts; ix++)
 277             entry->counts[ix] += gcov_read_counter ();
 278         skip_merge:;
 279         }
 280       gcov_sync (offset, length);
 281       if ((error = gcov_is_error ()))
 282         break;
 283     }
 284
 285   if (!gcov_is_eof ())
 286     {
 287       warning (error < 0 ? "`%s' has overflowed" : "`%s' is corrupted",
 288                da_file_name);
 289       htab_delete (counts_hash);
 290     }
 291
 292   gcov_close ();
 293 }
 294
 295 /* Returns the counters for a particular tag.  */
 296
 297 gcov_type *
 298 get_coverage_counts (unsigned counter, unsigned expected,
 299                      const struct gcov_ctr_summary **summary)
 300 {
 301   counts_entry_t *entry, elt;
 302
 303   /* No hash table, no counts.  */
 304   if (!counts_hash)
 305     {
 306       static int warned = 0;
 307
 308       if (!warned++)
 309         warning ("file %s not found, execution counts assumed to be zero",
 310                  da_file_name);
 311       return NULL;
 312     }
 313
 314   elt.ident = current_function_funcdef_no + 1;
 315   elt.ctr = counter;
 316   entry = htab_find (counts_hash, &elt);
 317   if (!entry)
 318     {
 319       warning ("no coverage for function '%s' found.", IDENTIFIER_POINTER
 320                (DECL_ASSEMBLER_NAME (current_function_decl)));
 321       return 0;
 322     }
 323
 324   if (expected != entry->summary.num
 325       || compute_checksum () != entry->checksum)
 326     {
 327       warning ("coverage mismatch for `%s'", IDENTIFIER_POINTER
 328                (DECL_ASSEMBLER_NAME (current_function_decl)));
 329       return NULL;
 330     }
 331
 332   if (summary)
 333     *summary = &entry->summary;
 334
 335   return entry->counts;
 336 }
 337
 338 /* Allocate NUM counters of type COUNTER. Returns nonzero if the
 339    allocation succeeded.  */
 340
 341 int
 342 coverage_counter_alloc (unsigned counter, unsigned num)
 343 {
 344   if (no_coverage)
 345     return 0;
 346
 347   if (!num)
 348     return 1;
 349
 350   if (!ctr_labels[counter])
 351     {
 352       /* Generate and save a copy of this so it can be shared.  */
 353       char buf[20];
 354
 355       ASM_GENERATE_INTERNAL_LABEL (buf, "LPBX", counter + 1);
 356       ctr_labels[counter] = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (buf));
 357     }
 358   fn_b_ctrs[counter] = fn_n_ctrs[counter];
 359   fn_n_ctrs[counter] += num;
 360   fn_ctr_mask |= 1 << counter;
 361   return 1;
 362 }
 363
 364 /* Generate a MEM rtl to access COUNTER NO.  */
 365
 366 rtx
 367 coverage_counter_ref (unsigned counter, unsigned no)
 368 {
 369   unsigned gcov_size = tree_low_cst (TYPE_SIZE (GCOV_TYPE_NODE), 1);
 370   enum machine_mode mode = mode_for_size (gcov_size, MODE_INT, 0);
 371   rtx ref;
 372
 373   if (no >= fn_n_ctrs[counter] - fn_b_ctrs[counter])
 374     abort ();
 375   no += prg_n_ctrs[counter] + fn_b_ctrs[counter];
 376   ref = plus_constant (ctr_labels[counter], gcov_size / BITS_PER_UNIT * no);
 377   ref = gen_rtx_MEM (mode, ref);
 378   set_mem_alias_set (ref, new_alias_set ());
 379
 380   return ref;
 381 }
 382 \f
 383 /* Generate a checksum for a string.  CHKSUM is the current
 384    checksum.  */
 385
 386 static unsigned
 387 checksum_string (unsigned chksum, const char *string)
 388 {
 389   do
 390     {
 391       unsigned value = *string << 24;
 392       unsigned ix;
 393
 394       for (ix = 8; ix--; value <<= 1)
 395         {
 396           unsigned feedback;
 397
 398           feedback = (value ^ chksum) & 0x80000000 ? 0x04c11db7 : 0;
 399           chksum <<= 1;
 400           chksum ^= feedback;
 401         }
 402     }
 403   while (*string++);
 404
 405   return chksum;
 406 }
 407
 408 /* Compute checksum for the current function.  We generate a CRC32.  */
 409
 410 static unsigned
 411 compute_checksum (void)
 412 {
 413   unsigned chksum = DECL_SOURCE_LINE (current_function_decl);
 414
 415   chksum = checksum_string (chksum, DECL_SOURCE_FILE (current_function_decl));
 416   chksum = checksum_string
 417     (chksum, IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (current_function_decl)));
 418
 419   return chksum;
 420 }
 421 \f
 422 /* Begin output to the graph file for the current function.
 423    Opens the output file, if not already done. Writes the
 424    function header, if not already done. Returns nonzero if data
 425    should be output.  */
 426
 427 int
 428 coverage_begin_output (void)
 429 {
 430   if (no_coverage)
 431     return 0;
 432
 433   if (!bbg_function_announced)
 434     {
 435       const char *file = DECL_SOURCE_FILE (current_function_decl);
 436       unsigned line = DECL_SOURCE_LINE (current_function_decl);
 437       unsigned long offset;
 438
 439       if (!bbg_file_opened)
 440         {
 441           if (!gcov_open (bbg_file_name, -1))
 442             error ("cannot open %s", bbg_file_name);
 443           else
 444             {
 445               gcov_write_unsigned (GCOV_NOTE_MAGIC);
 446               gcov_write_unsigned (GCOV_VERSION);
 447               gcov_write_unsigned (local_tick);
 448             }
 449           bbg_file_opened = 1;
 450         }
 451
 452       /* Announce function */
 453       offset = gcov_write_tag (GCOV_TAG_FUNCTION);
 454       gcov_write_unsigned (current_function_funcdef_no + 1);
 455       gcov_write_unsigned (compute_checksum ());
 456       gcov_write_string (IDENTIFIER_POINTER
 457                          (DECL_ASSEMBLER_NAME (current_function_decl)));
 458       gcov_write_string (file);
 459       gcov_write_unsigned (line);
 460       gcov_write_length (offset);
 461
 462       bbg_function_announced = 1;
 463     }
 464   return !gcov_is_error ();
 465 }
 466
 467 /* Finish coverage data for the current function. Verify no output
 468    error has occurred.  Save function coverage counts.  */
 469
 470 void
 471 coverage_end_function (void)
 472 {
 473   unsigned i;
 474
 475   if (bbg_file_opened > 1 && gcov_is_error ())
 476     {
 477       warning ("error writing `%s'", bbg_file_name);
 478       bbg_file_opened = -1;
 479     }
 480
 481   if (fn_ctr_mask)
 482     {
 483       struct function_list *item;
 484
 485       item = xmalloc (sizeof (struct function_list));
 486
 487       *functions_tail = item;
 488       functions_tail = &item->next;
 489
 490       item->next = 0;
 491       item->ident = current_function_funcdef_no + 1;
 492       item->checksum = compute_checksum ();
 493       for (i = 0; i != GCOV_COUNTERS; i++)
 494         {
 495           item->n_ctrs[i] = fn_n_ctrs[i];
 496           prg_n_ctrs[i] += fn_n_ctrs[i];
 497           fn_n_ctrs[i] = fn_b_ctrs[i] = 0;
 498         }
 499       prg_ctr_mask |= fn_ctr_mask;
 500       fn_ctr_mask = 0;
 501     }
 502   bbg_function_announced = 0;
 503 }
 504
 505 /* Creates the gcov_fn_info RECORD_TYPE.  */
 506
 507 static tree
 508 build_fn_info_type (unsigned int counters)
 509 {
 510   tree type = (*lang_hooks.types.make_type) (RECORD_TYPE);
 511   tree field, fields;
 512   tree array_type;
 513
 514   /* ident */
 515   fields = build_decl (FIELD_DECL, NULL_TREE, unsigned_intSI_type_node);
 516
 517   /* checksum */
 518   field = build_decl (FIELD_DECL, NULL_TREE, unsigned_intSI_type_node);
 519   TREE_CHAIN (field) = fields;
 520   fields = field;
 521
 522   array_type = build_index_type (build_int_2 (counters - 1, 0));
 523   array_type = build_array_type (unsigned_type_node, array_type);
 524
 525   /* counters */
 526   field = build_decl (FIELD_DECL, NULL_TREE, array_type);
 527   TREE_CHAIN (field) = fields;
 528   fields = field;
 529
 530   finish_builtin_struct (type, "__gcov_fn_info", fields, NULL_TREE);
 531
 532   return type;
 533 }
 534
 535 /* Creates a CONSTRUCTOR for a gcov_fn_info. FUNCTION is
 536    the function being processed and TYPE is the gcov_fn_info
 537    RECORD_TYPE.  */
 538
 539 static tree
 540 build_fn_info_value (const struct function_list *function, tree type)
 541 {
 542   tree value = NULL_TREE;
 543   tree fields = TYPE_FIELDS (type);
 544   unsigned ix;
 545   tree array_value = NULL_TREE;
 546
 547   /* ident */
 548   value = tree_cons (fields,
 549                      convert (unsigned_intSI_type_node,
 550                               build_int_2 (function->ident, 0)),
 551                      value);
 552   fields = TREE_CHAIN (fields);
 553
 554   /* checksum */
 555   value = tree_cons (fields,
 556                      convert (unsigned_intSI_type_node,
 557                               build_int_2 (function->checksum, 0)),
 558                      value);
 559   fields = TREE_CHAIN (fields);
 560
 561   /* counters */
 562   for (ix = 0; ix != GCOV_COUNTERS; ix++)
 563     if (prg_ctr_mask & (1 << ix))
 564       {
 565         tree counters = convert (unsigned_type_node,
 566                                  build_int_2 (function->n_ctrs[ix], 0));
 567
 568         array_value = tree_cons (NULL_TREE, counters, array_value);
 569       }
 570
 571   array_value = build_constructor (TREE_TYPE (fields), nreverse (array_value));
 572   value = tree_cons (fields, array_value, value);
 573
 574   value = build_constructor (type, nreverse (value));
 575
 576   return value;
 577 }
 578
 579 /* Creates the gcov_ctr_info RECORD_TYPE.  */
 580
 581 static tree
 582 build_ctr_info_type (void)
 583 {
 584   tree type = (*lang_hooks.types.make_type) (RECORD_TYPE);
 585   tree field, fields = NULL_TREE;
 586   tree gcov_ptr_type = build_pointer_type (GCOV_TYPE_NODE);
 587   tree gcov_merge_fn_type;
 588
 589   /* counters */
 590   field = build_decl (FIELD_DECL, NULL_TREE, unsigned_intSI_type_node);
 591   TREE_CHAIN (field) = fields;
 592   fields = field;
 593
 594   /* values */
 595   field = build_decl (FIELD_DECL, NULL_TREE, gcov_ptr_type);
 596   TREE_CHAIN (field) = fields;
 597   fields = field;
 598
 599   /* merge */
 600   gcov_merge_fn_type =
 601     build_function_type_list (void_type_node,
 602                               gcov_ptr_type, unsigned_type_node,
 603                               NULL_TREE);
 604   field = build_decl (FIELD_DECL, NULL_TREE,
 605                       build_pointer_type (gcov_merge_fn_type));
 606   TREE_CHAIN (field) = fields;
 607   fields = field;
 608
 609   finish_builtin_struct (type, "__gcov_ctr_info", fields, NULL_TREE);
 610
 611   return type;
 612 }
 613
 614 /* Creates a CONSTRUCTOR for a gcov_ctr_info. COUNTER is
 615    the counter being processed and TYPE is the gcov_ctr_info
 616    RECORD_TYPE.  */
 617
 618 static tree
 619 build_ctr_info_value (unsigned int counter, tree type)
 620 {
 621   tree value = NULL_TREE;
 622   tree fields = TYPE_FIELDS (type);
 623   tree fn;
 624
 625   /* counters */
 626   value = tree_cons (fields,
 627                      convert (unsigned_intSI_type_node,
 628                               build_int_2 (prg_n_ctrs[counter], 0)),
 629                      value);
 630   fields = TREE_CHAIN (fields);
 631
 632   if (prg_n_ctrs[counter])
 633     {
 634       tree array_type, array;
 635
 636       array_type = build_index_type (build_int_2 (prg_n_ctrs[counter] - 1, 0));
 637       array_type = build_array_type (TREE_TYPE (TREE_TYPE (fields)),
 638                                      array_type);
 639
 640       array = build (VAR_DECL, array_type, NULL_TREE, NULL_TREE);
 641       TREE_STATIC (array) = 1;
 642       DECL_NAME (array) = get_identifier (XSTR (ctr_labels[counter], 0));
 643       assemble_variable (array, 0, 0, 0);
 644
 645       value = tree_cons (fields,
 646                          build1 (ADDR_EXPR, TREE_TYPE (fields), array),
 647                          value);
 648     }
 649   else
 650     value = tree_cons (fields, null_pointer_node, value);
 651   fields = TREE_CHAIN (fields);
 652
 653   fn = build_decl (FUNCTION_DECL,
 654                    get_identifier (ctr_merge_functions[counter]),
 655                    TREE_TYPE (TREE_TYPE (fields)));
 656   DECL_EXTERNAL (fn) = 1;
 657   TREE_PUBLIC (fn) = 1;
 658   DECL_ARTIFICIAL (fn) = 1;
 659   TREE_NOTHROW (fn) = 1;
 660   value = tree_cons (fields,
 661                      build1 (ADDR_EXPR, TREE_TYPE (fields), fn),
 662                      value);
 663
 664   value = build_constructor (type, nreverse (value));
 665
 666   return value;
 667 }
 668
 669 /* Creates the gcov_info RECORD_TYPE and initializer for it. Returns a
 670    CONSTRUCTOR.  */
 671
 672 static tree
 673 build_gcov_info (void)
 674 {
 675   unsigned n_ctr_types, ix;
 676   tree type, const_type;
 677   tree fn_info_type, fn_info_value = NULL_TREE;
 678   tree fn_info_ptr_type;
 679   tree ctr_info_type, ctr_info_ary_type, ctr_info_value = NULL_TREE;
 680   tree field, fields = NULL_TREE;
 681   tree value = NULL_TREE;
 682   tree filename_string;
 683   char *filename;
 684   int filename_len;
 685   unsigned n_fns;
 686   const struct function_list *fn;
 687   tree string_type;
 688
 689   /* Count the number of active counters.  */
 690   for (n_ctr_types = 0, ix = 0; ix != GCOV_COUNTERS; ix++)
 691     if (prg_ctr_mask & (1 << ix))
 692       n_ctr_types++;
 693
 694   type = (*lang_hooks.types.make_type) (RECORD_TYPE);
 695   const_type = build_qualified_type (type, TYPE_QUAL_CONST);
 696
 697   /* Version ident */
 698   field = build_decl (FIELD_DECL, NULL_TREE, unsigned_intSI_type_node);
 699   TREE_CHAIN (field) = fields;
 700   fields = field;
 701   value = tree_cons (field, convert (unsigned_intSI_type_node,
 702                                      build_int_2 (GCOV_VERSION, 0)),
 703                      value);
 704
 705   /* next -- NULL */
 706   field = build_decl (FIELD_DECL, NULL_TREE, build_pointer_type (const_type));
 707   TREE_CHAIN (field) = fields;
 708   fields = field;
 709   value = tree_cons (field, null_pointer_node, value);
 710
 711   /* stamp */
 712   field = build_decl (FIELD_DECL, NULL_TREE, unsigned_intSI_type_node);
 713   TREE_CHAIN (field) = fields;
 714   fields = field;
 715   value = tree_cons (field, convert (unsigned_intSI_type_node,
 716                                      build_int_2 (local_tick, 0)),
 717                      value);
 718
 719   /* Filename */
 720   string_type = build_pointer_type (build_qualified_type (char_type_node,
 721                                                     TYPE_QUAL_CONST));
 722   field = build_decl (FIELD_DECL, NULL_TREE, string_type);
 723   TREE_CHAIN (field) = fields;
 724   fields = field;
 725   filename = getpwd ();
 726   filename = (filename && da_file_name[0] != '/'
 727               ? concat (filename, "/", da_file_name, NULL)
 728               : da_file_name);
 729   filename_len = strlen (filename);
 730   filename_string = build_string (filename_len + 1, filename);
 731   if (filename != da_file_name)
 732     free (filename);
 733   TREE_TYPE (filename_string) =
 734           build_array_type (char_type_node,
 735                             build_index_type (build_int_2 (filename_len, 0)));
 736   value = tree_cons (field, build1 (ADDR_EXPR, string_type, filename_string),
 737                      value);
 738
 739   /* Build the fn_info type and initializer.  */
 740   fn_info_type = build_fn_info_type (n_ctr_types);
 741   fn_info_ptr_type = build_pointer_type (build_qualified_type
 742                                          (fn_info_type, TYPE_QUAL_CONST));
 743   for (fn = functions_head, n_fns = 0; fn; fn = fn->next, n_fns++)
 744     fn_info_value = tree_cons (NULL_TREE,
 745                                build_fn_info_value (fn, fn_info_type),
 746                                fn_info_value);
 747   if (n_fns)
 748     {
 749       tree array_type;
 750
 751       array_type = build_index_type (build_int_2 (n_fns - 1, 0));
 752       array_type = build_array_type (fn_info_type, array_type);
 753
 754       fn_info_value = build_constructor (array_type, nreverse (fn_info_value));
 755       fn_info_value = build1 (ADDR_EXPR, fn_info_ptr_type, fn_info_value);
 756     }
 757   else
 758     fn_info_value = null_pointer_node;
 759
 760   /* number of functions */
 761   field = build_decl (FIELD_DECL, NULL_TREE, unsigned_type_node);
 762   TREE_CHAIN (field) = fields;
 763   fields = field;
 764   value = tree_cons (field,
 765                      convert (unsigned_type_node, build_int_2 (n_fns, 0)),
 766                      value);
 767
 768   /* fn_info table */
 769   field = build_decl (FIELD_DECL, NULL_TREE, fn_info_ptr_type);
 770   TREE_CHAIN (field) = fields;
 771   fields = field;
 772   value = tree_cons (field, fn_info_value, value);
 773
 774   /* counter_mask */
 775   field = build_decl (FIELD_DECL, NULL_TREE, unsigned_type_node);
 776   TREE_CHAIN (field) = fields;
 777   fields = field;
 778   value = tree_cons (field,
 779                      convert (unsigned_type_node,
 780                               build_int_2 (prg_ctr_mask, 0)),
 781                      value);
 782
 783   /* counters */
 784   ctr_info_type = build_ctr_info_type ();
 785   ctr_info_ary_type = build_index_type (build_int_2 (n_ctr_types, 0));
 786   ctr_info_ary_type = build_array_type (ctr_info_type, ctr_info_ary_type);
 787   for (ix = 0; ix != GCOV_COUNTERS; ix++)
 788     if (prg_ctr_mask & (1 << ix))
 789       ctr_info_value = tree_cons (NULL_TREE,
 790                                   build_ctr_info_value (ix, ctr_info_type),
 791                                   ctr_info_value);
 792   ctr_info_value = build_constructor (ctr_info_ary_type,
 793                                       nreverse (ctr_info_value));
 794
 795   field = build_decl (FIELD_DECL, NULL_TREE, ctr_info_ary_type);
 796   TREE_CHAIN (field) = fields;
 797   fields = field;
 798   value = tree_cons (field, ctr_info_value, value);
 799
 800   finish_builtin_struct (type, "__gcov_info", fields, NULL_TREE);
 801
 802   value = build_constructor (type, nreverse (value));
 803
 804   return value;
 805 }
 806
 807 /* Write out the structure which libgcov uses to locate all the
 808    counters.  The structures used here must match those defined in
 809    gcov-io.h.  Write out the constructor to call __gcov_init.  */
 810
 811 static void
 812 create_coverage (void)
 813 {
 814   tree gcov_info, gcov_info_value;
 815   char name[20];
 816   char *ctor_name;
 817   tree ctor;
 818   rtx gcov_info_address;
 819
 820   no_coverage = 1; /* Disable any further coverage.  */
 821
 822   if (!prg_ctr_mask)
 823     return;
 824
 825   gcov_info_value = build_gcov_info ();
 826
 827   gcov_info = build (VAR_DECL, TREE_TYPE (gcov_info_value),
 828                      NULL_TREE, NULL_TREE);
 829   DECL_INITIAL (gcov_info) = gcov_info_value;
 830
 831   TREE_STATIC (gcov_info) = 1;
 832   ASM_GENERATE_INTERNAL_LABEL (name, "LPBX", 0);
 833   DECL_NAME (gcov_info) = get_identifier (name);
 834
 835   /* Build structure.  */
 836   assemble_variable (gcov_info, 0, 0, 0);
 837
 838   /* Build the constructor function to invoke __gcov_init.  */
 839   ctor_name = concat (IDENTIFIER_POINTER (get_file_function_name ('I')),
 840                       "_GCOV", NULL);
 841   ctor = build_decl (FUNCTION_DECL, get_identifier (ctor_name),
 842                      build_function_type (void_type_node, NULL_TREE));
 843   free (ctor_name);
 844   DECL_EXTERNAL (ctor) = 0;
 845
 846   /* It can be a static function as long as collect2 does not have
 847      to scan the object file to find its ctor/dtor routine.  */
 848   TREE_PUBLIC (ctor) = ! targetm.have_ctors_dtors;
 849   TREE_USED (ctor) = 1;
 850   DECL_RESULT (ctor) = build_decl (RESULT_DECL, NULL_TREE, void_type_node);
 851   DECL_UNINLINABLE (ctor) = 1;
 852
 853   ctor = (*lang_hooks.decls.pushdecl) (ctor);
 854   rest_of_decl_compilation (ctor, 0, 1, 0);
 855   announce_function (ctor);
 856   current_function_decl = ctor;
 857   DECL_INITIAL (ctor) = error_mark_node;
 858   make_decl_rtl (ctor, NULL);
 859   init_function_start (ctor);
 860   (*lang_hooks.decls.pushlevel) (0);
 861   expand_function_start (ctor, 0);
 862
 863   /* Actually generate the code to call __gcov_init.  */
 864   gcov_info_address = force_reg (Pmode, XEXP (DECL_RTL (gcov_info), 0));
 865   emit_library_call (gcov_init_libfunc, LCT_NORMAL, VOIDmode, 1,
 866                      gcov_info_address, Pmode);
 867
 868   expand_function_end ();
 869   (*lang_hooks.decls.poplevel) (1, 0, 1);
 870
 871   rest_of_compilation (ctor);
 872
 873   if (! quiet_flag)
 874     fflush (asm_out_file);
 875   current_function_decl = NULL_TREE;
 876
 877   if (targetm.have_ctors_dtors)
 878     (* targetm.asm_out.constructor) (XEXP (DECL_RTL (ctor), 0),
 879                                      DEFAULT_INIT_PRIORITY);
 880 }
 881 \f
 882 /* Perform file-level initialization. Read in data file, generate name
 883    of graph file.  */
 884
 885 void
 886 coverage_init (const char *filename)
 887 {
 888   int len = strlen (filename);
 889
 890   /* Name of da file.  */
 891   da_file_name = (char *) xmalloc (len + strlen (GCOV_DATA_SUFFIX) + 1);
 892   strcpy (da_file_name, filename);
 893   strcat (da_file_name, GCOV_DATA_SUFFIX);
 894
 895   /* Name of bbg file.  */
 896   bbg_file_name = (char *) xmalloc (len + strlen (GCOV_NOTE_SUFFIX) + 1);
 897   strcpy (bbg_file_name, filename);
 898   strcat (bbg_file_name, GCOV_NOTE_SUFFIX);
 899
 900   read_counts_file ();
 901 }
 902
 903 /* Performs file-level cleanup.  Close graph file, generate coverage
 904    variables and constructor.  */
 905
 906 void
 907 coverage_finish (void)
 908 {
 909   create_coverage ();
 910   if (bbg_file_opened)
 911     {
 912       int error = gcov_close ();
 913
 914       if (error)
 915         unlink (bbg_file_name);
 916       if (!local_tick)
 917         /* Only remove the da file, if we cannot stamp it. If we can
 918            stamp it, libgcov will DTRT.  */
 919         unlink (da_file_name);
 920     }
 921 }
 922
 923 #include "gt-coverage.h"