1 /* File format for coverage information 2 Copyright (C) 1996, 1997, 1998, 2000, 2002, 3 2003, 2004, 2005, 2008, 2009 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. 22 23 You should have received a copy of the GNU General Public License and 24 a copy of the GCC Runtime Library Exception along with this program; 25 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 26 <http://www.gnu.org/licenses/>. */ 27 28 29 /* Coverage information is held in two files. A notes file, which is 30 generated by the compiler, and a data file, which is generated by 31 the program under test. Both files use a similar structure. We do 32 not attempt to make these files backwards compatible with previous 33 versions, as you only need coverage information when developing a 34 program. We do hold version information, so that mismatches can be 35 detected, and we use a format that allows tools to skip information 36 they do not understand or are not interested in. 37 38 Numbers are recorded in the 32 bit unsigned binary form of the 39 endianness of the machine generating the file. 64 bit numbers are 40 stored as two 32 bit numbers, the low part first. Strings are 41 padded with 1 to 4 NUL bytes, to bring the length up to a multiple 42 of 4. The number of 4 bytes is stored, followed by the padded 43 string. Zero length and NULL strings are simply stored as a length 44 of zero (they have no trailing NUL or padding). 45 46 int32: byte3 byte2 byte1 byte0 | byte0 byte1 byte2 byte3 47 int64: int32:low int32:high 48 string: int32:0 | int32:length char* char:0 padding 49 padding: | char:0 | char:0 char:0 | char:0 char:0 char:0 50 item: int32 | int64 | string 51 52 The basic format of the files is 53 54 file : int32:magic int32:version int32:stamp record* 55 56 The magic ident is different for the notes and the data files. The 57 magic ident is used to determine the endianness of the file, when 58 reading. The version is the same for both files and is derived 59 from gcc's version number. The stamp value is used to synchronize 60 note and data files and to synchronize merging within a data 61 file. It need not be an absolute time stamp, merely a ticker that 62 increments fast enough and cycles slow enough to distinguish 63 different compile/run/compile cycles. 64 65 Although the ident and version are formally 32 bit numbers, they 66 are derived from 4 character ASCII strings. The version number 67 consists of the single character major version number, a two 68 character minor version number (leading zero for versions less than 69 10), and a single character indicating the status of the release. 70 That will be 'e' experimental, 'p' prerelease and 'r' for release. 71 Because, by good fortune, these are in alphabetical order, string 72 collating can be used to compare version strings. Be aware that 73 the 'e' designation will (naturally) be unstable and might be 74 incompatible with itself. For gcc 3.4 experimental, it would be 75 '304e' (0x33303465). When the major version reaches 10, the 76 letters A-Z will be used. Assuming minor increments releases every 77 6 months, we have to make a major increment every 50 years. 78 Assuming major increments releases every 5 years, we're ok for the 79 next 155 years -- good enough for me. 80 81 A record has a tag, length and variable amount of data. 82 83 record: header data 84 header: int32:tag int32:length 85 data: item* 86 87 Records are not nested, but there is a record hierarchy. Tag 88 numbers reflect this hierarchy. Tags are unique across note and 89 data files. Some record types have a varying amount of data. The 90 LENGTH is the number of 4bytes that follow and is usually used to 91 determine how much data. The tag value is split into 4 8-bit 92 fields, one for each of four possible levels. The most significant 93 is allocated first. Unused levels are zero. Active levels are 94 odd-valued, so that the LSB of the level is one. A sub-level 95 incorporates the values of its superlevels. This formatting allows 96 you to determine the tag hierarchy, without understanding the tags 97 themselves, and is similar to the standard section numbering used 98 in technical documents. Level values [1..3f] are used for common 99 tags, values [41..9f] for the notes file and [a1..ff] for the data 100 file. 101 102 The basic block graph file contains the following records 103 note: unit function-graph* 104 unit: header int32:checksum string:source 105 function-graph: announce_function basic_blocks {arcs | lines}* 106 announce_function: header int32:ident int32:checksum 107 string:name string:source int32:lineno 108 basic_block: header int32:flags* 109 arcs: header int32:block_no arc* 110 arc: int32:dest_block int32:flags 111 lines: header int32:block_no line* 112 int32:0 string:NULL 113 line: int32:line_no | int32:0 string:filename 114 115 The BASIC_BLOCK record holds per-bb flags. The number of blocks 116 can be inferred from its data length. There is one ARCS record per 117 basic block. The number of arcs from a bb is implicit from the 118 data length. It enumerates the destination bb and per-arc flags. 119 There is one LINES record per basic block, it enumerates the source 120 lines which belong to that basic block. Source file names are 121 introduced by a line number of 0, following lines are from the new 122 source file. The initial source file for the function is NULL, but 123 the current source file should be remembered from one LINES record 124 to the next. The end of a block is indicated by an empty filename 125 - this does not reset the current source file. Note there is no 126 ordering of the ARCS and LINES records: they may be in any order, 127 interleaved in any manner. The current filename follows the order 128 the LINES records are stored in the file, *not* the ordering of the 129 blocks they are for. 130 131 The data file contains the following records. 132 data: {unit function-data* summary:object summary:program*}* 133 unit: header int32:checksum 134 function-data: announce_function arc_counts 135 announce_function: header int32:ident int32:checksum 136 arc_counts: header int64:count* 137 summary: int32:checksum {count-summary}GCOV_COUNTERS 138 count-summary: int32:num int32:runs int64:sum 139 int64:max int64:sum_max 140 141 The ANNOUNCE_FUNCTION record is the same as that in the note file, 142 but without the source location. The ARC_COUNTS gives the counter 143 values for those arcs that are instrumented. The SUMMARY records 144 give information about the whole object file and about the whole 145 program. The checksum is used for whole program summaries, and 146 disambiguates different programs which include the same 147 instrumented object file. There may be several program summaries, 148 each with a unique checksum. The object summary's checksum is zero. 149 Note that the data file might contain information from several runs 150 concatenated, or the data might be merged. 151 152 This file is included by both the compiler, gcov tools and the 153 runtime support library libgcov. IN_LIBGCOV and IN_GCOV are used to 154 distinguish which case is which. If IN_LIBGCOV is nonzero, 155 libgcov is being built. If IN_GCOV is nonzero, the gcov tools are 156 being built. Otherwise the compiler is being built. IN_GCOV may be 157 positive or negative. If positive, we are compiling a tool that 158 requires additional functions (see the code for knowledge of what 159 those functions are). */ 160 161 #ifndef GCC_GCOV_IO_H 162 #define GCC_GCOV_IO_H 163 164 #if IN_LIBGCOV 165 /* About the target */ 166 167 #if BITS_PER_UNIT == 8 168 typedef unsigned gcov_unsigned_t __attribute__ ((mode (SI))); 169 typedef unsigned gcov_position_t __attribute__ ((mode (SI))); 170 #if LONG_LONG_TYPE_SIZE > 32 171 typedef signed gcov_type __attribute__ ((mode (DI))); 172 #else 173 typedef signed gcov_type __attribute__ ((mode (SI))); 174 #endif 175 #else 176 #if BITS_PER_UNIT == 16 177 typedef unsigned gcov_unsigned_t __attribute__ ((mode (HI))); 178 typedef unsigned gcov_position_t __attribute__ ((mode (HI))); 179 #if LONG_LONG_TYPE_SIZE > 32 180 typedef signed gcov_type __attribute__ ((mode (SI))); 181 #else 182 typedef signed gcov_type __attribute__ ((mode (HI))); 183 #endif 184 #else 185 typedef unsigned gcov_unsigned_t __attribute__ ((mode (QI))); 186 typedef unsigned gcov_position_t __attribute__ ((mode (QI))); 187 #if LONG_LONG_TYPE_SIZE > 32 188 typedef signed gcov_type __attribute__ ((mode (HI))); 189 #else 190 typedef signed gcov_type __attribute__ ((mode (QI))); 191 #endif 192 #endif 193 #endif 194 195 196 #if defined (TARGET_POSIX_IO) 197 #define GCOV_LOCKED 1 198 #else 199 #define GCOV_LOCKED 0 200 #endif 201 202 #else /* !IN_LIBGCOV */ 203 /* About the host */ 204 205 typedef unsigned gcov_unsigned_t; 206 typedef unsigned gcov_position_t; 207 /* gcov_type is typedef'd elsewhere for the compiler */ 208 #if IN_GCOV 209 #define GCOV_LINKAGE static 210 typedef HOST_WIDEST_INT gcov_type; 211 #if IN_GCOV > 0 212 #include <sys/types.h> 213 #endif 214 #else /*!IN_GCOV */ 215 #define GCOV_TYPE_SIZE (LONG_LONG_TYPE_SIZE > 32 ? 64 : 32) 216 #endif 217 218 #if defined (HOST_HAS_F_SETLKW) 219 #define GCOV_LOCKED 1 220 #else 221 #define GCOV_LOCKED 0 222 #endif 223 224 #endif /* !IN_LIBGCOV */ 225 226 /* In gcov we want function linkage to be static. In the compiler we want 227 it extern, so that they can be accessed from elsewhere. In libgcov we 228 need these functions to be extern, so prefix them with __gcov. In 229 libgcov they must also be hidden so that the instance in the executable 230 is not also used in a DSO. */ 231 #if IN_LIBGCOV 232 233 #include "tconfig.h" 234 235 #define gcov_var __gcov_var 236 #define gcov_open __gcov_open 237 #define gcov_close __gcov_close 238 #define gcov_write_tag_length __gcov_write_tag_length 239 #define gcov_position __gcov_position 240 #define gcov_seek __gcov_seek 241 #define gcov_rewrite __gcov_rewrite 242 #define gcov_is_error __gcov_is_error 243 #define gcov_write_unsigned __gcov_write_unsigned 244 #define gcov_write_counter __gcov_write_counter 245 #define gcov_write_summary __gcov_write_summary 246 #define gcov_read_unsigned __gcov_read_unsigned 247 #define gcov_read_counter __gcov_read_counter 248 #define gcov_read_summary __gcov_read_summary 249 250 /* Poison these, so they don't accidentally slip in. */ 251 #pragma GCC poison gcov_write_string gcov_write_tag gcov_write_length 252 #pragma GCC poison gcov_read_string gcov_sync gcov_time gcov_magic 253 254 #ifdef HAVE_GAS_HIDDEN 255 #define ATTRIBUTE_HIDDEN __attribute__ ((__visibility__ ("hidden"))) 256 #else 257 #define ATTRIBUTE_HIDDEN 258 #endif 259 260 #else 261 262 #define ATTRIBUTE_HIDDEN 263 264 #endif 265 266 #ifndef GCOV_LINKAGE 267 #define GCOV_LINKAGE extern 268 #endif 269 270 /* File suffixes. */ 271 #define GCOV_DATA_SUFFIX ".gcda" 272 #define GCOV_NOTE_SUFFIX ".gcno" 273 274 /* File magic. Must not be palindromes. */ 275 #define GCOV_DATA_MAGIC ((gcov_unsigned_t)0x67636461) /* "gcda" */ 276 #define GCOV_NOTE_MAGIC ((gcov_unsigned_t)0x67636e6f) /* "gcno" */ 277 278 /* gcov-iov.h is automatically generated by the makefile from 279 version.c, it looks like 280 #define GCOV_VERSION ((gcov_unsigned_t)0x89abcdef) 281 */ 282 #include "gcov-iov.h" 283 284 /* Convert a magic or version number to a 4 character string. */ 285 #define GCOV_UNSIGNED2STRING(ARRAY,VALUE) \ 286 ((ARRAY)[0] = (char)((VALUE) >> 24), \ 287 (ARRAY)[1] = (char)((VALUE) >> 16), \ 288 (ARRAY)[2] = (char)((VALUE) >> 8), \ 289 (ARRAY)[3] = (char)((VALUE) >> 0)) 290 291 /* The record tags. Values [1..3f] are for tags which may be in either 292 file. Values [41..9f] for those in the note file and [a1..ff] for 293 the data file. The tag value zero is used as an explicit end of 294 file marker -- it is not required to be present. */ 295 296 #define GCOV_TAG_FUNCTION ((gcov_unsigned_t)0x01000000) 297 #define GCOV_TAG_FUNCTION_LENGTH (2) 298 #define GCOV_TAG_BLOCKS ((gcov_unsigned_t)0x01410000) 299 #define GCOV_TAG_BLOCKS_LENGTH(NUM) (NUM) 300 #define GCOV_TAG_BLOCKS_NUM(LENGTH) (LENGTH) 301 #define GCOV_TAG_ARCS ((gcov_unsigned_t)0x01430000) 302 #define GCOV_TAG_ARCS_LENGTH(NUM) (1 + (NUM) * 2) 303 #define GCOV_TAG_ARCS_NUM(LENGTH) (((LENGTH) - 1) / 2) 304 #define GCOV_TAG_LINES ((gcov_unsigned_t)0x01450000) 305 #define GCOV_TAG_COUNTER_BASE ((gcov_unsigned_t)0x01a10000) 306 #define GCOV_TAG_COUNTER_LENGTH(NUM) ((NUM) * 2) 307 #define GCOV_TAG_COUNTER_NUM(LENGTH) ((LENGTH) / 2) 308 #define GCOV_TAG_OBJECT_SUMMARY ((gcov_unsigned_t)0xa1000000) 309 #define GCOV_TAG_PROGRAM_SUMMARY ((gcov_unsigned_t)0xa3000000) 310 #define GCOV_TAG_SUMMARY_LENGTH \ 311 (1 + GCOV_COUNTERS_SUMMABLE * (2 + 3 * 2)) 312 313 /* Counters that are collected. */ 314 #define GCOV_COUNTER_ARCS 0 /* Arc transitions. */ 315 #define GCOV_COUNTERS_SUMMABLE 1 /* Counters which can be 316 summaried. */ 317 #define GCOV_FIRST_VALUE_COUNTER 1 /* The first of counters used for value 318 profiling. They must form a consecutive 319 interval and their order must match 320 the order of HIST_TYPEs in 321 value-prof.h. */ 322 #define GCOV_COUNTER_V_INTERVAL 1 /* Histogram of value inside an interval. */ 323 #define GCOV_COUNTER_V_POW2 2 /* Histogram of exact power2 logarithm 324 of a value. */ 325 #define GCOV_COUNTER_V_SINGLE 3 /* The most common value of expression. */ 326 #define GCOV_COUNTER_V_DELTA 4 /* The most common difference between 327 consecutive values of expression. */ 328 329 #define GCOV_COUNTER_V_INDIR 5 /* The most common indirect address */ 330 #define GCOV_COUNTER_AVERAGE 6 /* Compute average value passed to the 331 counter. */ 332 #define GCOV_COUNTER_IOR 7 /* IOR of the all values passed to 333 counter. */ 334 #define GCOV_LAST_VALUE_COUNTER 7 /* The last of counters used for value 335 profiling. */ 336 #define GCOV_COUNTERS 8 337 338 /* Number of counters used for value profiling. */ 339 #define GCOV_N_VALUE_COUNTERS \ 340 (GCOV_LAST_VALUE_COUNTER - GCOV_FIRST_VALUE_COUNTER + 1) 341 342 /* A list of human readable names of the counters */ 343 #define GCOV_COUNTER_NAMES {"arcs", "interval", "pow2", "single", \ 344 "delta","indirect_call", "average", "ior"} 345 346 /* Names of merge functions for counters. */ 347 #define GCOV_MERGE_FUNCTIONS {"__gcov_merge_add", \ 348 "__gcov_merge_add", \ 349 "__gcov_merge_add", \ 350 "__gcov_merge_single", \ 351 "__gcov_merge_delta", \ 352 "__gcov_merge_single", \ 353 "__gcov_merge_add", \ 354 "__gcov_merge_ior"} 355 356 /* Convert a counter index to a tag. */ 357 #define GCOV_TAG_FOR_COUNTER(COUNT) \ 358 (GCOV_TAG_COUNTER_BASE + ((gcov_unsigned_t)(COUNT) << 17)) 359 /* Convert a tag to a counter. */ 360 #define GCOV_COUNTER_FOR_TAG(TAG) \ 361 ((unsigned)(((TAG) - GCOV_TAG_COUNTER_BASE) >> 17)) 362 /* Check whether a tag is a counter tag. */ 363 #define GCOV_TAG_IS_COUNTER(TAG) \ 364 (!((TAG) & 0xFFFF) && GCOV_COUNTER_FOR_TAG (TAG) < GCOV_COUNTERS) 365 366 /* The tag level mask has 1's in the position of the inner levels, & 367 the lsb of the current level, and zero on the current and outer 368 levels. */ 369 #define GCOV_TAG_MASK(TAG) (((TAG) - 1) ^ (TAG)) 370 371 /* Return nonzero if SUB is an immediate subtag of TAG. */ 372 #define GCOV_TAG_IS_SUBTAG(TAG,SUB) \ 373 (GCOV_TAG_MASK (TAG) >> 8 == GCOV_TAG_MASK (SUB) \ 374 && !(((SUB) ^ (TAG)) & ~GCOV_TAG_MASK(TAG))) 375 376 /* Return nonzero if SUB is at a sublevel to TAG. */ 377 #define GCOV_TAG_IS_SUBLEVEL(TAG,SUB) \ 378 (GCOV_TAG_MASK (TAG) > GCOV_TAG_MASK (SUB)) 379 380 /* Basic block flags. */ 381 #define GCOV_BLOCK_UNEXPECTED (1 << 1) 382 383 /* Arc flags. */ 384 #define GCOV_ARC_ON_TREE (1 << 0) 385 #define GCOV_ARC_FAKE (1 << 1) 386 #define GCOV_ARC_FALLTHROUGH (1 << 2) 387 388 /* Structured records. */ 389 390 /* Cumulative counter data. */ 391 struct gcov_ctr_summary 392 { 393 gcov_unsigned_t num; /* number of counters. */ 394 gcov_unsigned_t runs; /* number of program runs */ 395 gcov_type sum_all; /* sum of all counters accumulated. */ 396 gcov_type run_max; /* maximum value on a single run. */ 397 gcov_type sum_max; /* sum of individual run max values. */ 398 }; 399 400 /* Object & program summary record. */ 401 struct gcov_summary 402 { 403 gcov_unsigned_t checksum; /* checksum of program */ 404 struct gcov_ctr_summary ctrs[GCOV_COUNTERS_SUMMABLE]; 405 }; 406 407 /* Structures embedded in coveraged program. The structures generated 408 by write_profile must match these. */ 409 410 #if IN_LIBGCOV 411 /* Information about a single function. This uses the trailing array 412 idiom. The number of counters is determined from the counter_mask 413 in gcov_info. We hold an array of function info, so have to 414 explicitly calculate the correct array stride. */ 415 struct gcov_fn_info 416 { 417 gcov_unsigned_t ident; /* unique ident of function */ 418 gcov_unsigned_t checksum; /* function checksum */ 419 unsigned n_ctrs[0]; /* instrumented counters */ 420 }; 421 422 /* Type of function used to merge counters. */ 423 typedef void (*gcov_merge_fn) (gcov_type *, gcov_unsigned_t); 424 425 /* Information about counters. */ 426 struct gcov_ctr_info 427 { 428 gcov_unsigned_t num; /* number of counters. */ 429 gcov_type *values; /* their values. */ 430 gcov_merge_fn merge; /* The function used to merge them. */ 431 }; 432 433 /* Information about a single object file. */ 434 struct gcov_info 435 { 436 gcov_unsigned_t version; /* expected version number */ 437 struct gcov_info *next; /* link to next, used by libgcov */ 438 439 gcov_unsigned_t stamp; /* uniquifying time stamp */ 440 const char *filename; /* output file name */ 441 442 unsigned n_functions; /* number of functions */ 443 const struct gcov_fn_info *functions; /* table of functions */ 444 445 unsigned ctr_mask; /* mask of counters instrumented. */ 446 struct gcov_ctr_info counts[0]; /* count data. The number of bits 447 set in the ctr_mask field 448 determines how big this array 449 is. */ 450 }; 451 452 /* Register a new object file module. */ 453 extern void __gcov_init (struct gcov_info *) ATTRIBUTE_HIDDEN; 454 455 /* Called before fork, to avoid double counting. */ 456 extern void __gcov_flush (void) ATTRIBUTE_HIDDEN; 457 458 /* The merge function that just sums the counters. */ 459 extern void __gcov_merge_add (gcov_type *, unsigned) ATTRIBUTE_HIDDEN; 460 461 /* The merge function to choose the most common value. */ 462 extern void __gcov_merge_single (gcov_type *, unsigned) ATTRIBUTE_HIDDEN; 463 464 /* The merge function to choose the most common difference between 465 consecutive values. */ 466 extern void __gcov_merge_delta (gcov_type *, unsigned) ATTRIBUTE_HIDDEN; 467 468 /* The merge function that just ors the counters together. */ 469 extern void __gcov_merge_ior (gcov_type *, unsigned) ATTRIBUTE_HIDDEN; 470 471 /* The profiler functions. */ 472 extern void __gcov_interval_profiler (gcov_type *, gcov_type, int, unsigned); 473 extern void __gcov_pow2_profiler (gcov_type *, gcov_type); 474 extern void __gcov_one_value_profiler (gcov_type *, gcov_type); 475 extern void __gcov_indirect_call_profiler (gcov_type *, gcov_type, void *, void *); 476 extern void __gcov_average_profiler (gcov_type *, gcov_type); 477 extern void __gcov_ior_profiler (gcov_type *, gcov_type); 478 479 #ifndef inhibit_libc 480 /* The wrappers around some library functions.. */ 481 extern pid_t __gcov_fork (void) ATTRIBUTE_HIDDEN; 482 extern int __gcov_execl (const char *, char *, ...) ATTRIBUTE_HIDDEN; 483 extern int __gcov_execlp (const char *, char *, ...) ATTRIBUTE_HIDDEN; 484 extern int __gcov_execle (const char *, char *, ...) ATTRIBUTE_HIDDEN; 485 extern int __gcov_execv (const char *, char *const []) ATTRIBUTE_HIDDEN; 486 extern int __gcov_execvp (const char *, char *const []) ATTRIBUTE_HIDDEN; 487 extern int __gcov_execve (const char *, char *const [], char *const []) 488 ATTRIBUTE_HIDDEN; 489 #endif 490 491 #endif /* IN_LIBGCOV */ 492 493 #if IN_LIBGCOV >= 0 494 495 /* Optimum number of gcov_unsigned_t's read from or written to disk. */ 496 #define GCOV_BLOCK_SIZE (1 << 10) 497 498 GCOV_LINKAGE struct gcov_var 499 { 500 FILE *file; 501 gcov_position_t start; /* Position of first byte of block */ 502 unsigned offset; /* Read/write position within the block. */ 503 unsigned length; /* Read limit in the block. */ 504 unsigned overread; /* Number of words overread. */ 505 int error; /* < 0 overflow, > 0 disk error. */ 506 int mode; /* < 0 writing, > 0 reading */ 507 #if IN_LIBGCOV 508 /* Holds one block plus 4 bytes, thus all coverage reads & writes 509 fit within this buffer and we always can transfer GCOV_BLOCK_SIZE 510 to and from the disk. libgcov never backtracks and only writes 4 511 or 8 byte objects. */ 512 gcov_unsigned_t buffer[GCOV_BLOCK_SIZE + 1]; 513 #else 514 int endian; /* Swap endianness. */ 515 /* Holds a variable length block, as the compiler can write 516 strings and needs to backtrack. */ 517 size_t alloc; 518 gcov_unsigned_t *buffer; 519 #endif 520 } gcov_var ATTRIBUTE_HIDDEN; 521 522 /* Functions for reading and writing gcov files. In libgcov you can 523 open the file for reading then writing. Elsewhere you can open the 524 file either for reading or for writing. When reading a file you may 525 use the gcov_read_* functions, gcov_sync, gcov_position, & 526 gcov_error. When writing a file you may use the gcov_write 527 functions, gcov_seek & gcov_error. When a file is to be rewritten 528 you use the functions for reading, then gcov_rewrite then the 529 functions for writing. Your file may become corrupted if you break 530 these invariants. */ 531 #if IN_LIBGCOV 532 GCOV_LINKAGE int gcov_open (const char */*name*/) ATTRIBUTE_HIDDEN; 533 #else 534 GCOV_LINKAGE int gcov_open (const char */*name*/, int /*direction*/); 535 GCOV_LINKAGE int gcov_magic (gcov_unsigned_t, gcov_unsigned_t); 536 #endif 537 GCOV_LINKAGE int gcov_close (void) ATTRIBUTE_HIDDEN; 538 539 /* Available everywhere. */ 540 static gcov_position_t gcov_position (void); 541 static int gcov_is_error (void); 542 543 GCOV_LINKAGE gcov_unsigned_t gcov_read_unsigned (void) ATTRIBUTE_HIDDEN; 544 GCOV_LINKAGE gcov_type gcov_read_counter (void) ATTRIBUTE_HIDDEN; 545 GCOV_LINKAGE void gcov_read_summary (struct gcov_summary *) ATTRIBUTE_HIDDEN; 546 547 #if IN_LIBGCOV 548 /* Available only in libgcov */ 549 GCOV_LINKAGE void gcov_write_counter (gcov_type) ATTRIBUTE_HIDDEN; 550 GCOV_LINKAGE void gcov_write_tag_length (gcov_unsigned_t, gcov_unsigned_t) 551 ATTRIBUTE_HIDDEN; 552 GCOV_LINKAGE void gcov_write_summary (gcov_unsigned_t /*tag*/, 553 const struct gcov_summary *) 554 ATTRIBUTE_HIDDEN; 555 static void gcov_rewrite (void); 556 GCOV_LINKAGE void gcov_seek (gcov_position_t /*position*/) ATTRIBUTE_HIDDEN; 557 #else 558 /* Available outside libgcov */ 559 GCOV_LINKAGE const char *gcov_read_string (void); 560 GCOV_LINKAGE void gcov_sync (gcov_position_t /*base*/, 561 gcov_unsigned_t /*length */); 562 #endif 563 564 #if !IN_GCOV 565 /* Available outside gcov */ 566 GCOV_LINKAGE void gcov_write_unsigned (gcov_unsigned_t) ATTRIBUTE_HIDDEN; 567 #endif 568 569 #if !IN_GCOV && !IN_LIBGCOV 570 /* Available only in compiler */ 571 GCOV_LINKAGE void gcov_write_string (const char *); 572 GCOV_LINKAGE gcov_position_t gcov_write_tag (gcov_unsigned_t); 573 GCOV_LINKAGE void gcov_write_length (gcov_position_t /*position*/); 574 #endif 575 576 #if IN_GCOV > 0 577 /* Available in gcov */ 578 GCOV_LINKAGE time_t gcov_time (void); 579 #endif 580 581 /* Save the current position in the gcov file. */ 582 583 static inline gcov_position_t 584 gcov_position (void) 585 { 586 gcc_assert (gcov_var.mode > 0); 587 return gcov_var.start + gcov_var.offset; 588 } 589 590 /* Return nonzero if the error flag is set. */ 591 592 static inline int 593 gcov_is_error (void) 594 { 595 return gcov_var.file ? gcov_var.error : 1; 596 } 597 598 #if IN_LIBGCOV 599 /* Move to beginning of file and initialize for writing. */ 600 601 static inline void 602 gcov_rewrite (void) 603 { 604 gcc_assert (gcov_var.mode > 0); 605 gcov_var.mode = -1; 606 gcov_var.start = 0; 607 gcov_var.offset = 0; 608 fseek (gcov_var.file, 0L, SEEK_SET); 609 } 610 #endif 611 612 #endif /* IN_LIBGCOV >= 0 */ 613 614 #endif /* GCC_GCOV_IO_H */ 615