]>
Commit | Line | Data |
---|---|---|
d6d3f033 RX |
1 | /* Routines required for instrumenting a program. */ |
2 | /* Compile this one with gcc. */ | |
ac1dca3c | 3 | /* Copyright (C) 1989-2014 Free Software Foundation, Inc. |
d6d3f033 RX |
4 | |
5 | This file is part of GCC. | |
6 | ||
7 | GCC is free software; you can redistribute it and/or modify it under | |
8 | the terms of the GNU General Public License as published by the Free | |
9 | Software Foundation; either version 3, or (at your option) any later | |
10 | version. | |
11 | ||
12 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
13 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
14 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
15 | for more details. | |
16 | ||
17 | Under Section 7 of GPL version 3, you are granted additional | |
18 | permissions described in the GCC Runtime Library Exception, version | |
19 | 3.1, as published by the Free Software Foundation. | |
20 | ||
21 | You should have received a copy of the GNU General Public License and | |
22 | a copy of the GCC Runtime Library Exception along with this program; | |
23 | see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
24 | <http://www.gnu.org/licenses/>. */ | |
25 | ||
40d6b753 | 26 | #include "libgcov.h" |
d6d3f033 RX |
27 | |
28 | #if defined(inhibit_libc) | |
29 | /* If libc and its header files are not available, provide dummy functions. */ | |
30 | ||
31 | #if defined(L_gcov) | |
32 | void __gcov_init (struct gcov_info *p __attribute__ ((unused))) {} | |
33 | #endif | |
34 | ||
35 | #else /* inhibit_libc */ | |
36 | ||
37 | #include <string.h> | |
38 | #if GCOV_LOCKED | |
39 | #include <fcntl.h> | |
40 | #include <errno.h> | |
41 | #include <sys/stat.h> | |
42 | #endif | |
43 | ||
44 | #ifdef L_gcov | |
e3f0315f TJ |
45 | |
46 | /* A utility function for outputing errors. */ | |
47 | static int gcov_error (const char *, ...); | |
48 | ||
d6d3f033 RX |
49 | #include "gcov-io.c" |
50 | ||
51 | /* The following functions can be called from outside of this file. */ | |
52 | extern void gcov_clear (void) ATTRIBUTE_HIDDEN; | |
53 | extern void gcov_exit (void) ATTRIBUTE_HIDDEN; | |
54 | extern void set_gcov_dump_complete (void) ATTRIBUTE_HIDDEN; | |
55 | extern void reset_gcov_dump_complete (void) ATTRIBUTE_HIDDEN; | |
56 | extern int get_gcov_dump_complete (void) ATTRIBUTE_HIDDEN; | |
57 | extern void set_gcov_list (struct gcov_info *) ATTRIBUTE_HIDDEN; | |
58 | ||
59 | struct gcov_fn_buffer | |
60 | { | |
61 | struct gcov_fn_buffer *next; | |
62 | unsigned fn_ix; | |
63 | struct gcov_fn_info info; | |
64 | /* note gcov_fn_info ends in a trailing array. */ | |
65 | }; | |
66 | ||
67 | struct gcov_summary_buffer | |
68 | { | |
69 | struct gcov_summary_buffer *next; | |
70 | struct gcov_summary summary; | |
71 | }; | |
72 | ||
73 | /* Chain of per-object gcov structures. */ | |
74 | static struct gcov_info *gcov_list; | |
75 | ||
76 | /* Set the head of gcov_list. */ | |
77 | void | |
78 | set_gcov_list (struct gcov_info *head) | |
79 | { | |
80 | gcov_list = head; | |
81 | } | |
82 | ||
83 | /* Size of the longest file name. */ | |
c77556a5 RX |
84 | /* We need to expose this static variable when compiling for gcov-tool. */ |
85 | #ifndef IN_GCOV_TOOL | |
86 | static | |
87 | #endif | |
88 | size_t gcov_max_filename = 0; | |
d6d3f033 RX |
89 | |
90 | /* Flag when the profile has already been dumped via __gcov_dump(). */ | |
91 | static int gcov_dump_complete; | |
92 | ||
867c8b03 | 93 | /* A global function that get the vaule of gcov_dump_complete. */ |
d6d3f033 RX |
94 | |
95 | int | |
96 | get_gcov_dump_complete (void) | |
97 | { | |
98 | return gcov_dump_complete; | |
99 | } | |
100 | ||
101 | /* A global functino that set the vaule of gcov_dump_complete. Will | |
102 | be used in __gcov_dump() in libgcov-interface.c. */ | |
103 | ||
104 | void | |
105 | set_gcov_dump_complete (void) | |
106 | { | |
107 | gcov_dump_complete = 1; | |
108 | } | |
109 | ||
110 | /* A global functino that set the vaule of gcov_dump_complete. Will | |
111 | be used in __gcov_reset() in libgcov-interface.c. */ | |
112 | ||
113 | void | |
114 | reset_gcov_dump_complete (void) | |
115 | { | |
116 | gcov_dump_complete = 0; | |
117 | } | |
118 | ||
d6d3f033 RX |
119 | static struct gcov_fn_buffer * |
120 | free_fn_data (const struct gcov_info *gi_ptr, struct gcov_fn_buffer *buffer, | |
121 | unsigned limit) | |
122 | { | |
123 | struct gcov_fn_buffer *next; | |
124 | unsigned ix, n_ctr = 0; | |
125 | ||
126 | if (!buffer) | |
127 | return 0; | |
128 | next = buffer->next; | |
129 | ||
130 | for (ix = 0; ix != limit; ix++) | |
131 | if (gi_ptr->merge[ix]) | |
132 | free (buffer->info.ctrs[n_ctr++].values); | |
133 | free (buffer); | |
134 | return next; | |
135 | } | |
136 | ||
137 | static struct gcov_fn_buffer ** | |
138 | buffer_fn_data (const char *filename, const struct gcov_info *gi_ptr, | |
139 | struct gcov_fn_buffer **end_ptr, unsigned fn_ix) | |
140 | { | |
141 | unsigned n_ctrs = 0, ix = 0; | |
142 | struct gcov_fn_buffer *fn_buffer; | |
143 | unsigned len; | |
144 | ||
145 | for (ix = GCOV_COUNTERS; ix--;) | |
146 | if (gi_ptr->merge[ix]) | |
147 | n_ctrs++; | |
148 | ||
149 | len = sizeof (*fn_buffer) + sizeof (fn_buffer->info.ctrs[0]) * n_ctrs; | |
40d6b753 | 150 | fn_buffer = (struct gcov_fn_buffer *) xmalloc (len); |
d6d3f033 RX |
151 | |
152 | if (!fn_buffer) | |
153 | goto fail; | |
154 | ||
155 | fn_buffer->next = 0; | |
156 | fn_buffer->fn_ix = fn_ix; | |
157 | fn_buffer->info.ident = gcov_read_unsigned (); | |
158 | fn_buffer->info.lineno_checksum = gcov_read_unsigned (); | |
159 | fn_buffer->info.cfg_checksum = gcov_read_unsigned (); | |
160 | ||
161 | for (n_ctrs = ix = 0; ix != GCOV_COUNTERS; ix++) | |
162 | { | |
163 | gcov_unsigned_t length; | |
164 | gcov_type *values; | |
165 | ||
166 | if (!gi_ptr->merge[ix]) | |
167 | continue; | |
168 | ||
169 | if (gcov_read_unsigned () != GCOV_TAG_FOR_COUNTER (ix)) | |
170 | { | |
171 | len = 0; | |
172 | goto fail; | |
173 | } | |
174 | ||
175 | length = GCOV_TAG_COUNTER_NUM (gcov_read_unsigned ()); | |
176 | len = length * sizeof (gcov_type); | |
40d6b753 | 177 | values = (gcov_type *) xmalloc (len); |
d6d3f033 RX |
178 | if (!values) |
179 | goto fail; | |
180 | ||
181 | fn_buffer->info.ctrs[n_ctrs].num = length; | |
182 | fn_buffer->info.ctrs[n_ctrs].values = values; | |
183 | ||
184 | while (length--) | |
185 | *values++ = gcov_read_counter (); | |
186 | n_ctrs++; | |
187 | } | |
188 | ||
189 | *end_ptr = fn_buffer; | |
190 | return &fn_buffer->next; | |
191 | ||
192 | fail: | |
193 | gcov_error ("profiling:%s:Function %u %s %u \n", filename, fn_ix, | |
194 | len ? "cannot allocate" : "counter mismatch", len ? len : ix); | |
195 | ||
196 | return (struct gcov_fn_buffer **)free_fn_data (gi_ptr, fn_buffer, ix); | |
197 | } | |
198 | ||
199 | /* Add an unsigned value to the current crc */ | |
200 | ||
201 | static gcov_unsigned_t | |
202 | crc32_unsigned (gcov_unsigned_t crc32, gcov_unsigned_t value) | |
203 | { | |
204 | unsigned ix; | |
205 | ||
206 | for (ix = 32; ix--; value <<= 1) | |
207 | { | |
208 | unsigned feedback; | |
209 | ||
210 | feedback = (value ^ crc32) & 0x80000000 ? 0x04c11db7 : 0; | |
211 | crc32 <<= 1; | |
212 | crc32 ^= feedback; | |
213 | } | |
214 | ||
215 | return crc32; | |
216 | } | |
217 | ||
218 | /* Check if VERSION of the info block PTR matches libgcov one. | |
219 | Return 1 on success, or zero in case of versions mismatch. | |
220 | If FILENAME is not NULL, its value used for reporting purposes | |
221 | instead of value from the info block. */ | |
222 | ||
223 | static int | |
224 | gcov_version (struct gcov_info *ptr, gcov_unsigned_t version, | |
225 | const char *filename) | |
226 | { | |
227 | if (version != GCOV_VERSION) | |
228 | { | |
229 | char v[4], e[4]; | |
230 | ||
231 | GCOV_UNSIGNED2STRING (v, version); | |
232 | GCOV_UNSIGNED2STRING (e, GCOV_VERSION); | |
233 | ||
234 | gcov_error ("profiling:%s:Version mismatch - expected %.4s got %.4s\n", | |
235 | filename? filename : ptr->filename, e, v); | |
236 | return 0; | |
237 | } | |
238 | return 1; | |
239 | } | |
240 | ||
241 | /* Insert counter VALUE into HISTOGRAM. */ | |
242 | ||
243 | static void | |
244 | gcov_histogram_insert(gcov_bucket_type *histogram, gcov_type value) | |
245 | { | |
246 | unsigned i; | |
247 | ||
248 | i = gcov_histo_index(value); | |
249 | histogram[i].num_counters++; | |
250 | histogram[i].cum_value += value; | |
251 | if (value < histogram[i].min_value) | |
252 | histogram[i].min_value = value; | |
253 | } | |
254 | ||
255 | /* Computes a histogram of the arc counters to place in the summary SUM. */ | |
256 | ||
257 | static void | |
258 | gcov_compute_histogram (struct gcov_summary *sum) | |
259 | { | |
260 | struct gcov_info *gi_ptr; | |
261 | const struct gcov_fn_info *gfi_ptr; | |
262 | const struct gcov_ctr_info *ci_ptr; | |
263 | struct gcov_ctr_summary *cs_ptr; | |
264 | unsigned t_ix, f_ix, ctr_info_ix, ix; | |
265 | int h_ix; | |
266 | ||
267 | /* This currently only applies to arc counters. */ | |
268 | t_ix = GCOV_COUNTER_ARCS; | |
269 | ||
270 | /* First check if there are any counts recorded for this counter. */ | |
271 | cs_ptr = &(sum->ctrs[t_ix]); | |
272 | if (!cs_ptr->num) | |
273 | return; | |
274 | ||
275 | for (h_ix = 0; h_ix < GCOV_HISTOGRAM_SIZE; h_ix++) | |
276 | { | |
277 | cs_ptr->histogram[h_ix].num_counters = 0; | |
278 | cs_ptr->histogram[h_ix].min_value = cs_ptr->run_max; | |
279 | cs_ptr->histogram[h_ix].cum_value = 0; | |
280 | } | |
281 | ||
282 | /* Walk through all the per-object structures and record each of | |
283 | the count values in histogram. */ | |
284 | for (gi_ptr = gcov_list; gi_ptr; gi_ptr = gi_ptr->next) | |
285 | { | |
286 | if (!gi_ptr->merge[t_ix]) | |
287 | continue; | |
288 | ||
289 | /* Find the appropriate index into the gcov_ctr_info array | |
290 | for the counter we are currently working on based on the | |
291 | existence of the merge function pointer for this object. */ | |
292 | for (ix = 0, ctr_info_ix = 0; ix < t_ix; ix++) | |
293 | { | |
294 | if (gi_ptr->merge[ix]) | |
295 | ctr_info_ix++; | |
296 | } | |
297 | for (f_ix = 0; f_ix != gi_ptr->n_functions; f_ix++) | |
298 | { | |
299 | gfi_ptr = gi_ptr->functions[f_ix]; | |
300 | ||
301 | if (!gfi_ptr || gfi_ptr->key != gi_ptr) | |
302 | continue; | |
303 | ||
304 | ci_ptr = &gfi_ptr->ctrs[ctr_info_ix]; | |
305 | for (ix = 0; ix < ci_ptr->num; ix++) | |
306 | gcov_histogram_insert (cs_ptr->histogram, ci_ptr->values[ix]); | |
307 | } | |
308 | } | |
309 | } | |
310 | ||
d6d3f033 RX |
311 | /* gcda filename. */ |
312 | static char *gi_filename; | |
313 | /* buffer for the fn_data from another program. */ | |
314 | static struct gcov_fn_buffer *fn_buffer; | |
315 | /* buffer for summary from other programs to be written out. */ | |
316 | static struct gcov_summary_buffer *sum_buffer; | |
7f369373 JH |
317 | /* If application calls fork or exec multiple times, we end up storing |
318 | profile repeadely. We should not account this as multiple runs or | |
319 | functions executed once may mistakely become cold. */ | |
320 | static int run_accounted = 0; | |
d6d3f033 RX |
321 | |
322 | /* This funtions computes the program level summary and the histo-gram. | |
2c973ee7 | 323 | It computes and returns CRC32 and stored summary in THIS_PRG. */ |
d6d3f033 | 324 | |
867c8b03 | 325 | static gcov_unsigned_t |
2c973ee7 | 326 | gcov_exit_compute_summary (struct gcov_summary *this_prg) |
d6d3f033 RX |
327 | { |
328 | struct gcov_info *gi_ptr; | |
329 | const struct gcov_fn_info *gfi_ptr; | |
330 | struct gcov_ctr_summary *cs_ptr; | |
331 | const struct gcov_ctr_info *ci_ptr; | |
332 | int f_ix; | |
333 | unsigned t_ix; | |
334 | gcov_unsigned_t c_num; | |
867c8b03 | 335 | gcov_unsigned_t crc32 = 0; |
d6d3f033 | 336 | |
d6d3f033 | 337 | /* Find the totals for this execution. */ |
2c973ee7 | 338 | memset (this_prg, 0, sizeof (*this_prg)); |
d6d3f033 RX |
339 | for (gi_ptr = gcov_list; gi_ptr; gi_ptr = gi_ptr->next) |
340 | { | |
341 | crc32 = crc32_unsigned (crc32, gi_ptr->stamp); | |
342 | crc32 = crc32_unsigned (crc32, gi_ptr->n_functions); | |
343 | ||
344 | for (f_ix = 0; (unsigned)f_ix != gi_ptr->n_functions; f_ix++) | |
345 | { | |
346 | gfi_ptr = gi_ptr->functions[f_ix]; | |
347 | ||
348 | if (gfi_ptr && gfi_ptr->key != gi_ptr) | |
349 | gfi_ptr = 0; | |
350 | ||
351 | crc32 = crc32_unsigned (crc32, gfi_ptr ? gfi_ptr->cfg_checksum : 0); | |
352 | crc32 = crc32_unsigned (crc32, | |
353 | gfi_ptr ? gfi_ptr->lineno_checksum : 0); | |
354 | if (!gfi_ptr) | |
355 | continue; | |
356 | ||
357 | ci_ptr = gfi_ptr->ctrs; | |
358 | for (t_ix = 0; t_ix != GCOV_COUNTERS_SUMMABLE; t_ix++) | |
359 | { | |
360 | if (!gi_ptr->merge[t_ix]) | |
361 | continue; | |
362 | ||
2c973ee7 | 363 | cs_ptr = &(this_prg->ctrs[t_ix]); |
d6d3f033 RX |
364 | cs_ptr->num += ci_ptr->num; |
365 | crc32 = crc32_unsigned (crc32, ci_ptr->num); | |
366 | ||
367 | for (c_num = 0; c_num < ci_ptr->num; c_num++) | |
368 | { | |
369 | cs_ptr->sum_all += ci_ptr->values[c_num]; | |
370 | if (cs_ptr->run_max < ci_ptr->values[c_num]) | |
371 | cs_ptr->run_max = ci_ptr->values[c_num]; | |
372 | } | |
373 | ci_ptr++; | |
374 | } | |
375 | } | |
376 | } | |
2c973ee7 | 377 | gcov_compute_histogram (this_prg); |
867c8b03 | 378 | return crc32; |
d6d3f033 RX |
379 | } |
380 | ||
381 | /* A struct that bundles all the related information about the | |
382 | gcda filename. */ | |
383 | struct gcov_filename_aux{ | |
384 | char *gi_filename_up; | |
385 | int gcov_prefix_strip; | |
386 | size_t prefix_length; | |
387 | }; | |
388 | ||
389 | /* Including system dependent components. */ | |
390 | #include "libgcov-driver-system.c" | |
391 | ||
392 | /* This function merges counters in GI_PTR to an existing gcda file. | |
393 | Return 0 on success. | |
394 | Return -1 on error. In this case, caller will goto read_fatal. */ | |
395 | ||
396 | static int | |
397 | gcov_exit_merge_gcda (struct gcov_info *gi_ptr, | |
398 | struct gcov_summary *prg_p, | |
2c973ee7 | 399 | struct gcov_summary *this_prg, |
d6d3f033 | 400 | gcov_position_t *summary_pos_p, |
867c8b03 JH |
401 | gcov_position_t *eof_pos_p, |
402 | gcov_unsigned_t crc32) | |
d6d3f033 RX |
403 | { |
404 | gcov_unsigned_t tag, length; | |
405 | unsigned t_ix; | |
406 | int f_ix; | |
407 | int error = 0; | |
408 | struct gcov_fn_buffer **fn_tail = &fn_buffer; | |
409 | struct gcov_summary_buffer **sum_tail = &sum_buffer; | |
410 | ||
411 | length = gcov_read_unsigned (); | |
412 | if (!gcov_version (gi_ptr, length, gi_filename)) | |
413 | return -1; | |
414 | ||
415 | length = gcov_read_unsigned (); | |
416 | if (length != gi_ptr->stamp) | |
417 | /* Read from a different compilation. Overwrite the file. */ | |
418 | return 0; | |
419 | ||
420 | /* Look for program summary. */ | |
421 | for (f_ix = 0;;) | |
422 | { | |
423 | struct gcov_summary tmp; | |
424 | ||
425 | *eof_pos_p = gcov_position (); | |
426 | tag = gcov_read_unsigned (); | |
427 | if (tag != GCOV_TAG_PROGRAM_SUMMARY) | |
428 | break; | |
429 | ||
430 | f_ix--; | |
431 | length = gcov_read_unsigned (); | |
432 | gcov_read_summary (&tmp); | |
433 | if ((error = gcov_is_error ())) | |
434 | goto read_error; | |
435 | if (*summary_pos_p) | |
436 | { | |
437 | /* Save all summaries after the one that will be | |
438 | merged into below. These will need to be rewritten | |
439 | as histogram merging may change the number of non-zero | |
440 | histogram entries that will be emitted, and thus the | |
441 | size of the merged summary. */ | |
442 | (*sum_tail) = (struct gcov_summary_buffer *) | |
40d6b753 | 443 | xmalloc (sizeof(struct gcov_summary_buffer)); |
d6d3f033 RX |
444 | (*sum_tail)->summary = tmp; |
445 | (*sum_tail)->next = 0; | |
446 | sum_tail = &((*sum_tail)->next); | |
447 | goto next_summary; | |
448 | } | |
449 | if (tmp.checksum != crc32) | |
450 | goto next_summary; | |
451 | ||
452 | for (t_ix = 0; t_ix != GCOV_COUNTERS_SUMMABLE; t_ix++) | |
2c973ee7 | 453 | if (tmp.ctrs[t_ix].num != this_prg->ctrs[t_ix].num) |
d6d3f033 RX |
454 | goto next_summary; |
455 | *prg_p = tmp; | |
456 | *summary_pos_p = *eof_pos_p; | |
457 | ||
458 | next_summary:; | |
459 | } | |
460 | ||
461 | /* Merge execution counts for each function. */ | |
462 | for (f_ix = 0; (unsigned)f_ix != gi_ptr->n_functions; | |
463 | f_ix++, tag = gcov_read_unsigned ()) | |
464 | { | |
465 | const struct gcov_ctr_info *ci_ptr; | |
466 | const struct gcov_fn_info *gfi_ptr = gi_ptr->functions[f_ix]; | |
467 | ||
468 | if (tag != GCOV_TAG_FUNCTION) | |
469 | goto read_mismatch; | |
470 | ||
471 | length = gcov_read_unsigned (); | |
472 | if (!length) | |
473 | /* This function did not appear in the other program. | |
474 | We have nothing to merge. */ | |
475 | continue; | |
476 | ||
477 | if (length != GCOV_TAG_FUNCTION_LENGTH) | |
478 | goto read_mismatch; | |
479 | ||
480 | if (!gfi_ptr || gfi_ptr->key != gi_ptr) | |
481 | { | |
482 | /* This function appears in the other program. We | |
483 | need to buffer the information in order to write | |
484 | it back out -- we'll be inserting data before | |
485 | this point, so cannot simply keep the data in the | |
486 | file. */ | |
487 | fn_tail = buffer_fn_data (gi_filename, | |
488 | gi_ptr, fn_tail, f_ix); | |
489 | if (!fn_tail) | |
490 | goto read_mismatch; | |
491 | continue; | |
492 | } | |
493 | ||
494 | length = gcov_read_unsigned (); | |
495 | if (length != gfi_ptr->ident) | |
496 | goto read_mismatch; | |
497 | ||
498 | length = gcov_read_unsigned (); | |
499 | if (length != gfi_ptr->lineno_checksum) | |
500 | goto read_mismatch; | |
501 | ||
502 | length = gcov_read_unsigned (); | |
503 | if (length != gfi_ptr->cfg_checksum) | |
504 | goto read_mismatch; | |
505 | ||
506 | ci_ptr = gfi_ptr->ctrs; | |
507 | for (t_ix = 0; t_ix < GCOV_COUNTERS; t_ix++) | |
508 | { | |
509 | gcov_merge_fn merge = gi_ptr->merge[t_ix]; | |
510 | ||
511 | if (!merge) | |
512 | continue; | |
513 | ||
514 | tag = gcov_read_unsigned (); | |
515 | length = gcov_read_unsigned (); | |
516 | if (tag != GCOV_TAG_FOR_COUNTER (t_ix) | |
517 | || length != GCOV_TAG_COUNTER_LENGTH (ci_ptr->num)) | |
518 | goto read_mismatch; | |
519 | (*merge) (ci_ptr->values, ci_ptr->num); | |
520 | ci_ptr++; | |
521 | } | |
522 | if ((error = gcov_is_error ())) | |
523 | goto read_error; | |
524 | } | |
525 | ||
526 | if (tag) | |
527 | { | |
528 | read_mismatch:; | |
529 | gcov_error ("profiling:%s:Merge mismatch for %s %u\n", | |
530 | gi_filename, f_ix >= 0 ? "function" : "summary", | |
531 | f_ix < 0 ? -1 - f_ix : f_ix); | |
532 | return -1; | |
533 | } | |
534 | return 0; | |
535 | ||
536 | read_error: | |
537 | gcov_error ("profiling:%s:%s merging\n", gi_filename, | |
538 | error < 0 ? "Overflow": "Error"); | |
539 | return -1; | |
540 | } | |
541 | ||
542 | /* Write counters in GI_PTR and the summary in PRG to a gcda file. In | |
543 | the case of appending to an existing file, SUMMARY_POS will be non-zero. | |
544 | We will write the file starting from SUMMAY_POS. */ | |
545 | ||
546 | static void | |
547 | gcov_exit_write_gcda (const struct gcov_info *gi_ptr, | |
548 | const struct gcov_summary *prg_p, | |
549 | const gcov_position_t eof_pos, | |
550 | const gcov_position_t summary_pos) | |
551 | { | |
552 | unsigned f_ix; | |
553 | struct gcov_summary_buffer *next_sum_buffer; | |
554 | ||
555 | /* Write out the data. */ | |
556 | if (!eof_pos) | |
557 | { | |
558 | gcov_write_tag_length (GCOV_DATA_MAGIC, GCOV_VERSION); | |
559 | gcov_write_unsigned (gi_ptr->stamp); | |
560 | } | |
561 | ||
562 | if (summary_pos) | |
563 | gcov_seek (summary_pos); | |
564 | ||
565 | /* Generate whole program statistics. */ | |
566 | gcov_write_summary (GCOV_TAG_PROGRAM_SUMMARY, prg_p); | |
567 | ||
568 | /* Rewrite all the summaries that were after the summary we merged | |
569 | into. This is necessary as the merged summary may have a different | |
570 | size due to the number of non-zero histogram entries changing after | |
571 | merging. */ | |
572 | ||
573 | while (sum_buffer) | |
574 | { | |
575 | gcov_write_summary (GCOV_TAG_PROGRAM_SUMMARY, &sum_buffer->summary); | |
576 | next_sum_buffer = sum_buffer->next; | |
577 | free (sum_buffer); | |
578 | sum_buffer = next_sum_buffer; | |
579 | } | |
580 | ||
581 | /* Write execution counts for each function. */ | |
582 | for (f_ix = 0; f_ix != gi_ptr->n_functions; f_ix++) | |
583 | { | |
584 | unsigned buffered = 0; | |
585 | const struct gcov_fn_info *gfi_ptr; | |
586 | const struct gcov_ctr_info *ci_ptr; | |
587 | gcov_unsigned_t length; | |
588 | unsigned t_ix; | |
589 | ||
590 | if (fn_buffer && fn_buffer->fn_ix == f_ix) | |
591 | { | |
592 | /* Buffered data from another program. */ | |
593 | buffered = 1; | |
594 | gfi_ptr = &fn_buffer->info; | |
595 | length = GCOV_TAG_FUNCTION_LENGTH; | |
596 | } | |
597 | else | |
598 | { | |
599 | gfi_ptr = gi_ptr->functions[f_ix]; | |
600 | if (gfi_ptr && gfi_ptr->key == gi_ptr) | |
601 | length = GCOV_TAG_FUNCTION_LENGTH; | |
602 | else | |
603 | length = 0; | |
604 | } | |
605 | ||
606 | gcov_write_tag_length (GCOV_TAG_FUNCTION, length); | |
607 | if (!length) | |
608 | continue; | |
609 | ||
610 | gcov_write_unsigned (gfi_ptr->ident); | |
611 | gcov_write_unsigned (gfi_ptr->lineno_checksum); | |
612 | gcov_write_unsigned (gfi_ptr->cfg_checksum); | |
613 | ||
614 | ci_ptr = gfi_ptr->ctrs; | |
615 | for (t_ix = 0; t_ix < GCOV_COUNTERS; t_ix++) | |
616 | { | |
617 | gcov_unsigned_t n_counts; | |
618 | gcov_type *c_ptr; | |
619 | ||
620 | if (!gi_ptr->merge[t_ix]) | |
621 | continue; | |
622 | ||
623 | n_counts = ci_ptr->num; | |
624 | gcov_write_tag_length (GCOV_TAG_FOR_COUNTER (t_ix), | |
625 | GCOV_TAG_COUNTER_LENGTH (n_counts)); | |
626 | c_ptr = ci_ptr->values; | |
627 | while (n_counts--) | |
628 | gcov_write_counter (*c_ptr++); | |
629 | ci_ptr++; | |
630 | } | |
631 | if (buffered) | |
632 | fn_buffer = free_fn_data (gi_ptr, fn_buffer, GCOV_COUNTERS); | |
633 | } | |
634 | ||
635 | gcov_write_unsigned (0); | |
636 | } | |
637 | ||
638 | /* Helper function for merging summary. | |
639 | Return -1 on error. Return 0 on success. */ | |
640 | ||
641 | static int | |
867c8b03 | 642 | gcov_exit_merge_summary (const struct gcov_info *gi_ptr, struct gcov_summary *prg, |
2c973ee7 | 643 | struct gcov_summary *this_prg, gcov_unsigned_t crc32, |
7f369373 | 644 | struct gcov_summary *all_prg __attribute__ ((unused))) |
d6d3f033 RX |
645 | { |
646 | struct gcov_ctr_summary *cs_prg, *cs_tprg; | |
d6d3f033 | 647 | unsigned t_ix; |
867c8b03 JH |
648 | #if !GCOV_LOCKED |
649 | /* summary for all instances of program. */ | |
650 | struct gcov_ctr_summary *cs_all; | |
651 | #endif | |
d6d3f033 RX |
652 | |
653 | /* Merge the summaries. */ | |
654 | for (t_ix = 0; t_ix < GCOV_COUNTERS_SUMMABLE; t_ix++) | |
655 | { | |
656 | cs_prg = &(prg->ctrs[t_ix]); | |
2c973ee7 | 657 | cs_tprg = &(this_prg->ctrs[t_ix]); |
d6d3f033 RX |
658 | |
659 | if (gi_ptr->merge[t_ix]) | |
660 | { | |
867c8b03 JH |
661 | int first = !cs_prg->runs; |
662 | ||
663 | if (!run_accounted) | |
664 | cs_prg->runs++; | |
867c8b03 | 665 | if (first) |
d6d3f033 RX |
666 | cs_prg->num = cs_tprg->num; |
667 | cs_prg->sum_all += cs_tprg->sum_all; | |
668 | if (cs_prg->run_max < cs_tprg->run_max) | |
669 | cs_prg->run_max = cs_tprg->run_max; | |
670 | cs_prg->sum_max += cs_tprg->run_max; | |
867c8b03 | 671 | if (first) |
d6d3f033 RX |
672 | memcpy (cs_prg->histogram, cs_tprg->histogram, |
673 | sizeof (gcov_bucket_type) * GCOV_HISTOGRAM_SIZE); | |
674 | else | |
675 | gcov_histogram_merge (cs_prg->histogram, cs_tprg->histogram); | |
676 | } | |
677 | else if (cs_prg->runs) | |
678 | { | |
679 | gcov_error ("profiling:%s:Merge mismatch for summary.\n", | |
680 | gi_filename); | |
681 | return -1; | |
682 | } | |
d6d3f033 | 683 | #if !GCOV_LOCKED |
867c8b03 | 684 | cs_all = &all_prg->ctrs[t_ix]; |
d6d3f033 RX |
685 | if (!cs_all->runs && cs_prg->runs) |
686 | { | |
687 | cs_all->num = cs_prg->num; | |
688 | cs_all->runs = cs_prg->runs; | |
689 | cs_all->sum_all = cs_prg->sum_all; | |
690 | cs_all->run_max = cs_prg->run_max; | |
691 | cs_all->sum_max = cs_prg->sum_max; | |
692 | } | |
867c8b03 | 693 | else if (!all_prg->checksum |
d6d3f033 RX |
694 | /* Don't compare the histograms, which may have slight |
695 | variations depending on the order they were updated | |
696 | due to the truncating integer divides used in the | |
697 | merge. */ | |
698 | && (cs_all->num != cs_prg->num | |
699 | || cs_all->runs != cs_prg->runs | |
700 | || cs_all->sum_all != cs_prg->sum_all | |
701 | || cs_all->run_max != cs_prg->run_max | |
702 | || cs_all->sum_max != cs_prg->sum_max)) | |
703 | { | |
704 | gcov_error ("profiling:%s:Data file mismatch - some " | |
705 | "data files may have been concurrently " | |
706 | "updated without locking support\n", gi_filename); | |
867c8b03 | 707 | all_prg->checksum = ~0u; |
d6d3f033 RX |
708 | } |
709 | #endif | |
710 | } | |
40d6b753 | 711 | |
d6d3f033 RX |
712 | prg->checksum = crc32; |
713 | ||
714 | return 0; | |
715 | } | |
716 | ||
717 | /* Dump the coverage counts for one gcov_info object. We merge with existing | |
718 | counts when possible, to avoid growing the .da files ad infinitum. We use | |
719 | this program's checksum to make sure we only accumulate whole program | |
720 | statistics to the correct summary. An object file might be embedded | |
721 | in two separate programs, and we must keep the two program | |
722 | summaries separate. */ | |
723 | ||
724 | static void | |
867c8b03 | 725 | gcov_exit_dump_gcov (struct gcov_info *gi_ptr, struct gcov_filename_aux *gf, |
2c973ee7 RX |
726 | gcov_unsigned_t crc32, struct gcov_summary *all_prg, |
727 | struct gcov_summary *this_prg) | |
d6d3f033 RX |
728 | { |
729 | struct gcov_summary prg; /* summary for this object over all program. */ | |
730 | int error; | |
731 | gcov_unsigned_t tag; | |
732 | gcov_position_t summary_pos = 0; | |
733 | gcov_position_t eof_pos = 0; | |
734 | ||
735 | fn_buffer = 0; | |
736 | sum_buffer = 0; | |
737 | ||
738 | error = gcov_exit_open_gcda_file (gi_ptr, gf); | |
739 | if (error == -1) | |
740 | return; | |
741 | ||
742 | tag = gcov_read_unsigned (); | |
743 | if (tag) | |
744 | { | |
745 | /* Merge data from file. */ | |
746 | if (tag != GCOV_DATA_MAGIC) | |
747 | { | |
748 | gcov_error ("profiling:%s:Not a gcov data file\n", gi_filename); | |
749 | goto read_fatal; | |
750 | } | |
2c973ee7 | 751 | error = gcov_exit_merge_gcda (gi_ptr, &prg, this_prg, &summary_pos, &eof_pos, |
867c8b03 | 752 | crc32); |
d6d3f033 RX |
753 | if (error == -1) |
754 | goto read_fatal; | |
755 | } | |
756 | ||
757 | gcov_rewrite (); | |
758 | ||
759 | if (!summary_pos) | |
760 | { | |
761 | memset (&prg, 0, sizeof (prg)); | |
762 | summary_pos = eof_pos; | |
763 | } | |
764 | ||
2c973ee7 | 765 | error = gcov_exit_merge_summary (gi_ptr, &prg, this_prg, crc32, all_prg); |
d6d3f033 RX |
766 | if (error == -1) |
767 | goto read_fatal; | |
768 | ||
769 | gcov_exit_write_gcda (gi_ptr, &prg, eof_pos, summary_pos); | |
770 | /* fall through */ | |
771 | ||
772 | read_fatal:; | |
773 | while (fn_buffer) | |
774 | fn_buffer = free_fn_data (gi_ptr, fn_buffer, GCOV_COUNTERS); | |
775 | ||
776 | if ((error = gcov_close ())) | |
777 | gcov_error (error < 0 ? | |
778 | "profiling:%s:Overflow writing\n" : | |
779 | "profiling:%s:Error writing\n", | |
780 | gi_filename); | |
781 | } | |
782 | ||
783 | ||
784 | /* Dump all the coverage counts for the program. It first computes program | |
785 | summary and then traverses gcov_list list and dumps the gcov_info | |
786 | objects one by one. */ | |
787 | ||
788 | void | |
789 | gcov_exit (void) | |
790 | { | |
791 | struct gcov_info *gi_ptr; | |
792 | struct gcov_filename_aux gf; | |
867c8b03 JH |
793 | gcov_unsigned_t crc32; |
794 | struct gcov_summary all_prg; | |
2c973ee7 | 795 | struct gcov_summary this_prg; |
d6d3f033 RX |
796 | |
797 | /* Prevent the counters from being dumped a second time on exit when the | |
798 | application already wrote out the profile using __gcov_dump(). */ | |
799 | if (gcov_dump_complete) | |
800 | return; | |
801 | ||
2c973ee7 | 802 | crc32 = gcov_exit_compute_summary (&this_prg); |
d6d3f033 RX |
803 | |
804 | allocate_filename_struct (&gf); | |
867c8b03 JH |
805 | #if !GCOV_LOCKED |
806 | memset (&all_prg, 0, sizeof (all_prg)); | |
807 | #endif | |
d6d3f033 RX |
808 | |
809 | /* Now merge each file. */ | |
810 | for (gi_ptr = gcov_list; gi_ptr; gi_ptr = gi_ptr->next) | |
2c973ee7 | 811 | gcov_exit_dump_gcov (gi_ptr, &gf, crc32, &all_prg, &this_prg); |
7f369373 | 812 | run_accounted = 1; |
d6d3f033 RX |
813 | |
814 | if (gi_filename) | |
815 | free (gi_filename); | |
816 | } | |
817 | ||
818 | /* Reset all counters to zero. */ | |
819 | ||
820 | void | |
821 | gcov_clear (void) | |
822 | { | |
823 | const struct gcov_info *gi_ptr; | |
824 | ||
825 | for (gi_ptr = gcov_list; gi_ptr; gi_ptr = gi_ptr->next) | |
826 | { | |
827 | unsigned f_ix; | |
828 | ||
829 | for (f_ix = 0; f_ix < gi_ptr->n_functions; f_ix++) | |
830 | { | |
831 | unsigned t_ix; | |
832 | const struct gcov_fn_info *gfi_ptr = gi_ptr->functions[f_ix]; | |
833 | ||
834 | if (!gfi_ptr || gfi_ptr->key != gi_ptr) | |
835 | continue; | |
836 | const struct gcov_ctr_info *ci_ptr = gfi_ptr->ctrs; | |
837 | for (t_ix = 0; t_ix != GCOV_COUNTERS; t_ix++) | |
838 | { | |
839 | if (!gi_ptr->merge[t_ix]) | |
840 | continue; | |
841 | ||
842 | memset (ci_ptr->values, 0, sizeof (gcov_type) * ci_ptr->num); | |
843 | ci_ptr++; | |
844 | } | |
845 | } | |
846 | } | |
847 | } | |
848 | ||
849 | /* Add a new object file onto the bb chain. Invoked automatically | |
850 | when running an object file's global ctors. */ | |
851 | ||
852 | void | |
853 | __gcov_init (struct gcov_info *info) | |
854 | { | |
855 | if (!info->version || !info->n_functions) | |
856 | return; | |
857 | if (gcov_version (info, info->version, 0)) | |
858 | { | |
859 | size_t filename_length = strlen(info->filename); | |
860 | ||
861 | /* Refresh the longest file name information */ | |
862 | if (filename_length > gcov_max_filename) | |
863 | gcov_max_filename = filename_length; | |
864 | ||
865 | if (!gcov_list) | |
866 | atexit (gcov_exit); | |
867 | ||
868 | info->next = gcov_list; | |
869 | gcov_list = info; | |
870 | } | |
871 | info->version = 0; | |
872 | } | |
873 | ||
874 | #endif /* L_gcov */ | |
875 | #endif /* inhibit_libc */ |