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6ce4e61f CC |
1 | /* |
2 | * GIT - The information manager from hell | |
3 | * | |
4 | * Copyright (C) 2000-2002 Michael R. Elkins <me@mutt.org> | |
5 | * Copyright (C) 2002-2004 Oswald Buddenhagen <ossi@users.sf.net> | |
6 | * Copyright (C) 2004 Theodore Y. Ts'o <tytso@mit.edu> | |
7 | * Copyright (C) 2006 Mike McCormack | |
8 | * Copyright (C) 2006 Christian Couder | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | * GNU General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License | |
48425792 | 21 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
6ce4e61f CC |
22 | */ |
23 | ||
24 | #include "cache.h" | |
25 | #include "quote.h" | |
26 | ||
406102a7 | 27 | struct trace_key trace_default_key = { "GIT_TRACE", 0, 0, 0 }; |
8eeb25c6 | 28 | struct trace_key trace_perf_key = TRACE_KEY_INIT(PERFORMANCE); |
cb507619 | 29 | struct trace_key trace_setup_key = TRACE_KEY_INIT(SETUP); |
c81539b5 | 30 | |
06796607 | 31 | /* Get a trace file descriptor from "key" env variable. */ |
6aa30857 | 32 | static int get_trace_fd(struct trace_key *key) |
6ce4e61f | 33 | { |
6aa30857 KB |
34 | const char *trace; |
35 | ||
6aa30857 KB |
36 | /* don't open twice */ |
37 | if (key->initialized) | |
38 | return key->fd; | |
39 | ||
40 | trace = getenv(key->key); | |
6ce4e61f | 41 | |
6844fc80 CC |
42 | if (!trace || !strcmp(trace, "") || |
43 | !strcmp(trace, "0") || !strcasecmp(trace, "false")) | |
6aa30857 KB |
44 | key->fd = 0; |
45 | else if (!strcmp(trace, "1") || !strcasecmp(trace, "true")) | |
46 | key->fd = STDERR_FILENO; | |
47 | else if (strlen(trace) == 1 && isdigit(*trace)) | |
48 | key->fd = atoi(trace); | |
49 | else if (is_absolute_path(trace)) { | |
6ce4e61f CC |
50 | int fd = open(trace, O_WRONLY | O_APPEND | O_CREAT, 0666); |
51 | if (fd == -1) { | |
6f253057 | 52 | warning("could not open '%s' for tracing: %s", |
6ce4e61f | 53 | trace, strerror(errno)); |
6f253057 | 54 | trace_disable(key); |
6aa30857 KB |
55 | } else { |
56 | key->fd = fd; | |
57 | key->need_close = 1; | |
6ce4e61f | 58 | } |
6aa30857 | 59 | } else { |
b3a1c5da JK |
60 | warning("unknown trace value for '%s': %s\n" |
61 | " If you want to trace into a file, then please set %s\n" | |
6f253057 | 62 | " to an absolute pathname (starting with /)", |
b3a1c5da | 63 | key->key, trace, key->key); |
6f253057 | 64 | trace_disable(key); |
6ce4e61f CC |
65 | } |
66 | ||
6aa30857 KB |
67 | key->initialized = 1; |
68 | return key->fd; | |
69 | } | |
6ce4e61f | 70 | |
6aa30857 KB |
71 | void trace_disable(struct trace_key *key) |
72 | { | |
73 | if (key->need_close) | |
74 | close(key->fd); | |
75 | key->fd = 0; | |
76 | key->initialized = 1; | |
77 | key->need_close = 0; | |
6ce4e61f CC |
78 | } |
79 | ||
e05bed96 KB |
80 | static int prepare_trace_line(const char *file, int line, |
81 | struct trace_key *key, struct strbuf *buf) | |
c69dfd24 | 82 | { |
124647c4 | 83 | static struct trace_key trace_bare = TRACE_KEY_INIT(BARE); |
b72be02c KB |
84 | struct timeval tv; |
85 | struct tm tm; | |
86 | time_t secs; | |
124647c4 | 87 | |
c69dfd24 KB |
88 | if (!trace_want(key)) |
89 | return 0; | |
90 | ||
91 | set_try_to_free_routine(NULL); /* is never reset */ | |
92 | ||
124647c4 KB |
93 | /* unit tests may want to disable additional trace output */ |
94 | if (trace_want(&trace_bare)) | |
95 | return 1; | |
96 | ||
b72be02c KB |
97 | /* print current timestamp */ |
98 | gettimeofday(&tv, NULL); | |
99 | secs = tv.tv_sec; | |
100 | localtime_r(&secs, &tm); | |
101 | strbuf_addf(buf, "%02d:%02d:%02d.%06ld ", tm.tm_hour, tm.tm_min, | |
102 | tm.tm_sec, (long) tv.tv_usec); | |
c69dfd24 | 103 | |
e05bed96 KB |
104 | #ifdef HAVE_VARIADIC_MACROS |
105 | /* print file:line */ | |
106 | strbuf_addf(buf, "%s:%d ", file, line); | |
107 | /* align trace output (column 40 catches most files names in git) */ | |
108 | while (buf->len < 40) | |
109 | strbuf_addch(buf, ' '); | |
110 | #endif | |
111 | ||
c69dfd24 KB |
112 | return 1; |
113 | } | |
114 | ||
c0222e76 JK |
115 | static void trace_write(struct trace_key *key, const void *buf, unsigned len) |
116 | { | |
3b0c3ab7 | 117 | if (write_in_full(get_trace_fd(key), buf, len) < 0) { |
3b0c3ab7 JK |
118 | warning("unable to write trace for %s: %s", |
119 | key->key, strerror(errno)); | |
46ac74b7 | 120 | trace_disable(key); |
3b0c3ab7 | 121 | } |
c0222e76 JK |
122 | } |
123 | ||
32359838 JK |
124 | void trace_verbatim(struct trace_key *key, const void *buf, unsigned len) |
125 | { | |
126 | if (!trace_want(key)) | |
127 | return; | |
c0222e76 | 128 | trace_write(key, buf, len); |
32359838 JK |
129 | } |
130 | ||
c69dfd24 KB |
131 | static void print_trace_line(struct trace_key *key, struct strbuf *buf) |
132 | { | |
a0d4923d | 133 | strbuf_complete_line(buf); |
c0222e76 | 134 | trace_write(key, buf->buf, buf->len); |
c69dfd24 KB |
135 | } |
136 | ||
e05bed96 KB |
137 | static void trace_vprintf_fl(const char *file, int line, struct trace_key *key, |
138 | const char *format, va_list ap) | |
6ce4e61f | 139 | { |
ebeb6090 | 140 | struct strbuf buf = STRBUF_INIT; |
6ce4e61f | 141 | |
e05bed96 | 142 | if (!prepare_trace_line(file, line, key, &buf)) |
6ce4e61f CC |
143 | return; |
144 | ||
4a3b0b25 | 145 | strbuf_vaddf(&buf, format, ap); |
c69dfd24 | 146 | print_trace_line(key, &buf); |
33011e76 | 147 | strbuf_release(&buf); |
6ce4e61f CC |
148 | } |
149 | ||
e05bed96 KB |
150 | static void trace_argv_vprintf_fl(const char *file, int line, |
151 | const char **argv, const char *format, | |
152 | va_list ap) | |
06796607 | 153 | { |
66f66c59 | 154 | struct strbuf buf = STRBUF_INIT; |
06796607 | 155 | |
406102a7 | 156 | if (!prepare_trace_line(file, line, &trace_default_key, &buf)) |
66f66c59 KB |
157 | return; |
158 | ||
66f66c59 | 159 | strbuf_vaddf(&buf, format, ap); |
66f66c59 | 160 | |
1fbdab21 | 161 | sq_quote_argv_pretty(&buf, argv); |
406102a7 | 162 | print_trace_line(&trace_default_key, &buf); |
33011e76 | 163 | strbuf_release(&buf); |
c6053543 JK |
164 | } |
165 | ||
e05bed96 KB |
166 | void trace_strbuf_fl(const char *file, int line, struct trace_key *key, |
167 | const struct strbuf *data) | |
94b3b374 | 168 | { |
c69dfd24 KB |
169 | struct strbuf buf = STRBUF_INIT; |
170 | ||
e05bed96 | 171 | if (!prepare_trace_line(file, line, key, &buf)) |
94b3b374 JK |
172 | return; |
173 | ||
c69dfd24 KB |
174 | strbuf_addbuf(&buf, data); |
175 | print_trace_line(key, &buf); | |
33011e76 | 176 | strbuf_release(&buf); |
94b3b374 JK |
177 | } |
178 | ||
c46c406a NTND |
179 | static uint64_t perf_start_times[10]; |
180 | static int perf_indent; | |
181 | ||
182 | uint64_t trace_performance_enter(void) | |
183 | { | |
184 | uint64_t now; | |
185 | ||
186 | if (!trace_want(&trace_perf_key)) | |
187 | return 0; | |
188 | ||
189 | now = getnanotime(); | |
190 | perf_start_times[perf_indent] = now; | |
191 | if (perf_indent + 1 < ARRAY_SIZE(perf_start_times)) | |
192 | perf_indent++; | |
193 | else | |
194 | BUG("Too deep indentation"); | |
195 | return now; | |
196 | } | |
197 | ||
09b2c1c7 KB |
198 | static void trace_performance_vprintf_fl(const char *file, int line, |
199 | uint64_t nanos, const char *format, | |
200 | va_list ap) | |
201 | { | |
c46c406a | 202 | static const char space[] = " "; |
09b2c1c7 KB |
203 | struct strbuf buf = STRBUF_INIT; |
204 | ||
205 | if (!prepare_trace_line(file, line, &trace_perf_key, &buf)) | |
206 | return; | |
207 | ||
208 | strbuf_addf(&buf, "performance: %.9f s", (double) nanos / 1000000000); | |
209 | ||
210 | if (format && *format) { | |
c46c406a NTND |
211 | if (perf_indent >= strlen(space)) |
212 | BUG("Too deep indentation"); | |
213 | ||
214 | strbuf_addf(&buf, ":%.*s ", perf_indent, space); | |
09b2c1c7 KB |
215 | strbuf_vaddf(&buf, format, ap); |
216 | } | |
217 | ||
218 | print_trace_line(&trace_perf_key, &buf); | |
33011e76 | 219 | strbuf_release(&buf); |
09b2c1c7 KB |
220 | } |
221 | ||
e05bed96 KB |
222 | #ifndef HAVE_VARIADIC_MACROS |
223 | ||
66f66c59 | 224 | void trace_printf(const char *format, ...) |
6ce4e61f | 225 | { |
19247e55 | 226 | va_list ap; |
4a3b0b25 | 227 | va_start(ap, format); |
406102a7 | 228 | trace_vprintf_fl(NULL, 0, &trace_default_key, format, ap); |
19247e55 | 229 | va_end(ap); |
66f66c59 | 230 | } |
6ce4e61f | 231 | |
66f66c59 KB |
232 | void trace_printf_key(struct trace_key *key, const char *format, ...) |
233 | { | |
234 | va_list ap; | |
235 | va_start(ap, format); | |
e05bed96 KB |
236 | trace_vprintf_fl(NULL, 0, key, format, ap); |
237 | va_end(ap); | |
238 | } | |
239 | ||
240 | void trace_argv_printf(const char **argv, const char *format, ...) | |
241 | { | |
242 | va_list ap; | |
243 | va_start(ap, format); | |
244 | trace_argv_vprintf_fl(NULL, 0, argv, format, ap); | |
66f66c59 | 245 | va_end(ap); |
6ce4e61f | 246 | } |
a9ca8a85 | 247 | |
792a646a | 248 | void trace_strbuf(struct trace_key *key, const struct strbuf *data) |
e05bed96 KB |
249 | { |
250 | trace_strbuf_fl(NULL, 0, key, data); | |
251 | } | |
252 | ||
09b2c1c7 KB |
253 | void trace_performance(uint64_t nanos, const char *format, ...) |
254 | { | |
255 | va_list ap; | |
256 | va_start(ap, format); | |
257 | trace_performance_vprintf_fl(NULL, 0, nanos, format, ap); | |
258 | va_end(ap); | |
259 | } | |
260 | ||
261 | void trace_performance_since(uint64_t start, const char *format, ...) | |
262 | { | |
263 | va_list ap; | |
264 | va_start(ap, format); | |
265 | trace_performance_vprintf_fl(NULL, 0, getnanotime() - start, | |
266 | format, ap); | |
267 | va_end(ap); | |
268 | } | |
269 | ||
c46c406a NTND |
270 | void trace_performance_leave(const char *format, ...) |
271 | { | |
272 | va_list ap; | |
273 | uint64_t since; | |
274 | ||
275 | if (perf_indent) | |
276 | perf_indent--; | |
277 | ||
278 | if (!format) /* Allow callers to leave without tracing anything */ | |
279 | return; | |
280 | ||
281 | since = perf_start_times[perf_indent]; | |
282 | va_start(ap, format); | |
283 | trace_performance_vprintf_fl(NULL, 0, getnanotime() - since, | |
284 | format, ap); | |
285 | va_end(ap); | |
286 | } | |
287 | ||
e05bed96 KB |
288 | #else |
289 | ||
290 | void trace_printf_key_fl(const char *file, int line, struct trace_key *key, | |
291 | const char *format, ...) | |
292 | { | |
293 | va_list ap; | |
294 | va_start(ap, format); | |
295 | trace_vprintf_fl(file, line, key, format, ap); | |
296 | va_end(ap); | |
297 | } | |
298 | ||
299 | void trace_argv_printf_fl(const char *file, int line, const char **argv, | |
300 | const char *format, ...) | |
301 | { | |
302 | va_list ap; | |
303 | va_start(ap, format); | |
304 | trace_argv_vprintf_fl(file, line, argv, format, ap); | |
305 | va_end(ap); | |
306 | } | |
307 | ||
09b2c1c7 KB |
308 | void trace_performance_fl(const char *file, int line, uint64_t nanos, |
309 | const char *format, ...) | |
310 | { | |
311 | va_list ap; | |
312 | va_start(ap, format); | |
313 | trace_performance_vprintf_fl(file, line, nanos, format, ap); | |
314 | va_end(ap); | |
315 | } | |
316 | ||
c46c406a NTND |
317 | void trace_performance_leave_fl(const char *file, int line, |
318 | uint64_t nanos, const char *format, ...) | |
319 | { | |
320 | va_list ap; | |
321 | uint64_t since; | |
322 | ||
323 | if (perf_indent) | |
324 | perf_indent--; | |
325 | ||
326 | if (!format) /* Allow callers to leave without tracing anything */ | |
327 | return; | |
328 | ||
329 | since = perf_start_times[perf_indent]; | |
330 | va_start(ap, format); | |
331 | trace_performance_vprintf_fl(file, line, nanos - since, format, ap); | |
332 | va_end(ap); | |
333 | } | |
334 | ||
e05bed96 KB |
335 | #endif /* HAVE_VARIADIC_MACROS */ |
336 | ||
337 | ||
a9ca8a85 NTND |
338 | static const char *quote_crnl(const char *path) |
339 | { | |
0bb443fd | 340 | static struct strbuf new_path = STRBUF_INIT; |
a9ca8a85 NTND |
341 | |
342 | if (!path) | |
343 | return NULL; | |
344 | ||
0bb443fd JK |
345 | strbuf_reset(&new_path); |
346 | ||
347 | while (*path) { | |
348 | switch (*path) { | |
349 | case '\\': strbuf_addstr(&new_path, "\\\\"); break; | |
350 | case '\n': strbuf_addstr(&new_path, "\\n"); break; | |
351 | case '\r': strbuf_addstr(&new_path, "\\r"); break; | |
a9ca8a85 | 352 | default: |
0bb443fd | 353 | strbuf_addch(&new_path, *path); |
a9ca8a85 | 354 | } |
0bb443fd | 355 | path++; |
a9ca8a85 | 356 | } |
0bb443fd | 357 | return new_path.buf; |
a9ca8a85 NTND |
358 | } |
359 | ||
360 | /* FIXME: move prefix to startup_info struct and get rid of this arg */ | |
361 | void trace_repo_setup(const char *prefix) | |
362 | { | |
e83c267f | 363 | const char *git_work_tree; |
56b9f6e7 | 364 | char *cwd; |
a9ca8a85 | 365 | |
cb507619 | 366 | if (!trace_want(&trace_setup_key)) |
a9ca8a85 NTND |
367 | return; |
368 | ||
56b9f6e7 | 369 | cwd = xgetcwd(); |
a9ca8a85 | 370 | |
e83c267f BC |
371 | if (!(git_work_tree = get_git_work_tree())) |
372 | git_work_tree = "(null)"; | |
373 | ||
374 | if (!prefix) | |
375 | prefix = "(null)"; | |
376 | ||
cb507619 NTND |
377 | trace_printf_key(&trace_setup_key, "setup: git_dir: %s\n", quote_crnl(get_git_dir())); |
378 | trace_printf_key(&trace_setup_key, "setup: git_common_dir: %s\n", quote_crnl(get_git_common_dir())); | |
379 | trace_printf_key(&trace_setup_key, "setup: worktree: %s\n", quote_crnl(git_work_tree)); | |
380 | trace_printf_key(&trace_setup_key, "setup: cwd: %s\n", quote_crnl(cwd)); | |
381 | trace_printf_key(&trace_setup_key, "setup: prefix: %s\n", quote_crnl(prefix)); | |
56b9f6e7 RS |
382 | |
383 | free(cwd); | |
a9ca8a85 | 384 | } |
39bc5e46 | 385 | |
6aa30857 | 386 | int trace_want(struct trace_key *key) |
39bc5e46 | 387 | { |
6aa30857 | 388 | return !!get_trace_fd(key); |
39bc5e46 | 389 | } |
148d6771 | 390 | |
a6c3c638 | 391 | #if defined(HAVE_CLOCK_GETTIME) && defined(HAVE_CLOCK_MONOTONIC) |
148d6771 KB |
392 | |
393 | static inline uint64_t highres_nanos(void) | |
394 | { | |
395 | struct timespec ts; | |
396 | if (clock_gettime(CLOCK_MONOTONIC, &ts)) | |
397 | return 0; | |
398 | return (uint64_t) ts.tv_sec * 1000000000 + ts.tv_nsec; | |
399 | } | |
400 | ||
401 | #elif defined (GIT_WINDOWS_NATIVE) | |
402 | ||
403 | static inline uint64_t highres_nanos(void) | |
404 | { | |
405 | static uint64_t high_ns, scaled_low_ns; | |
406 | static int scale; | |
407 | LARGE_INTEGER cnt; | |
408 | ||
409 | if (!scale) { | |
410 | if (!QueryPerformanceFrequency(&cnt)) | |
411 | return 0; | |
412 | ||
413 | /* high_ns = number of ns per cnt.HighPart */ | |
414 | high_ns = (1000000000LL << 32) / (uint64_t) cnt.QuadPart; | |
415 | ||
416 | /* | |
417 | * Number of ns per cnt.LowPart is 10^9 / frequency (or | |
418 | * high_ns >> 32). For maximum precision, we scale this factor | |
419 | * so that it just fits within 32 bit (i.e. won't overflow if | |
420 | * multiplied with cnt.LowPart). | |
421 | */ | |
422 | scaled_low_ns = high_ns; | |
423 | scale = 32; | |
424 | while (scaled_low_ns >= 0x100000000LL) { | |
425 | scaled_low_ns >>= 1; | |
426 | scale--; | |
427 | } | |
428 | } | |
429 | ||
430 | /* if QPF worked on initialization, we expect QPC to work as well */ | |
431 | QueryPerformanceCounter(&cnt); | |
432 | ||
433 | return (high_ns * cnt.HighPart) + | |
434 | ((scaled_low_ns * cnt.LowPart) >> scale); | |
435 | } | |
436 | ||
437 | #else | |
438 | # define highres_nanos() 0 | |
439 | #endif | |
440 | ||
441 | static inline uint64_t gettimeofday_nanos(void) | |
442 | { | |
443 | struct timeval tv; | |
444 | gettimeofday(&tv, NULL); | |
445 | return (uint64_t) tv.tv_sec * 1000000000 + tv.tv_usec * 1000; | |
446 | } | |
447 | ||
448 | /* | |
449 | * Returns nanoseconds since the epoch (01/01/1970), for performance tracing | |
450 | * (i.e. favoring high precision over wall clock time accuracy). | |
451 | */ | |
6433d569 | 452 | uint64_t getnanotime(void) |
148d6771 KB |
453 | { |
454 | static uint64_t offset; | |
455 | if (offset > 1) { | |
456 | /* initialization succeeded, return offset + high res time */ | |
457 | return offset + highres_nanos(); | |
458 | } else if (offset == 1) { | |
459 | /* initialization failed, fall back to gettimeofday */ | |
460 | return gettimeofday_nanos(); | |
461 | } else { | |
462 | /* initialize offset if high resolution timer works */ | |
463 | uint64_t now = gettimeofday_nanos(); | |
464 | uint64_t highres = highres_nanos(); | |
465 | if (highres) | |
466 | offset = now - highres; | |
467 | else | |
468 | offset = 1; | |
469 | return now; | |
470 | } | |
471 | } | |
578da039 | 472 | |
578da039 KB |
473 | static struct strbuf command_line = STRBUF_INIT; |
474 | ||
475 | static void print_command_performance_atexit(void) | |
476 | { | |
c46c406a | 477 | trace_performance_leave("git command:%s", command_line.buf); |
578da039 KB |
478 | } |
479 | ||
480 | void trace_command_performance(const char **argv) | |
481 | { | |
482 | if (!trace_want(&trace_perf_key)) | |
483 | return; | |
484 | ||
c46c406a | 485 | if (!command_line.len) |
578da039 KB |
486 | atexit(print_command_performance_atexit); |
487 | ||
488 | strbuf_reset(&command_line); | |
1fbdab21 | 489 | sq_quote_argv_pretty(&command_line, argv); |
c46c406a | 490 | trace_performance_enter(); |
578da039 | 491 | } |