re PR testsuite/40567 (Revision 149002 caused many failures)
[official-gcc.git] / gcc / gcov-io.c
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1 /* File format for coverage information
2 Copyright (C) 1996, 1997, 1998, 2000, 2002, 2003, 2004, 2005, 2007,
3 2008 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 3, 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 COPYING3. If not see
21 <http://www.gnu.org/licenses/>. */
23 /* Routines declared in gcov-io.h. This file should be #included by
24 another source file, after having #included gcov-io.h. */
26 #if !IN_GCOV
27 static void gcov_write_block (unsigned);
28 static gcov_unsigned_t *gcov_write_words (unsigned);
29 #endif
30 static const gcov_unsigned_t *gcov_read_words (unsigned);
31 #if !IN_LIBGCOV
32 static void gcov_allocate (unsigned);
33 #endif
35 static inline gcov_unsigned_t from_file (gcov_unsigned_t value)
37 #if !IN_LIBGCOV
38 if (gcov_var.endian)
40 value = (value >> 16) | (value << 16);
41 value = ((value & 0xff00ff) << 8) | ((value >> 8) & 0xff00ff);
43 #endif
44 return value;
47 /* Open a gcov file. NAME is the name of the file to open and MODE
48 indicates whether a new file should be created, or an existing file
49 opened for modification. If MODE is >= 0 an existing file will be
50 opened, if possible, and if MODE is <= 0, a new file will be
51 created. Use MODE=0 to attempt to reopen an existing file and then
52 fall back on creating a new one. Return zero on failure, >0 on
53 opening an existing file and <0 on creating a new one. */
55 GCOV_LINKAGE int
56 #if IN_LIBGCOV
57 gcov_open (const char *name)
58 #else
59 gcov_open (const char *name, int mode)
60 #endif
62 #if IN_LIBGCOV
63 const int mode = 0;
64 #endif
65 #if GCOV_LOCKED
66 struct flock s_flock;
67 int fd;
69 s_flock.l_type = F_WRLCK;
70 s_flock.l_whence = SEEK_SET;
71 s_flock.l_start = 0;
72 s_flock.l_len = 0; /* Until EOF. */
73 s_flock.l_pid = getpid ();
74 #endif
76 gcc_assert (!gcov_var.file);
77 gcov_var.start = 0;
78 gcov_var.offset = gcov_var.length = 0;
79 gcov_var.overread = -1u;
80 gcov_var.error = 0;
81 #if !IN_LIBGCOV
82 gcov_var.endian = 0;
83 #endif
84 #if GCOV_LOCKED
85 if (mode > 0)
86 fd = open (name, O_RDWR);
87 else
88 fd = open (name, O_RDWR | O_CREAT, 0666);
89 if (fd < 0)
90 return 0;
92 while (fcntl (fd, F_SETLKW, &s_flock) && errno == EINTR)
93 continue;
95 gcov_var.file = fdopen (fd, "r+b");
96 if (!gcov_var.file)
98 close (fd);
99 return 0;
102 if (mode > 0)
103 gcov_var.mode = 1;
104 else if (mode == 0)
106 struct stat st;
108 if (fstat (fd, &st) < 0)
110 fclose (gcov_var.file);
111 gcov_var.file = 0;
112 return 0;
114 if (st.st_size != 0)
115 gcov_var.mode = 1;
116 else
117 gcov_var.mode = mode * 2 + 1;
119 else
120 gcov_var.mode = mode * 2 + 1;
121 #else
122 if (mode >= 0)
123 gcov_var.file = fopen (name, "r+b");
124 if (gcov_var.file)
125 gcov_var.mode = 1;
126 else if (mode <= 0)
128 gcov_var.file = fopen (name, "w+b");
129 if (gcov_var.file)
130 gcov_var.mode = mode * 2 + 1;
132 if (!gcov_var.file)
133 return 0;
134 #endif
136 setbuf (gcov_var.file, (char *)0);
138 return 1;
141 /* Close the current gcov file. Flushes data to disk. Returns nonzero
142 on failure or error flag set. */
144 GCOV_LINKAGE int
145 gcov_close (void)
147 if (gcov_var.file)
149 #if !IN_GCOV
150 if (gcov_var.offset && gcov_var.mode < 0)
151 gcov_write_block (gcov_var.offset);
152 #endif
153 fclose (gcov_var.file);
154 gcov_var.file = 0;
155 gcov_var.length = 0;
157 #if !IN_LIBGCOV
158 free (gcov_var.buffer);
159 gcov_var.alloc = 0;
160 gcov_var.buffer = 0;
161 #endif
162 gcov_var.mode = 0;
163 return gcov_var.error;
166 #if !IN_LIBGCOV
167 /* Check if MAGIC is EXPECTED. Use it to determine endianness of the
168 file. Returns +1 for same endian, -1 for other endian and zero for
169 not EXPECTED. */
171 GCOV_LINKAGE int
172 gcov_magic (gcov_unsigned_t magic, gcov_unsigned_t expected)
174 if (magic == expected)
175 return 1;
176 magic = (magic >> 16) | (magic << 16);
177 magic = ((magic & 0xff00ff) << 8) | ((magic >> 8) & 0xff00ff);
178 if (magic == expected)
180 gcov_var.endian = 1;
181 return -1;
183 return 0;
185 #endif
187 #if !IN_LIBGCOV
188 static void
189 gcov_allocate (unsigned length)
191 size_t new_size = gcov_var.alloc;
193 if (!new_size)
194 new_size = GCOV_BLOCK_SIZE;
195 new_size += length;
196 new_size *= 2;
198 gcov_var.alloc = new_size;
199 gcov_var.buffer = XRESIZEVAR (gcov_unsigned_t, gcov_var.buffer, new_size << 2);
201 #endif
203 #if !IN_GCOV
204 /* Write out the current block, if needs be. */
206 static void
207 gcov_write_block (unsigned size)
209 if (fwrite (gcov_var.buffer, size << 2, 1, gcov_var.file) != 1)
210 gcov_var.error = 1;
211 gcov_var.start += size;
212 gcov_var.offset -= size;
215 /* Allocate space to write BYTES bytes to the gcov file. Return a
216 pointer to those bytes, or NULL on failure. */
218 static gcov_unsigned_t *
219 gcov_write_words (unsigned words)
221 gcov_unsigned_t *result;
223 gcc_assert (gcov_var.mode < 0);
224 #if IN_LIBGCOV
225 if (gcov_var.offset >= GCOV_BLOCK_SIZE)
227 gcov_write_block (GCOV_BLOCK_SIZE);
228 if (gcov_var.offset)
230 gcc_assert (gcov_var.offset == 1);
231 memcpy (gcov_var.buffer, gcov_var.buffer + GCOV_BLOCK_SIZE, 4);
234 #else
235 if (gcov_var.offset + words > gcov_var.alloc)
236 gcov_allocate (gcov_var.offset + words);
237 #endif
238 result = &gcov_var.buffer[gcov_var.offset];
239 gcov_var.offset += words;
241 return result;
244 /* Write unsigned VALUE to coverage file. Sets error flag
245 appropriately. */
247 GCOV_LINKAGE void
248 gcov_write_unsigned (gcov_unsigned_t value)
250 gcov_unsigned_t *buffer = gcov_write_words (1);
252 buffer[0] = value;
255 /* Write counter VALUE to coverage file. Sets error flag
256 appropriately. */
258 #if IN_LIBGCOV
259 GCOV_LINKAGE void
260 gcov_write_counter (gcov_type value)
262 gcov_unsigned_t *buffer = gcov_write_words (2);
264 buffer[0] = (gcov_unsigned_t) value;
265 if (sizeof (value) > sizeof (gcov_unsigned_t))
266 buffer[1] = (gcov_unsigned_t) (value >> 32);
267 else
268 buffer[1] = 0;
270 #endif /* IN_LIBGCOV */
272 #if !IN_LIBGCOV
273 /* Write STRING to coverage file. Sets error flag on file
274 error, overflow flag on overflow */
276 GCOV_LINKAGE void
277 gcov_write_string (const char *string)
279 unsigned length = 0;
280 unsigned alloc = 0;
281 gcov_unsigned_t *buffer;
283 if (string)
285 length = strlen (string);
286 alloc = (length + 4) >> 2;
289 buffer = gcov_write_words (1 + alloc);
291 buffer[0] = alloc;
292 buffer[alloc] = 0;
293 memcpy (&buffer[1], string, length);
295 #endif
297 #if !IN_LIBGCOV
298 /* Write a tag TAG and reserve space for the record length. Return a
299 value to be used for gcov_write_length. */
301 GCOV_LINKAGE gcov_position_t
302 gcov_write_tag (gcov_unsigned_t tag)
304 gcov_position_t result = gcov_var.start + gcov_var.offset;
305 gcov_unsigned_t *buffer = gcov_write_words (2);
307 buffer[0] = tag;
308 buffer[1] = 0;
310 return result;
313 /* Write a record length using POSITION, which was returned by
314 gcov_write_tag. The current file position is the end of the
315 record, and is restored before returning. Returns nonzero on
316 overflow. */
318 GCOV_LINKAGE void
319 gcov_write_length (gcov_position_t position)
321 unsigned offset;
322 gcov_unsigned_t length;
323 gcov_unsigned_t *buffer;
325 gcc_assert (gcov_var.mode < 0);
326 gcc_assert (position + 2 <= gcov_var.start + gcov_var.offset);
327 gcc_assert (position >= gcov_var.start);
328 offset = position - gcov_var.start;
329 length = gcov_var.offset - offset - 2;
330 buffer = (gcov_unsigned_t *) &gcov_var.buffer[offset];
331 buffer[1] = length;
332 if (gcov_var.offset >= GCOV_BLOCK_SIZE)
333 gcov_write_block (gcov_var.offset);
336 #else /* IN_LIBGCOV */
338 /* Write a tag TAG and length LENGTH. */
340 GCOV_LINKAGE void
341 gcov_write_tag_length (gcov_unsigned_t tag, gcov_unsigned_t length)
343 gcov_unsigned_t *buffer = gcov_write_words (2);
345 buffer[0] = tag;
346 buffer[1] = length;
349 /* Write a summary structure to the gcov file. Return nonzero on
350 overflow. */
352 GCOV_LINKAGE void
353 gcov_write_summary (gcov_unsigned_t tag, const struct gcov_summary *summary)
355 unsigned ix;
356 const struct gcov_ctr_summary *csum;
358 gcov_write_tag_length (tag, GCOV_TAG_SUMMARY_LENGTH);
359 gcov_write_unsigned (summary->checksum);
360 for (csum = summary->ctrs, ix = GCOV_COUNTERS_SUMMABLE; ix--; csum++)
362 gcov_write_unsigned (csum->num);
363 gcov_write_unsigned (csum->runs);
364 gcov_write_counter (csum->sum_all);
365 gcov_write_counter (csum->run_max);
366 gcov_write_counter (csum->sum_max);
369 #endif /* IN_LIBGCOV */
371 #endif /*!IN_GCOV */
373 /* Return a pointer to read BYTES bytes from the gcov file. Returns
374 NULL on failure (read past EOF). */
376 static const gcov_unsigned_t *
377 gcov_read_words (unsigned words)
379 const gcov_unsigned_t *result;
380 unsigned excess = gcov_var.length - gcov_var.offset;
382 gcc_assert (gcov_var.mode > 0);
383 if (excess < words)
385 gcov_var.start += gcov_var.offset;
386 #if IN_LIBGCOV
387 if (excess)
389 gcc_assert (excess == 1);
390 memcpy (gcov_var.buffer, gcov_var.buffer + gcov_var.offset, 4);
392 #else
393 memmove (gcov_var.buffer, gcov_var.buffer + gcov_var.offset, excess * 4);
394 #endif
395 gcov_var.offset = 0;
396 gcov_var.length = excess;
397 #if IN_LIBGCOV
398 gcc_assert (!gcov_var.length || gcov_var.length == 1);
399 excess = GCOV_BLOCK_SIZE;
400 #else
401 if (gcov_var.length + words > gcov_var.alloc)
402 gcov_allocate (gcov_var.length + words);
403 excess = gcov_var.alloc - gcov_var.length;
404 #endif
405 excess = fread (gcov_var.buffer + gcov_var.length,
406 1, excess << 2, gcov_var.file) >> 2;
407 gcov_var.length += excess;
408 if (gcov_var.length < words)
410 gcov_var.overread += words - gcov_var.length;
411 gcov_var.length = 0;
412 return 0;
415 result = &gcov_var.buffer[gcov_var.offset];
416 gcov_var.offset += words;
417 return result;
420 /* Read unsigned value from a coverage file. Sets error flag on file
421 error, overflow flag on overflow */
423 GCOV_LINKAGE gcov_unsigned_t
424 gcov_read_unsigned (void)
426 gcov_unsigned_t value;
427 const gcov_unsigned_t *buffer = gcov_read_words (1);
429 if (!buffer)
430 return 0;
431 value = from_file (buffer[0]);
432 return value;
435 /* Read counter value from a coverage file. Sets error flag on file
436 error, overflow flag on overflow */
438 GCOV_LINKAGE gcov_type
439 gcov_read_counter (void)
441 gcov_type value;
442 const gcov_unsigned_t *buffer = gcov_read_words (2);
444 if (!buffer)
445 return 0;
446 value = from_file (buffer[0]);
447 if (sizeof (value) > sizeof (gcov_unsigned_t))
448 value |= ((gcov_type) from_file (buffer[1])) << 32;
449 else if (buffer[1])
450 gcov_var.error = -1;
452 return value;
455 /* Read string from coverage file. Returns a pointer to a static
456 buffer, or NULL on empty string. You must copy the string before
457 calling another gcov function. */
459 #if !IN_LIBGCOV
460 GCOV_LINKAGE const char *
461 gcov_read_string (void)
463 unsigned length = gcov_read_unsigned ();
465 if (!length)
466 return 0;
468 return (const char *) gcov_read_words (length);
470 #endif
472 GCOV_LINKAGE void
473 gcov_read_summary (struct gcov_summary *summary)
475 unsigned ix;
476 struct gcov_ctr_summary *csum;
478 summary->checksum = gcov_read_unsigned ();
479 for (csum = summary->ctrs, ix = GCOV_COUNTERS_SUMMABLE; ix--; csum++)
481 csum->num = gcov_read_unsigned ();
482 csum->runs = gcov_read_unsigned ();
483 csum->sum_all = gcov_read_counter ();
484 csum->run_max = gcov_read_counter ();
485 csum->sum_max = gcov_read_counter ();
489 #if !IN_LIBGCOV
490 /* Reset to a known position. BASE should have been obtained from
491 gcov_position, LENGTH should be a record length. */
493 GCOV_LINKAGE void
494 gcov_sync (gcov_position_t base, gcov_unsigned_t length)
496 gcc_assert (gcov_var.mode > 0);
497 base += length;
498 if (base - gcov_var.start <= gcov_var.length)
499 gcov_var.offset = base - gcov_var.start;
500 else
502 gcov_var.offset = gcov_var.length = 0;
503 fseek (gcov_var.file, base << 2, SEEK_SET);
504 gcov_var.start = ftell (gcov_var.file) >> 2;
507 #endif
509 #if IN_LIBGCOV
510 /* Move to a given position in a gcov file. */
512 GCOV_LINKAGE void
513 gcov_seek (gcov_position_t base)
515 gcc_assert (gcov_var.mode < 0);
516 if (gcov_var.offset)
517 gcov_write_block (gcov_var.offset);
518 fseek (gcov_var.file, base << 2, SEEK_SET);
519 gcov_var.start = ftell (gcov_var.file) >> 2;
521 #endif
523 #if IN_GCOV > 0
524 /* Return the modification time of the current gcov file. */
526 GCOV_LINKAGE time_t
527 gcov_time (void)
529 struct stat status;
531 if (fstat (fileno (gcov_var.file), &status))
532 return 0;
533 else
534 return status.st_mtime;
536 #endif /* IN_GCOV */