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1 /* File format for coverage information
2 Copyright (C) 1996, 1997, 1998, 2000, 2002,
3 2003, 2004, 2005 Free Software Foundation, Inc.
4 Contributed by Bob Manson <manson@cygnus.com>.
5 Completely remangled by Nathan Sidwell <nathan@codesourcery.com>.
7 This file is part of GCC.
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.
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.
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, 51 Franklin Street, Fifth Floor, Boston, MA
22 02110-1301, USA. */
24 /* As a special exception, if you link this library with other files,
25 some of which are compiled with GCC, to produce an executable,
26 this library does not by itself cause the resulting executable
27 to be covered by the GNU General Public License.
28 This exception does not however invalidate any other reasons why
29 the executable file might be covered by the GNU General Public License. */
31 /* Coverage information is held in two files. A notes file, which is
32 generated by the compiler, and a data file, which is generated by
33 the program under test. Both files use a similar structure. We do
34 not attempt to make these files backwards compatible with previous
35 versions, as you only need coverage information when developing a
36 program. We do hold version information, so that mismatches can be
37 detected, and we use a format that allows tools to skip information
38 they do not understand or are not interested in.
40 Numbers are recorded in the 32 bit unsigned binary form of the
41 endianness of the machine generating the file. 64 bit numbers are
42 stored as two 32 bit numbers, the low part first. Strings are
43 padded with 1 to 4 NUL bytes, to bring the length up to a multiple
44 of 4. The number of 4 bytes is stored, followed by the padded
45 string. Zero length and NULL strings are simply stored as a length
46 of zero (they have no trailing NUL or padding).
48 int32: byte3 byte2 byte1 byte0 | byte0 byte1 byte2 byte3
49 int64: int32:low int32:high
50 string: int32:0 | int32:length char* char:0 padding
51 padding: | char:0 | char:0 char:0 | char:0 char:0 char:0
52 item: int32 | int64 | string
54 The basic format of the files is
56 file : int32:magic int32:version int32:stamp record*
58 The magic ident is different for the notes and the data files. The
59 magic ident is used to determine the endianness of the file, when
60 reading. The version is the same for both files and is derived
61 from gcc's version number. The stamp value is used to synchronize
62 note and data files and to synchronize merging within a data
63 file. It need not be an absolute time stamp, merely a ticker that
64 increments fast enough and cycles slow enough to distinguish
65 different compile/run/compile cycles.
67 Although the ident and version are formally 32 bit numbers, they
68 are derived from 4 character ASCII strings. The version number
69 consists of the single character major version number, a two
70 character minor version number (leading zero for versions less than
71 10), and a single character indicating the status of the release.
72 That will be 'e' experimental, 'p' prerelease and 'r' for release.
73 Because, by good fortune, these are in alphabetical order, string
74 collating can be used to compare version strings. Be aware that
75 the 'e' designation will (naturally) be unstable and might be
76 incompatible with itself. For gcc 3.4 experimental, it would be
77 '304e' (0x33303465). When the major version reaches 10, the
78 letters A-Z will be used. Assuming minor increments releases every
79 6 months, we have to make a major increment every 50 years.
80 Assuming major increments releases every 5 years, we're ok for the
81 next 155 years -- good enough for me.
83 A record has a tag, length and variable amount of data.
85 record: header data
86 header: int32:tag int32:length
87 data: item*
89 Records are not nested, but there is a record hierarchy. Tag
90 numbers reflect this hierarchy. Tags are unique across note and
91 data files. Some record types have a varying amount of data. The
92 LENGTH is the number of 4bytes that follow and is usually used to
93 determine how much data. The tag value is split into 4 8-bit
94 fields, one for each of four possible levels. The most significant
95 is allocated first. Unused levels are zero. Active levels are
96 odd-valued, so that the LSB of the level is one. A sub-level
97 incorporates the values of its superlevels. This formatting allows
98 you to determine the tag hierarchy, without understanding the tags
99 themselves, and is similar to the standard section numbering used
100 in technical documents. Level values [1..3f] are used for common
101 tags, values [41..9f] for the notes file and [a1..ff] for the data
102 file.
104 The basic block graph file contains the following records
105 note: unit function-graph*
106 unit: header int32:checksum string:source
107 function-graph: announce_function basic_blocks {arcs | lines}*
108 announce_function: header int32:ident int32:checksum
109 string:name string:source int32:lineno
110 basic_block: header int32:flags*
111 arcs: header int32:block_no arc*
112 arc: int32:dest_block int32:flags
113 lines: header int32:block_no line*
114 int32:0 string:NULL
115 line: int32:line_no | int32:0 string:filename
117 The BASIC_BLOCK record holds per-bb flags. The number of blocks
118 can be inferred from its data length. There is one ARCS record per
119 basic block. The number of arcs from a bb is implicit from the
120 data length. It enumerates the destination bb and per-arc flags.
121 There is one LINES record per basic block, it enumerates the source
122 lines which belong to that basic block. Source file names are
123 introduced by a line number of 0, following lines are from the new
124 source file. The initial source file for the function is NULL, but
125 the current source file should be remembered from one LINES record
126 to the next. The end of a block is indicated by an empty filename
127 - this does not reset the current source file. Note there is no
128 ordering of the ARCS and LINES records: they may be in any order,
129 interleaved in any manner. The current filename follows the order
130 the LINES records are stored in the file, *not* the ordering of the
131 blocks they are for.
133 The data file contains the following records.
134 data: {unit function-data* summary:object summary:program*}*
135 unit: header int32:checksum
136 function-data: announce_function arc_counts
137 announce_function: header int32:ident int32:checksum
138 arc_counts: header int64:count*
139 summary: int32:checksum {count-summary}GCOV_COUNTERS
140 count-summary: int32:num int32:runs int64:sum
141 int64:max int64:sum_max
143 The ANNOUNCE_FUNCTION record is the same as that in the note file,
144 but without the source location. The ARC_COUNTS gives the counter
145 values for those arcs that are instrumented. The SUMMARY records
146 give information about the whole object file and about the whole
147 program. The checksum is used for whole program summaries, and
148 disambiguates different programs which include the same
149 instrumented object file. There may be several program summaries,
150 each with a unique checksum. The object summary's checksum is zero.
151 Note that the data file might contain information from several runs
152 concatenated, or the data might be merged.
154 This file is included by both the compiler, gcov tools and the
155 runtime support library libgcov. IN_LIBGCOV and IN_GCOV are used to
156 distinguish which case is which. If IN_LIBGCOV is nonzero,
157 libgcov is being built. If IN_GCOV is nonzero, the gcov tools are
158 being built. Otherwise the compiler is being built. IN_GCOV may be
159 positive or negative. If positive, we are compiling a tool that
160 requires additional functions (see the code for knowledge of what
161 those functions are). */
163 #ifndef GCC_GCOV_IO_H
164 #define GCC_GCOV_IO_H
166 #if IN_LIBGCOV
167 /* About the target */
169 #if BITS_PER_UNIT == 8
170 typedef unsigned gcov_unsigned_t __attribute__ ((mode (SI)));
171 typedef unsigned gcov_position_t __attribute__ ((mode (SI)));
172 #if LONG_LONG_TYPE_SIZE > 32
173 typedef signed gcov_type __attribute__ ((mode (DI)));
174 #else
175 typedef signed gcov_type __attribute__ ((mode (SI)));
176 #endif
177 #else
178 #if BITS_PER_UNIT == 16
179 typedef unsigned gcov_unsigned_t __attribute__ ((mode (HI)));
180 typedef unsigned gcov_position_t __attribute__ ((mode (HI)));
181 #if LONG_LONG_TYPE_SIZE > 32
182 typedef signed gcov_type __attribute__ ((mode (SI)));
183 #else
184 typedef signed gcov_type __attribute__ ((mode (HI)));
185 #endif
186 #else
187 typedef unsigned gcov_unsigned_t __attribute__ ((mode (QI)));
188 typedef unsigned gcov_position_t __attribute__ ((mode (QI)));
189 #if LONG_LONG_TYPE_SIZE > 32
190 typedef signed gcov_type __attribute__ ((mode (HI)));
191 #else
192 typedef signed gcov_type __attribute__ ((mode (QI)));
193 #endif
194 #endif
195 #endif
198 #if defined (TARGET_POSIX_IO)
199 #define GCOV_LOCKED 1
200 #else
201 #define GCOV_LOCKED 0
202 #endif
204 #else /* !IN_LIBGCOV */
205 /* About the host */
207 typedef unsigned gcov_unsigned_t;
208 typedef unsigned gcov_position_t;
209 /* gcov_type is typedef'd elsewhere for the compiler */
210 #if IN_GCOV
211 #define GCOV_LINKAGE static
212 typedef HOST_WIDEST_INT gcov_type;
213 #if IN_GCOV > 0
214 #include <sys/types.h>
215 #endif
216 #else /*!IN_GCOV */
217 #define GCOV_TYPE_SIZE (LONG_LONG_TYPE_SIZE > 32 ? 64 : 32)
218 #endif
220 #if defined (HOST_HAS_F_SETLKW)
221 #define GCOV_LOCKED 1
222 #else
223 #define GCOV_LOCKED 0
224 #endif
226 #endif /* !IN_LIBGCOV */
228 /* In gcov we want function linkage to be static. In the compiler we want
229 it extern, so that they can be accessed from elsewhere. In libgcov we
230 need these functions to be extern, so prefix them with __gcov. In
231 libgcov they must also be hidden so that the instance in the executable
232 is not also used in a DSO. */
233 #if IN_LIBGCOV
235 #include "tconfig.h"
237 #define gcov_var __gcov_var
238 #define gcov_open __gcov_open
239 #define gcov_close __gcov_close
240 #define gcov_write_tag_length __gcov_write_tag_length
241 #define gcov_position __gcov_position
242 #define gcov_seek __gcov_seek
243 #define gcov_rewrite __gcov_rewrite
244 #define gcov_is_error __gcov_is_error
245 #define gcov_write_unsigned __gcov_write_unsigned
246 #define gcov_write_counter __gcov_write_counter
247 #define gcov_write_summary __gcov_write_summary
248 #define gcov_read_unsigned __gcov_read_unsigned
249 #define gcov_read_counter __gcov_read_counter
250 #define gcov_read_summary __gcov_read_summary
252 /* Poison these, so they don't accidentally slip in. */
253 #pragma GCC poison gcov_write_string gcov_write_tag gcov_write_length
254 #pragma GCC poison gcov_read_string gcov_sync gcov_time gcov_magic
256 #ifdef HAVE_GAS_HIDDEN
257 #define ATTRIBUTE_HIDDEN __attribute__ ((__visibility__ ("hidden")))
258 #else
259 #define ATTRIBUTE_HIDDEN
260 #endif
262 #else
264 #define ATTRIBUTE_HIDDEN
266 #endif
268 #ifndef GCOV_LINKAGE
269 #define GCOV_LINKAGE extern
270 #endif
272 /* File suffixes. */
273 #define GCOV_DATA_SUFFIX ".gcda"
274 #define GCOV_NOTE_SUFFIX ".gcno"
276 /* File magic. Must not be palindromes. */
277 #define GCOV_DATA_MAGIC ((gcov_unsigned_t)0x67636461) /* "gcda" */
278 #define GCOV_NOTE_MAGIC ((gcov_unsigned_t)0x67636e6f) /* "gcno" */
280 /* gcov-iov.h is automatically generated by the makefile from
281 version.c, it looks like
282 #define GCOV_VERSION ((gcov_unsigned_t)0x89abcdef)
284 #include "gcov-iov.h"
286 /* Convert a magic or version number to a 4 character string. */
287 #define GCOV_UNSIGNED2STRING(ARRAY,VALUE) \
288 ((ARRAY)[0] = (char)((VALUE) >> 24), \
289 (ARRAY)[1] = (char)((VALUE) >> 16), \
290 (ARRAY)[2] = (char)((VALUE) >> 8), \
291 (ARRAY)[3] = (char)((VALUE) >> 0))
293 /* The record tags. Values [1..3f] are for tags which may be in either
294 file. Values [41..9f] for those in the note file and [a1..ff] for
295 the data file. The tag value zero is used as an explicit end of
296 file marker -- it is not required to be present. */
298 #define GCOV_TAG_FUNCTION ((gcov_unsigned_t)0x01000000)
299 #define GCOV_TAG_FUNCTION_LENGTH (2)
300 #define GCOV_TAG_BLOCKS ((gcov_unsigned_t)0x01410000)
301 #define GCOV_TAG_BLOCKS_LENGTH(NUM) (NUM)
302 #define GCOV_TAG_BLOCKS_NUM(LENGTH) (LENGTH)
303 #define GCOV_TAG_ARCS ((gcov_unsigned_t)0x01430000)
304 #define GCOV_TAG_ARCS_LENGTH(NUM) (1 + (NUM) * 2)
305 #define GCOV_TAG_ARCS_NUM(LENGTH) (((LENGTH) - 1) / 2)
306 #define GCOV_TAG_LINES ((gcov_unsigned_t)0x01450000)
307 #define GCOV_TAG_COUNTER_BASE ((gcov_unsigned_t)0x01a10000)
308 #define GCOV_TAG_COUNTER_LENGTH(NUM) ((NUM) * 2)
309 #define GCOV_TAG_COUNTER_NUM(LENGTH) ((LENGTH) / 2)
310 #define GCOV_TAG_OBJECT_SUMMARY ((gcov_unsigned_t)0xa1000000)
311 #define GCOV_TAG_PROGRAM_SUMMARY ((gcov_unsigned_t)0xa3000000)
312 #define GCOV_TAG_SUMMARY_LENGTH \
313 (1 + GCOV_COUNTERS_SUMMABLE * (2 + 3 * 2))
315 /* Counters that are collected. */
316 #define GCOV_COUNTER_ARCS 0 /* Arc transitions. */
317 #define GCOV_COUNTERS_SUMMABLE 1 /* Counters which can be
318 summaried. */
319 #define GCOV_FIRST_VALUE_COUNTER 1 /* The first of counters used for value
320 profiling. They must form a consecutive
321 interval and their order must match
322 the order of HIST_TYPEs in
323 value-prof.h. */
324 #define GCOV_COUNTER_V_INTERVAL 1 /* Histogram of value inside an interval. */
325 #define GCOV_COUNTER_V_POW2 2 /* Histogram of exact power2 logarithm
326 of a value. */
327 #define GCOV_COUNTER_V_SINGLE 3 /* The most common value of expression. */
328 #define GCOV_COUNTER_V_DELTA 4 /* The most common difference between
329 consecutive values of expression. */
331 #define GCOV_COUNTER_V_INDIR 5 /* The most common indirect address */
332 #define GCOV_COUNTER_AVERAGE 6 /* Compute average value passed to the
333 counter. */
334 #define GCOV_COUNTER_IOR 7 /* IOR of the all values passed to
335 counter. */
336 #define GCOV_LAST_VALUE_COUNTER 7 /* The last of counters used for value
337 profiling. */
338 #define GCOV_COUNTERS 8
340 /* Number of counters used for value profiling. */
341 #define GCOV_N_VALUE_COUNTERS \
342 (GCOV_LAST_VALUE_COUNTER - GCOV_FIRST_VALUE_COUNTER + 1)
344 /* A list of human readable names of the counters */
345 #define GCOV_COUNTER_NAMES {"arcs", "interval", "pow2", "single", \
346 "delta","indirect_call", "average", "ior"}
348 /* Names of merge functions for counters. */
349 #define GCOV_MERGE_FUNCTIONS {"__gcov_merge_add", \
350 "__gcov_merge_add", \
351 "__gcov_merge_add", \
352 "__gcov_merge_single", \
353 "__gcov_merge_delta", \
354 "__gcov_merge_single", \
355 "__gcov_merge_add", \
356 "__gcov_merge_ior"}
358 /* Convert a counter index to a tag. */
359 #define GCOV_TAG_FOR_COUNTER(COUNT) \
360 (GCOV_TAG_COUNTER_BASE + ((gcov_unsigned_t)(COUNT) << 17))
361 /* Convert a tag to a counter. */
362 #define GCOV_COUNTER_FOR_TAG(TAG) \
363 ((unsigned)(((TAG) - GCOV_TAG_COUNTER_BASE) >> 17))
364 /* Check whether a tag is a counter tag. */
365 #define GCOV_TAG_IS_COUNTER(TAG) \
366 (!((TAG) & 0xFFFF) && GCOV_COUNTER_FOR_TAG (TAG) < GCOV_COUNTERS)
368 /* The tag level mask has 1's in the position of the inner levels, &
369 the lsb of the current level, and zero on the current and outer
370 levels. */
371 #define GCOV_TAG_MASK(TAG) (((TAG) - 1) ^ (TAG))
373 /* Return nonzero if SUB is an immediate subtag of TAG. */
374 #define GCOV_TAG_IS_SUBTAG(TAG,SUB) \
375 (GCOV_TAG_MASK (TAG) >> 8 == GCOV_TAG_MASK (SUB) \
376 && !(((SUB) ^ (TAG)) & ~GCOV_TAG_MASK(TAG)))
378 /* Return nonzero if SUB is at a sublevel to TAG. */
379 #define GCOV_TAG_IS_SUBLEVEL(TAG,SUB) \
380 (GCOV_TAG_MASK (TAG) > GCOV_TAG_MASK (SUB))
382 /* Basic block flags. */
383 #define GCOV_BLOCK_UNEXPECTED (1 << 1)
385 /* Arc flags. */
386 #define GCOV_ARC_ON_TREE (1 << 0)
387 #define GCOV_ARC_FAKE (1 << 1)
388 #define GCOV_ARC_FALLTHROUGH (1 << 2)
390 /* Structured records. */
392 /* Cumulative counter data. */
393 struct gcov_ctr_summary
395 gcov_unsigned_t num; /* number of counters. */
396 gcov_unsigned_t runs; /* number of program runs */
397 gcov_type sum_all; /* sum of all counters accumulated. */
398 gcov_type run_max; /* maximum value on a single run. */
399 gcov_type sum_max; /* sum of individual run max values. */
402 /* Object & program summary record. */
403 struct gcov_summary
405 gcov_unsigned_t checksum; /* checksum of program */
406 struct gcov_ctr_summary ctrs[GCOV_COUNTERS_SUMMABLE];
409 /* Structures embedded in coveraged program. The structures generated
410 by write_profile must match these. */
412 #if IN_LIBGCOV
413 /* Information about a single function. This uses the trailing array
414 idiom. The number of counters is determined from the counter_mask
415 in gcov_info. We hold an array of function info, so have to
416 explicitly calculate the correct array stride. */
417 struct gcov_fn_info
419 gcov_unsigned_t ident; /* unique ident of function */
420 gcov_unsigned_t checksum; /* function checksum */
421 unsigned n_ctrs[0]; /* instrumented counters */
424 /* Type of function used to merge counters. */
425 typedef void (*gcov_merge_fn) (gcov_type *, gcov_unsigned_t);
427 /* Information about counters. */
428 struct gcov_ctr_info
430 gcov_unsigned_t num; /* number of counters. */
431 gcov_type *values; /* their values. */
432 gcov_merge_fn merge; /* The function used to merge them. */
435 /* Information about a single object file. */
436 struct gcov_info
438 gcov_unsigned_t version; /* expected version number */
439 struct gcov_info *next; /* link to next, used by libgcov */
441 gcov_unsigned_t stamp; /* uniquifying time stamp */
442 const char *filename; /* output file name */
444 unsigned n_functions; /* number of functions */
445 const struct gcov_fn_info *functions; /* table of functions */
447 unsigned ctr_mask; /* mask of counters instrumented. */
448 struct gcov_ctr_info counts[0]; /* count data. The number of bits
449 set in the ctr_mask field
450 determines how big this array
451 is. */
454 /* Register a new object file module. */
455 extern void __gcov_init (struct gcov_info *) ATTRIBUTE_HIDDEN;
457 /* Called before fork, to avoid double counting. */
458 extern void __gcov_flush (void) ATTRIBUTE_HIDDEN;
460 /* The merge function that just sums the counters. */
461 extern void __gcov_merge_add (gcov_type *, unsigned) ATTRIBUTE_HIDDEN;
463 /* The merge function to choose the most common value. */
464 extern void __gcov_merge_single (gcov_type *, unsigned) ATTRIBUTE_HIDDEN;
466 /* The merge function to choose the most common difference between
467 consecutive values. */
468 extern void __gcov_merge_delta (gcov_type *, unsigned) ATTRIBUTE_HIDDEN;
470 /* The profiler functions. */
471 extern void __gcov_interval_profiler (gcov_type *, gcov_type, int, unsigned);
472 extern void __gcov_pow2_profiler (gcov_type *, gcov_type);
473 extern void __gcov_one_value_profiler (gcov_type *, gcov_type);
474 extern void __gcov_indirect_call_profiler (gcov_type *, gcov_type, void *, void *);
475 extern void __gcov_average_profiler (gcov_type *, gcov_type);
476 extern void __gcov_ior_profiler (gcov_type *, gcov_type);
477 extern void __gcov_merge_ior (gcov_type *, unsigned);
479 #ifndef inhibit_libc
480 /* The wrappers around some library functions.. */
481 extern pid_t __gcov_fork (void);
482 extern int __gcov_execl (const char *, const char *, ...) ATTRIBUTE_HIDDEN;
483 extern int __gcov_execlp (const char *, const char *, ...) ATTRIBUTE_HIDDEN;
484 extern int __gcov_execle (const char *, const 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
491 #endif /* IN_LIBGCOV */
493 #if IN_LIBGCOV >= 0
495 /* Optimum number of gcov_unsigned_t's read from or written to disk. */
496 #define GCOV_BLOCK_SIZE (1 << 10)
498 GCOV_LINKAGE struct gcov_var
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;
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;
539 /* Available everywhere. */
540 static gcov_position_t gcov_position (void);
541 static int gcov_is_error (void);
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;
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
564 #if !IN_GCOV
565 /* Available outside gcov */
566 GCOV_LINKAGE void gcov_write_unsigned (gcov_unsigned_t) ATTRIBUTE_HIDDEN;
567 #endif
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
576 #if IN_GCOV > 0
577 /* Available in gcov */
578 GCOV_LINKAGE time_t gcov_time (void);
579 #endif
581 /* Save the current position in the gcov file. */
583 static inline gcov_position_t
584 gcov_position (void)
586 gcc_assert (gcov_var.mode > 0);
587 return gcov_var.start + gcov_var.offset;
590 /* Return nonzero if the error flag is set. */
592 static inline int
593 gcov_is_error (void)
595 return gcov_var.file ? gcov_var.error : 1;
598 #if IN_LIBGCOV
599 /* Move to beginning of file and initialize for writing. */
601 static inline void
602 gcov_rewrite (void)
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);
610 #endif
612 #endif /* IN_LIBGCOV >= 0 */
614 #endif /* GCC_GCOV_IO_H */